gifford, operation instructions

Operating Instructions Reference: Schematics, Electrical one-line diagram, control panel CP-1 Elevation

File: Oper Instr 3-1-02 Final.doc of 112 Printed: 4/22/2004

1.0 OVERALL FUNCTION

The Waste Water Treatment Plant control system controls the pump and blower motors as well as

ultra-violet disinfection and heating equipment necessary to operate the wastewater treatment

plant. These instructions primarily cover only the electrical functionality with a description of the

control panel located at the treatment plant, CP-1, given first followed by a description of the

Remote Annunciator Panel and Remote Light Box. A thorough knowledge of the Multnomah Falls

WWTP process is needed to operate this system.

1.10 WWTP ELECTRICAL POWER OVERVIEW

The electrical power for the waste water treatment plant is derived from one of two independent

sources. The normal source of electrical power is obtained from the local utility (Cascade

Power and Light, Cascade locks OR) through the 480V, 3 PH utility transformer located outside

of the WWTP west wall. The power usage is monitored by a utility company meter on the west

wall on the outside of the building. The backup or “Emergency” source is derived from the Onan

60 KW diesel generator located in the equipment room of the WWTP building. Both of these

power sources feed into the Automatic Transfer switch, ATS-1, located on the west wall inside

the WWTP equipment room. The automatic transfer switch, ATS-1, directs the electrical power

from either the normal utility source or the emergency source to the main circuit breaker, CB-1,

in the control panel, CP-1, for distribution throughout the WWTP. Due to the design of the

automatic transfer switch both utility source and emergency source CANNOT be used at the

same time.

1.20 CP-1 480 VOLT POWER DISTRIBUTION

Multnomah Falls WWTP Operating Instructions - Continued:

The primary power distribution for the Multnomah Falls Waste Water Treatment Plant (WWTP)

is controlled through the control panel CP-1. The incoming 480V, 3 PH, 3 wire power source

from the automatic transfer switch, ATS-1, enters the control panel and feeds the main 225

amp circuit breaker, CB-1, located at the extreme right end of CP-1. CB-1 is externally

operated by the lever type operator located on the far right end of the control panel. 480 volt

power is distributed from CB-1 to a series of circuit breakers and motor circuit protectors within

control panel CP-1. The 480 volt power distribution is protected and monitored by the following

devices; lighting arrestor, LA, Transient Voltage Surge suppressor, TVSS and a phase monitor

relay, PMR-1. Each of these items along with the 480 Volt circuit breakers will be discussed in

detail in section 2.0.

1.30 CP-1 120/208 VOLT POWER DISTRIBUTION

The 120/208V, 3 Ph, 4 wire power source for CP-1 originates at a 125 amp 3 pole circuit

breaker CB-1 located in the middle of the upper section of distribution panel DP-1 in the

equipment room. This breaker is identified by the circuit numbers 38, 40 and 42. This 120/208

volt source enters the control panel and feeds the 125 amp circuit breaker CB-7 located in the

right section of CP-1. CB-7 is externally operated by the rotary type operator located in the

right door of CP-1. 120/208 volt power is distributed from CB-7 to a series of circuit breaker

and motor circuit protectors within control panel CP-1. The 120/208 power distribution is also

protected and monitored by a lighting arrestor and a phase monitor relay. Each of these items

along with power supplies, control power transformer, UPS system and “power on” indication

will be discussed in detail in section 2.0.



2.0 CONTROL PANEL CP-1 INITIAL STARTUP

This discussion assumes that 480 volt, 3 phase power is available from the automatic transfer

switch, ATS-1, to the control panel main circuit breaker, CB-1 and that CB-1 is in the off position.

With the control panel in the condition described above, plant lighting will not be operational and a

temporary light source will be required.

CAUTION

The Multnomah Fall Water Treatment Plant Control System utilizes hazardous voltages up to and

including 480 Volts AC. Any work required inside control panel CP-1 should only be performed by

qualified and competent individuals trained in the operation of the Multnomah Fall Water Treatment

Plant Control System. Working on energized electrical equipment can result in serious equipment

damage and personal injury up to and including death.

2.01 SYSTEM CHECK

The following checklist should be completed prior to energizing control panel CP-1:

2.01.01.01 Check plug connection for septic tank effluent pumps, STEP-01

and 02.

2.01.01.02 Check plug connections for septic tank level transmitters LT-1 and

LT-2. Note: These connections are located in the step vault in front

of the Multnomah Falls Lodge, in plaza area.

2.01.02 Visually inspect secondary clarifier for obstructions that would inhibit the

operation of the clarifier skimmer drive, SCO-01.



2.01.03 Inspect position of all test switches located on the lower half of the inside of

“B” bay door in control panel CP-1. Set switches to the position in the

following chart:

Test Switch Position Chart For Normal Plant Operation Schematic Line No.

Switch No.

Position Schematic Line No.

Switch No.

Position

404 TS-1 OFF 1099 TS-24 AUTO

433 TS-2 AUTO 1110 TS-25 AUTO


















1048 TS-20 AUTO 1394 TS-43 AUTO

1063 TS-21 AUTO 792 SW-1 OFF

1074 TS-22 AUTO 792 SW-2 OFF

1092 TS-23 AUTO 801 SW-3 OFF



After completing ‘test switch’ position inspection close and latch ‘B’ bay door in CP-1.

2.01.04 Inspect position of all selector switches allocated on the front of control

panel CP-1. Set switches to the position in the following table:

Selector Switch Position Chart For Initial Plant Startup Schematic Line No.

Switch No.

Position Service

228 SS-1 OFF Outside Pole Lights

235 SS-2 OFF Outside Plant Lights

421 SS-3 OFF General Audible Alarm

647 SS-4 RUN Chart Recorder

800 SS-5 OFF Aeration Blower Control

804 SS-6 LOW Aeration Blower Cycle Time

883 SS-7 OFF Aeration Blower B-01

899 SS-8 OFF Aeration Blower B-02

1011 SS-9 OFF Digester Blower DB-01

1020 SS-10 LOW Digester Blower Cycle Time

1027 SS-11 OFF Digester Blower DB-02

1139 SS-12 OFF Septic Tank Effluent Pump 01

1155 SS-13 OFF Septic Tank Effluent Pump 02

1180 SS-14 OFF Return activated Sludge Pump Control

1267 SS-15 OFF RAS-01

1283 SS-16 OFF RAS-02

1335 SS-17 OFF Digested Sludge Pump DSP-01

1361 SS-18 OFF Clarifier SCO-01

1390 SS-19 OFF Heat Trace

479 SS-20 AUTO Septic Tank Level Transmitter Select

2.01.05 Open ‘C’ Bay doors in control panel CP-1 and inspect the control fuses

located on the left side for blown fuses. Note: These fuses are equipped

with a ‘blown fuse’ indicating pin located in the top of the fuse. If a fuse is



blown, the pin indicator will pop out. Replace any fuse that indicates it s

blown with an exact replacement taking care to orient the blown fuse

indicator correctly.

2.01.06 Set the circuit breaker and motor circuit protectors located in ‘C’ Bay to the

position in the following chart:

Schematic Line No.

Breaker No. Position Voltage Service

40 CB-2 ON 480V Phase Monitor Relay PMR-1

122 CB-3 ON 480V Transformer T-1

32 CB-4 ON 480V Aeration Blower VFD-01

48 CB-5 ON 480V Aeration Blower VFD-02

112 CB-6 ON 480V Equipment Room Heater UH-1

140 CB-8 ON 208V Lightning Arrester/ 3 Phase Monitor Relay PMR-2

176 CB-9 ON 208V Heat Trace HT-1

CB-10 OFF 208V Spare

186 CB-11 ON 120V Control Panel Receptacle

191 CB-12 ON 120V UV Controller UV-01

196 CB-13 ON 120V Control Panel Strip Heaters

201 CB-14 ON 120V Control Panel Cooling Fan

226 CB-16 ON 120V Exterior Lighting

406 CB-17 ON 120V 750 VA UPS System

411 CB-18 ON 120V D.C. Power Supply PS-1

417 CB-19 ON 24 VDC D.C. Battery Backup

425 CB-20 ON 120V D.C. Power Supply PS-2

638 CB-21 ON 120V Influent Flow Transmitter FM-1

103 CB-22 ON 120V Control Power

787 CB-22A ON 120V Control Power Transformer CPT-2

788 CB-23 ON 24 VAC 24 VAC Control Power Main


Multnomah Falls WWTP Operating Instructions - Continued: 788 CB-24 ON 24 VAC Control Power Bus B

789 CB-25 ON 24 VAC Control Power Bus B1

793 CB-26 ON 24 VAC Control Power Bus B2

8 CB-27 ON 480V Lightning Arrester LA/ Surge Suppressor TVSS

727 CB-28 ON 120V Smoke Detector

14 MCP-1 ON 480V Septic Tank Pump STEP-01

23 MCP-2 ON 480V Septic Tank Pump STEP-02

58 MCP-5 ON 480V Digester Blower DB-01

67 MCP-6 ON 480V Digester Blower DB-02

76 MCP-7 ON 480V Secondary Clarifier Drive SCO-01

93 MCP-8 ON 480V Digested Sludge Pump DSP-01

147 MCP-9 ON 120V Return Activated Sludge Pump RAS-01 157 MCP-10 ON 120V Return Activated Sludge Pump RAS-02 167 MCP-11 ON 120V Waste Activated Sludge Pump WAS-01

After completing fuse inspection and setting all breakers to the position described

above close and latch ‘C’ bay doors in CP-1.

2.01.07 Locate the 120/208 distribution panel, DP-1, on the south wall of the

equipment room and position the 250 amp main breaker in the OFF

position. This breaker is located in the center of the lower section of

distribution panel DP-1. All other breakers in Panel DP-1 should be in the

ON position.

2.01.08 Check the automatic transfer switch, ATS-1, in the equipment room and

verify that the switch is in the normal position, green ‘normal’ indicator

illuminated, and ‘normal source’ is available, White ‘normal source’

indicator is illuminated.



2.01.09 Check the safety disconnects for the following equipment and insure they

are in the ‘ON’ position.

Aeration Basin Blower B-01

Aeration Basin Blower B-02

Digester Blower DB-01

Digester Blower DB-02

Secondary Clarifier Drive SCO-01

Equipment Room Heater UH-1

Each of these safety disconnect switches are located adjacent to the

associated equipment and are identified.

2.01.010 Check plug connections for the following pumps:

Digester Sludge Pump DSP-01

Return Activated Sludge Pump RAS-01

Return Activated Sludge Pump RAS-01

Waste Activated Sludge Pump WAS-01

This completes the system check and CP-1 is now ready to be energized.

2.10 ENERGIZE THE SYSTEM

With the completion of section 2.01, system check, the control panel, CP-1 and all other

plant system are ready to be energized. Check all control panel, CP-1 bay doors to insure

they are closed and securely latched. Using the lever type operator, located on the far right

end of CP-1, place circuit breaker CB-1 (Line 6) in the ‘ON’ position. This energizes the

480V, 3 PH power distribution network within CP-1 and provides power to all 480 volt

equipment through their respective circuit interrupting device. The 480 volt lighting arrestor,

LA, and transient voltage Surge suppressor, TVSS, (Lines 4-10) are now available , through



CB-27 (line 8), to provide protection to the 480 volt power system. The 480 volt phase

monitor relay, PMR-1 (line 41) is also operational through CB-2 (Line 40) to provide phase

loss and low voltage monitoring. PMR-1 provides a normally open (N.O.) contact (line 791)

which closes during normal power conditions. By-pass switch, SW-1 (line 792) is available

to by-pass the function of PMR-1 for troubleshooting only, Switch SW-1 should be in the

‘OFF’ position during normal plant operation. 480 volt power is also available, through CB-3

(Line 122), to the 480V 120/208V, 3 ph, 4wire transformer, T-1 (Line 123). This provides the

power source for distribution panel, DP-1, located in the equipment room. Locate

distribution Panel, DP-1, and place the main 250 amp breaker in the ’ON’ position. Power is

now available to all circuits fed from distribution panel DP-1 including plant interior lighting

circuits 1, 4 and 26, eliminating the need for temporary light source. 120/208 V 3 ph power

is now available form DP-1, circuit 38, 40, 42 to CP-1 circuit breaker CB-7 (Line 133). Using

the rotary type operator, located in the right door of CP-1, place CB-7 in the ‘ON’ position.

Note: Circuit breakers CB-1 and CB-7 are equipped with mechanical latch devices which

inhibit the opening of CP-1 Bay doors. This is a safety device and should not be defeated if

CB-1 or CB-7 is in the on position. With CB-7 in the ‘ON’ position power is provided to the

120/208V 3ph distribution network within CP-1 and provides power to all 120/208 Volt

equipment through their respective circuit interrupting device. The 208 volt lighting arrestor,

LA and phase monitor rely, PMR-2 (line 136-142), are now operational through CB-8 (Line

140) and provide protection and monitoring of the 120/208 volt power system. PMR-2 also

has a by-pass switch, SW-2 (line792). The Transient voltage surge suppressor, TVSS, for

the 120/208 volt system is connected through a 20 amp circuit breaker, circuits 29, 31 and

33 located in distribution panel DP-1.



2.10.01 SYSTEM CONTROL POWER 120 VOLT

Control Power transformer, CPT-1 (line 104), provides the 120 volt system control power

through a 480-120v 1 ph transformer. CPT-1 is fed 480V, 1Ph power from fuses FU-33

and FU-34 (Line 104,105). If either of these two fuses blows all control system

power is lost shutting down entire system. The 120 volt from CPT-1 feeds through

CB-22 (line 103) and supplies power to A1-N1 (line 401). This control power circuit is

equipped with a ground fault interrupter (GFI line 402) for personal and equipment ground

fault protection. The GFI device provides power for circuit A4-N2 (line 403) which

supplies CB-22A (Line 787) TS-1, (line 404) and N.O. contact C1D (line 403). The N.O.

contact C1D is operated by the phase monitor contactor, C1 (line 791) and is held closed

if the 480 volt and 120/208 volt power system satisfy the requirements of PMR-1 and

PMR-2. Test Switch TS1 (Line 404) allows power to by-pass the N.O. contact C1D for

testing. With N.O. Contact C1D held closed 120 volt power is supplied to circuit A2-N2

which feeds CB-17, (Line 406), CB-18 (Line 411), CB-20 (Line 425), Time Clock TC-1

(Line 211) and Time Clock TC-2 (Line 213).

Circuit breaker CB-17 supplies 120V power to the UPS system through a duplex

receptacle and surge protector (Line 407). The UPS system is designed to provide

continuous power to the 120 volt A3-N3 circuit (line 446), 24 VDC power supply PS-3

(Line 447), Autodialer No. 1, (line 2068) and Autodialer No. 2 (Line 2131). Power

conversion continues from the time utility power fails until the diesel generator, G-1 starts

and the automatic transfer switch, ATS-1 switches the plant load over to the generator.

Circuit breaker CB-18 supplies 120 volt power from the 24 VDC power supply PS-1 (line

411) and circuit breaker CB-20 supplies 120 volt power to the 24 VDC power supply PS-2



(Line 425). Circuit breaker CB-22A (line 787) provides power to the 120-24 VAC control

power transformer CPT-2 (line 787).

2.10.02 SYSTEM CONTROL POWER 24VDC

DC power supply PS-1 supplies a 24 VDC power source for the +1/-1 circuit that monitors

plant power and provides power failure alarms (Lines 413 thru 423). This circuit contains

power ‘ON’ indication, IL1 (Line 414), power fail relay, R1 (Line 416), battery backup and

charging circuit, (line 417), external alarm strobe light, (Line 419), external alarm horn

(line 421) and an internal alarm SonAlert (Line 423). The power fail alarm is indicated by

loss of power to relay R1, loss of power to relay R7 (Line 796) or a general alarm

condition from relay R111 (Line 1799). This circuit also has an alarm test push button

PB-1 (Line 413) and a horn silence switch SS3 (Line 421). The batteries provide power

for the strobe light and audible alarms during the period of power loss and is prevented

from back feeding the power supply by blocking diode D1 (Line 417) and N.O. contact

R1D (Line 421).

DC power supply PS-2 supplies a 24 VDC power source for the +2/-2 circuit that monitors

and alarms pump seal failure in the submersible septic tank effluent pumps, STEP PO-1

and STEP P0-2. This circuit contains power ‘ON’ indication, IL2 (Line 427), power fail

relay, R2 (Line 430), pump STEP-01 seal fail relay, R3 (Line 422), pump STEP-02 seal

fail relay, R4 (Line439) and alarm test switches TS2 (Line 433) and TS3 (Line 439). The

septic tank effluent pumps are equipment with an internal moisture sensing probe (Lines

437 and 443) which, when moisture is present energize the respective seal fail relay.

The seal fail relay R3 and R4 pick up seal fail alarm relays R77 (Line 1531), R80 (Line

1541) and indicator lights IL53 (Line 1533) and IL 55 (Line 1543). Alarm relays are



latched on by their own N.O. contacts R77A and R80A (Lines 1533 and 1443) and can

only be unlatched by depressing alarm reset PB 4 (Line 1428). These are disabled to

prevent nuisance alarm trips. If a seal fail probe senses moisture the indicator lights will

come on but not latch on. Seal fail alarm relays, R77 and R80 also generate a general

alarm condition (Lines 1714 and 1722) and a SCADA alarm (Lines 1888 and 1890).

DC power supply PS-3 supplies a 24 VDC power source for the +3/-3 circuits. This

circuit contains power ‘ON’ indication IL3 (Line 449) and power supply fail relays R5 (Line

451) and R6 (Line 453). Relays R5 and R6 generate 24 VDC power supply fail alarms if

any of the three power supplies, PS-1, PS-2 or PS-3 fails. Relay R5 provides a general

alarm condition (Line 1685) and a SCADA alarm (Line 1857). Relay R6 provides an

alarm to the remote Annunciator (Line 1838) and an Autodialer No. 1 alarm (Line 2102).

Circuit +3/-3 also provides power to the 4-20 ma analog current loops for the following

devices:

Septic Tank Level Transducer LT-1 Line 469

Septic Tank Level Transducer LT-2 Line 513

Aeration Blower B-01 Pressure Transducer PT-1 Line 550

Aeration Blower B-02 Pressure Transducer PT-2 Line 568

Digester Blower DB-01 Pressure Transducer PT-3 Line 594

Digester Blower DB-02 Pressure Transducer PT-4 Line 612

Lab Room Temp Transducer TT-1 Line 677

Equip Room Temp Transducer TT-2 Line 697

Outside Air Temperature Transducer TT-3 Line 721

2.10.03 SYSTEM CONTROL POWER 24VAC



The control power transformer CPT-2 (Line 787) supplies a 24 VAC source that is used

throughout the plant for equipment control. The 24 VAC power is distributed to three

control circuits from the main circuit breaker CB23 (Line 788). CB23 supplies power to

CB24 (Line 788), CB 25 (Line 789) and CB 26 (Line 793). Circuit breaker CB 25 provides

power to N.O. contact C1A (Line 789) and the N.O. series contact circuit PMR1 and

PMR2 (Line 791). Circuit breaker CB26 provides power to N.O. contact C1B (Line 793)

and circuit breaker CB24 provides power to N.O. contact C1C (Line 791). When the

phase monitor relays PMR1 (Line 41) and PMR2 (Line 141) are both energized, the

phase monitor contactor C1 (line 791) is energized and closes N.O. contacts C1A, C1B

and C1C which allows 24 VAC power to circuits B1-C1, B2-C2 and B-C respectively.

Each of these circuits is equipped with a power ‘ON’ indicator, IL4 (Line 797), IL 74 (Line

999), IL79 (Line 1173) and power fail relays R7 (Line 796), R115 (Line 998), and R116

(Line 1175). Power fail relay R7 provides the alarm function for all three circuits through

the series N.O. contacts R115A and R116A (Line 796). When the R7 relay de-energized

due to loss to power, it initiates the audible and visual plant alarms through the N.C.

contact R7B (line 423), remote annunciator alarm through N.C. contact R7E (Line 1838)

and the SCADA alarm N.C. contact R7C (Line 1856).

2.10.04 POWER ON LIGHTS

The CP-1 panel has indicating lights that illuminate to show if power is available on

various 120VAC and 24VDC control buses installed in the panel. Quick observation of

these lights will confirm the complete availability of the control system. Because each

light has a LED lamp that is good for 50,000 hours of operation or approx. 5.7 years of

continuous illumination, if a light is not on the most probable cause would be that the

monitored bus has lost power. Each of these lights with the buses monitored are listed in



the narrative directly above under section System Control Power 24vdc and System

Control Power 24vac.

2.11 RUN TIME METERS, OPERATION COUNTERS and GREEN, MOTOR ON LIGHT.

The 11 motors in this system are equipped with run time meters and operation counters. These

devices will automatically record the total run time in hours and the number of times each motor has

started. It is suggested that a daily log of the readings be kept. Any unusual change in the

readings should be investigated. The readings may give a good clue as to the nature of any

problems. Under automatic operation readings for each of the motors should be similar. A

substantial difference between the motors is an indication that something may not be operating

correctly.

Each motor starter has an auxiliary contact that energizes the green motor “ON” light as well as the

running time meter and the operation counter. If the motor selector switch is turned to hand and the

green light does not come on, the motor starter coil is probably burned out. There is no alarm for

this condition. This may be observed if the operation counter and running time meter on the motor

do not advance. The daily log should show this condition.

2.12 TEST SWITCHES

A total of 46 test switches are provided inside the enclosure mounted on the inside door of bay B.

The test switches are not to be used as a part of normal operation. The test switches provide the

operator with the capability to simulate the function of the components they represent. This allows

the entire system to be tested easily. Each switch is designed to simulate a specific function or

by-pass a pilot devices such as float switches, temperature switches, setpoint controllers, flow

switches, etc. These switches will be addressed individually in their respective equipment



discussions. For normal operation, test switches TS2 through TS43 should be in the A (AUTO)

position. For special purposes or emergency operation, these test switches can be moved to the C

(CLOSE) or O (OPEN) position. Also, test switch TS1 should be normally operated in the OFF

position and test switches SW1, SW2 and SW3 should be normally operated in the ON position.

Only a competent technician should operate the test switches.

2.13 PILOT LIGHTS

Normal running conditions are indicated by green and white pilot lights. A red light indicates an

alarm condition and should be checked. Green lights indicate that a motor or circuit is “ON”.

These power-on, white lights are volt meters that check both the 24VAC busses, and 24VDC

busses. These are critical to the operation of the control circuits. All white power on lights need to

be on for the control system to operate. If a power on light is Off, check the respective 24VAC or 24

VDC buss with a voltmeter. The LED lights have a 50,000 hour life and probably will not be burned

out. It is more likely that a circuit breaker has tripped in the power supply bus or the primary

breaker on the transformers. If any one of these power “ON” lights is off, the entire control system

may shut off.

2.14 START UP TIME DELAY RELAYS

Time delay relays are used to prevent all motors from turning on simultaneously after the

restoration of power due to a power outage. Time delay relays TD35, TD36, TD37 and TD38 (lines

836 through 842) are controlled solely by the presence of electrical power on bus B/C. Upon

restoration of power, each time delay relay has a unique setting that allows connected motor

circuits to energize at different times. TD35 will energize Aeration Blowers though its TD35A

contact at line 892, TD36 energizes Digester and DSP Blowers through its contacts TD36A/TD36D

at lines 1016/1335, TD37 energizes STEP pump motors and the Clarifier motor through its contacts



TD37A/TD37D at lines 1148/1361 and TD38 energizes RAS and WAS motors through its contacts

TD38A/TD38D at lines 1276/1313.

2.15 SETPOINT CONTROLLER LOOP SETUP/ CALIBRATION CHECK

Setpoint Controllers are used in the system to monitor analog instrument loop circuits and provide

not only visual indication of the monitored loops but also alarm and equipment operation setpoints.

These instruments are shown on the schematic drawings and start with setpoint controller SPC-1 at

line 455 continuing through SPC-11 line 730 for panel CP-1. A last setpoint controller also labeled

SPC-11 is found in the remote Annunciator panel at line 4262.

These controllers must be calibrated to the specific analog loop they are connected to as most of

the controllers monitor different plant parameters and all have different setpoints at which they

alarm or turn on the various equipment in the plant. The procedure for set up programming each

controller and for checking each transducer, (pressure, level, temperature, flow) is described in the

Setpoint and Calibration portion of this manual (reference outline number). In this section,

instructions for configuring each loop for testing will be given including the use of meters and the

various test points build into each instrument loop.

Each loop has removable jumpers with provision to easily connect test instruments without

disconnecting the loop transmitter. These test points are located in enclosures mounted on the

back side of B bay door on the upper most test box enclosure (box A) for panel CP-1 and the top

enclosure on the back of the Annunciator panel door. Through the use of a Rochester current

meter (signal generator) set to the 2-wire mode generating 4-20ma current for all analog loop with

the exception of the SPC-7, Influent Flow loop in which the meter generates in the source mode for

the same 4-20ma signal.

For example, the Septic Tank Level loop shown beginning with line 469 has three test points at

TP1, TP2 and TP3. Removing the jumper at TP2 and TP3 and then connecting the test meter from



TP1 to TP3 will allow the level transmitter LT-1 to be disconnected from the loop and a test signal to

be generated into the loop simulating the various analog values monitored by the setpoint controller

SPC-1.

2.15.01 Rochester Current Calibrator Operational Instructions.

Before calibration of individual loops can be performed, the following instructions on

the use of the plant Rochester CL-4002 Current calibrator must be reviewed. It

would also be helpful if the operator reviews the Rochester manual located in the

O&M manuals.

Overview. The current calibrator is a battery powered, precision test instrument that

simulates a functioning analog loop by generating a calibrated current signal into

the loop. The loop functions are then tested and calibrated as the current calibrator

can accurately and easily simulate all possible analog values provided by a

functioning loop. The instrument will be used in one of two modes: source mode or

sim (simulate) mode.

Source mode is used on instrument loops in which the process transducer provides

power to operate the loop. The influent flow meter loop (FM-1) shown on drawing

EC4, lines 638 to 651 is an example of an instrument loop that derives its operating

power from the process transducer (FM-1). This can be observed since the 4-20ma

loop is not electrically connected to the 24VDC header +3, -3 but is connected to

FM-1 which in turn is powered by 120VAC at line 638.

Sim (simulate) mode is used on circuits in which the process transducer is

powered by the loops connection to an external power source, most often a 24VDC

power supply. On the same drawing, the Digester Blower DB-01 pressure loop



shown at line 594 is an example of this type of loop as the instrument loop is

connected to the 24VDC bus +3, -3 at line 594.

Testing/ Calibrating Procedure. The following step by step instructions explain how

to use the calibrator:

Step 1) Disconnect the analog transducer from the instrument loop. For

Digester Blower DB-1, remove jumper at TP14 and TP15 and for the

Influent Flow loop, remove the jumper at TP20 and 21.

Step 2) Next connect the current calibrator such that the positive red

connection is connected to the positive test point, TP13 or TP20.

Connect the negative black instrument connection to the negative test

point, TP15 or TP19.

Step 3) After pressing the Power button on the calibrator, for Digester Blower

DB-01 loop testing, press the Sim button on the face of the meter and

for the Influent Flow loop, press the Source button. Also select either

the % or the mA readout as the meter will display either in percentage

or current value of output as described below. Push mA for current

instructional purposes.

Step 4) For either loop, next notice the reading in milliamps (mA) displayed on

the meter readout. To increase the reading, push the Up Arrow

button and to decrease, push the Down Arrow button. An alternative

procedure would be to push one of the four percent output buttons,

100%, 50%, 25% or 0% that also have the milliamp equivalent shown

(20mA, 12mA, 8mA and 4mA respectively). When one of these

buttons is pushed, the output of the calibrator will automatically adjust



to the value selected. The readout will show either a percent of

output or the current output in mA as described above.

Step 5) At this point, the output of the calibrator can increased or decreased

as required to test/ calibrate all values and functions of the analog

loop.

Step 6) After testing is complete, turn the power off, disconnect the calibrator

from the circuit and reconnect the previously removed jumpers to the

instrument loop to return the loop to operation.

The following are instructions for the calibration check for each analog loop connected in

panel CP-1 and in the remote Annunciator.

2.15.02 Septic Tank Level Controller SPC-1 (LT-1)

At line 469, disconnect LT-1 from the circuit by removing the jumper from TP2 and TP3.

Next connect the current calibrator in sim mode to TP1 and TP3. With the meter’s positive

lead connected to TP1 and its negative lead connected to TP3, generate a signal from 4 to

20ma.

Reference the setpoints given in the Calibration Procedures manual for SPC-1, observe the

digital readout shown on the face of SPC-1 and slowly increase the signal generated by the

test meter.

First observe the accuracy of the digital readout located on the face of the setpoint

controller. Run the setting on the current calibrator to a 4ma setting and compare the SPC

meter reading with the value given for parameter SL, minimum input scale. Next increase

the setting to the 20ma level and compare the Set Point Controller digital display (SPC)



reading with the parameter SH, maximum input scale. If these readings vary by more than

±0.2%, recalibrate the setpoint controller readout using the procedures found in the

Calibration Procedures manual. The set point controllers can not be calibrated if they vary

by more than 0.2% from a calibrated source current. Either the 100 ohm resistor has been

damaged by a short circuit or the controller is defective, verify range settings as described

in calibration settings table, and check 100 ohm resistor 100.00 ohms +/- 0.01%.

Next return the meter to a 4ma reading and begin increasing the signal once again. Notice

that alarm output AL1 (line 461) activates when the test signal generates a signal high

enough to correspond to the low level alarm signal, A1 in the Set Operating Parameters

chart for this controller in the Calibration Procedures manual. Continue to increase the

signal until the start lead pump contact closes (line 457) at the 1.SP value and compare

that to the value given in the same chart. Increase the signal until the high level alarm

signal, AL2 (line 460) closes and also compare that level to the value given in A2 in the Set

Operating Parameters chart. If any of the values observed on the Set Point Controller

digital display vary by more than 0.2%, check the following. The set point controllers can

not be calibrated if they vary by more than 0.2% from a calibrated source current. Either

the 100ohm resistor has been damaged by a short circuit or the controller is defective,

verify range settings as described in calibration settings table, and check 100 ohm resistor

100.00 ohms +/- 0.01%.

If the range settings are correct and the 100 ohm resistor is OK the setpoint controller is

probably defective. Replace and setup and check calibration.

After testing/ calibration of the loop is complete, return the loop to normal use by removing

the meter test leads from TP1 and TP3 and reconnecting transmitter LT-1 by connecting

the previously removed jumper to TP2 and TP3. Failure to do this will render the loop in-

operational.



2.15.03 Septic Tank Level Controller SPC-2 (LT-2)

At line 513, disconnect LT-2 from the circuit by removing the jumper from TP5and TP6.



20ma.



test meter.


controller. Run the setting on the the current calibrator to a 4ma setting and compare the

SPC meter reading with the value given for parameter SL, minimum input scale. Next

increase the setting to the 20ma level and compare the Set Point Controller digital display

(SPC) reading with the parameter SH, maximum input scale. If these readings vary by

more than ±0.2%, recalibrate the setpoint controller readout using the procedures found in

the Calibration Procedures manual. The set point controllers can not be calibrated if they

vary by more than 0.2% from a calibrated source current. Either the 100 ohm resistor has

been damaged by a short circuit or the controller is defective, verify range settings as

described in calibration settings table, and check 100 ohm resistor 100.00 ohms +/- 0.01%.





signal until the start lag pump contact closes (line 501) at the 1.SP value and compare that

to the value given in the same chart. Increase the signal until the high level alarm signal,



AL2 (line 504) closes and also compare that level to the value given in A2 in the Set

Operating Parameters chart. If any of the values observed on the Set Point Controller

digital display vary by more than 0.2%, check the following. The set point controllers can

not be calibrated if they vary by more than 0.2% from a calibrated source current. Either

the 100ohm resistor has been damaged by a short circuit or the controller is defective,

verify range settings as described in calibration settings table, and check 100 ohm resistor

100.00 ohms +/- 0.01%.






operational.

2.15.04 Aeration Blower B-01 Pressure Controller SPC-3 (PT-1)

At line 550, disconnect PT-1 from the circuit by removing the jumper from TP8 and TP9.



20ma.



test meter.















enough to correspond to the low pressure alarm signal, A1 in the Set Operating

Parameters chart for this controller in the Calibration Procedures manual. Continue to

increase the signal until the start VFD-1 contact closes (line 543) at the 1.SP value and

compare that to the value given in the same chart. Increase the signal until the high

pressure alarm signal, AL2 (line 542) closes and also compare that level to the value given

in A2 in the Set Operating Parameters chart. If any of the values observed on the Set Point

Controller digital display vary by more than 0.2%, check the following. The set point

controllers can not be calibrated if they vary by more than 0.2% from a calibrated source

current. Either the 100ohm resistor has been damaged by a short circuit or the controller is

defective, verify range settings as described in calibration settings table, and check 100

ohm resistor 100.00 ohms +/- 0.01%.




the meter test leads from TP7 and TP9 and reconnecting transmitter PT-1 by connecting




operational.

2.15.05 Aeration Blower B-02 Pressure Controller SPC-4 (PT-2)


Next connect the current calibrator in sim mode to TP10 and TP12. With the meter’s

positive lead connected to TP10 and its negative lead connected to TP12, generate a

signal from 4 to 20ma.



test meter.
















Parameters chart for this controller in the Calibration Procedures manual. Continue to

increase the signal until the start VFD-2 contact closes (line 561) at the 1.SP value and

compare that to the value given in the same chart. Increase the signal until the high

pressure alarm signal, AL2 (line 560) closes and also compare that level to the value given

for A2 in the Set Operating Parameters chart. If any of the values observed on the Set

Point Controller digital display vary by more than 0.2%, check the following. The set point










operational.



2.15.06 Digester Blower DB-01 Pressure Controller SPC-5 (PT-3)







test meter.














Parameters chart for this controller in the Calibration Procedures manual. Increase the

signal until the high pressure alarm signal, AL2 (line 586) closes and also compare that

level to the value given for A2 in the Set Operating Parameters chart. If any of the values



observed on the Set Point Controller digital display vary by more than 0.2%, check the

following. The set point controllers can not be calibrated if they vary by more than 0.2%

from a calibrated source current. Either the 100ohm resistor has been damaged by a short

circuit or the controller is defective, verify range settings as described in calibration settings

table, and check 100 ohm resistor 100.00 ohms +/- 0.01%.






operational.

2.15.07 Digester Blower DB-02 Pressure Controller SPC-6 (PT-4)







test meter.

















signal until the high pressure alarm signal, AL2 (line 604) closes and also compare that












operational.



2.15.08 Influent Flow Controller SPC-7 (FM-1)

At line 642, disconnect FM-1 from the circuit by removing the jumper from TP20 and TP21.

Next connect a test meter in source mode (simulates a 2-wire transmitter in source mode)

to TP19 and TP20. With the meter’s positive lead connected to TP20 and its negative lead

connected to TP19, generate a signal from 4 to 20ma.



test meter.













enough to correspond to the low flow alarm signal, A1 in the Set Operating Parameters

chart for this controller in the Calibration Procedures manual. Increase the signal until the

high flow alarm signal, AL2 (line 630) closes and also compare that level to the value given

for A2 in the Set Operating Parameters chart. If any of the values observed on the Set



Point Controller digital display vary by more than 0.2%, check the following. The set point








the meter test leads from TP19 and TP20 and reconnecting transmitter FM-1 by connecting


operational.

2.15.09 Lab Room Temperature Controller SPC-8 (TT-1)

At line 677, disconnect TT-1 from the circuit by removing the jumper from TP23 and TP24.

Next connect a test meter in 2-wire mode to TP22 and TP24. With the meter’s positive

lead connected to TP22 and its negative lead connected to TP24, generate a signal from 4

to 20ma.



test meter.















enough to correspond to the low temperature alarm signal, A1 in the Set Operating


signal until the high temperature alarm signal, AL2 (line 668) closes and also compare that










the meter test leads from TP22 and TP24 and reconnecting transmitter TT-1 by connecting


operational.



2.15.10 Equipment Room Temperature Controller SPC-9 (TT-2)




to 20ma.



test meter.













enough to correspond to the low temperature alarm signal, A1 in the Set Operating


signal until the high temperature alarm signal, AL2 (line 688) closes and also compare that














operational.

2.15.11 Outside Air Temperature Controller SPC-10 (TT-3)




to 20ma.

Reference the setpoints given in the Calibration Procedures manual for SPC-10, observe

the digital readout shown on the face of SPC-10 and slowly increase the signal generated

by the test meter.














that control output SPC-10 (line 709) activates when the test signal generates a signal high

enough to correspond to the heat tape on signal, 1.SP in the Set Operating Parameters

chart for this controller in the Calibration Procedures manual. If any of the values observed

on the Set Point Controller digital display vary by more than 0.2%, check the following. The

set point controllers can not be calibrated if they vary by more than 0.2% from a calibrated

source current. Either the 100ohm resistor has been damaged by a short circuit or the

controller is defective, verify range settings as described in calibration settings table, and

check 100 ohm resistor 100.00 ohms +/- 0.01%.






operational.



2.15.12 Ultra-Violet (UV) Intensity Controller SPC-11 (UV Controller)

At line 765, disconnect the UV Controller from the circuit by removing the jumper from

TP35 and TP36. Next connect a test meter in 2-wire mode to TP34 and TP36. With the

meter’s positive lead connected to TP34 and its negative lead connected to TP36, generate

a signal from 4 to 20ma.



by the test meter.








vary by more than 0.2% from a calibrated source current. Either the 100ohm resistor has






the meter test leads from TP34 and TP36 and reconnecting the UV Controller transmitter

by connecting the previously removed jumper to TP35 and TP36. Failure to do this will

render the loop in-operational.



USFS to add discussion of test points TP-31,32,33 for checking signal to samplers, on EC-

4.

2.15.13 Water Tank Level Controller SPC-11 (LT-3)

In the remote Annunciator panel at line 4279, disconnect LT-3 from the circuit by removing

the jumper from TP2 and TP3. Next connect the current calibrator in sim mode to TP1 and

TP3. With the meter’s positive lead connected to TP1 and its negative lead connected to

TP3, generate a signal from 4 to 20ma.



by the test meter.

















signal until the output contact closes (line 4264) at the 1.SP value and compare that to the

value given in the same chart. Increase the signal until the high level alarm signal, AL2

(line 4267) closes and also compare that level to the value given for A2 in the Set

Operating Parameters chart. If these readings vary by more than ±0.2%, recalibrate the

setpoint controller readout using the procedures found in the Calibration Procedures

manual. The set point controllers can not be calibrated if they vary by more than 0.2% from

a calibrated source current. Either the 100ohm resistor has been damaged by a short








operational.

2.20 SEPTIC TANK EFFLUENT PUMPS - STEP-01 & STEP-02

2.21 Step-01 and Step-02 Overview

The primary controls for the AUTO operation of both Step-01 and Step-02 are the analog level

transducers LT-1 and LT-2. These transducers are located in the Septic tank vault on the east end

of the MF Plaza and both provide a 4-20 ma signal to selector switch SS20 (line 479). Selector

switch SS20 enables the analog signals from LT-1 and LT-2 to be directed to either or both set

point controller SPC-1 or SPC-2. In the “AUTO” position, the analog 4-20 ma signal from level



transducers LT-1 and LT-2 (lines 476/520) are applied directly to set point controller SPC-1 and

SPC-2 (lines 457/458/501/502) respectively. In the “LT-1” position the analog signal from LT-1 is

applied to both setpoint controllers SPC-1 and SPC-2. Likewise if SS20 is in the “LT-2” position,

the analog signal from LT-2 is applied to both controllers. The LT-1 and LT-2 analog signals are

protected from transient voltages by DSP-1 through DSP-4 (lines 471/476/514/519). Test points

are provided for testing and calibration of the analog loop. Reference the above instructions on

how to use test points TP1 through TP6 in testing and calibration of these analog circuits.

The set point controllers in turn are connected to relays R23 (line 1048) and R24 (line 1063) with

the relays connected directly to the motor starter circuits at lines 1146 and 1148. Test switches

TS20/TS21 for relays R23/R24 (lines 1048/1063) are provided for maintenance and

troubleshooting. With the test switch in the “A” position, the system functions normally. By placing

the test switch in the “O” position the functions of the associated relay is disabled. In the “C”

position the test switch forces the relay into the energized state. Selector Switches SS12 (line

1139) and SS13 (line 1155) provide HAND/OFF/AUTO mode selection and motor circuit protectors

MCP-1 and MCP-2 along with motor starters M1 and M2 complete the basic control system for both

motors.

2.22 Step-01 and Step-02 Auto Mode Operation

With selector switches SS12 (line 1140) and SS13 (line 1156) in the AUTO position, the lead pump

(as controlled by SPC-1) will first turn on followed by the lag pump (controlled by SPC-2) if the level

continues to rise to the preset level after the lead pump has turned on. Depending on the last

position of the alternator relay RA3 (line 1148), either STEP-01 or STEP-02 will turn on with SPC-1

(RA3 contacts at lines 1146 through 1150) followed by the remaining pump if called by SPC-2

through the contacts of R24D at line 1147. Pumps STEP-01 and STEP-02 will continue to run until

the septic tank level falls below the set points of their respective controller.



Note: When calibrating the setpoint controllers (SPC-1 and SPC-2) for these motors, it is important

to ensure that no conflict exists between the setpoints for lead and standby on/off values.

Reference the chart Set Operating Parameters for both controllers in the Setup and Calibration

manual. The On setpoint for the Lead and lag pumps are shown on the charts at the 1.SP value.

The Off for both controllers is given in the H value and is subtracted from the On value. For

example, if the On value for the Lead pump is 5.00 feet (1.SP) and the Off value is .5 feet (H), then

the Lead pump will turn on at 5 feet and off at 4.5 feet.

Ensure that the off value of the Lag pump controller is not so large that it does not shut the Lag

pump off before the Lead pump is turned off. A good rule of thumb is to ensure that the H value of

the Lag controller is equal to or less than the H value of the Lead controller.

If LT-1, SPC-1 or R23 fails, R24 will turn on when the level in the tank reaches the predetermined

high level set point of SPC-2. If R24 turns on with the failure of lead pump controls, both Step

pump motors will start simultaneously when R24A/R24D (lines 1146/1147) close.

In addition, if the lead pump control has not cycled within the on time delay (2-60min.) set on the

repeat cycle timer TD17 (line 1074), the timer will time out and start the lead pump when contact

TD17A (line 1150) closes. The motor will run until the off time delay (2-60min) of TD17 times out

and turns off the contact at line 1150. Test switch TS22 (line 1074) for relay TD17 is provided to

allow normal operation, position “A”, disable TD17, position “O”, or forcing TD17 into the energized

state, position “C”.

The pumps will shut down if they are running and there is a low level in the tank (R25C at line 1148)

as determined by SPC-1/SPC-2 alarm contacts AL-1 (lines 1092/1095) energizing R25 (line 1092).

Contact R25A (line 1516) enables the low level alarm relays R71, R72, and indicator IL50 (lines

1515/1516/1517). These remain energized until reset by PB4 (line 1428). Remote indication and

Autodialer No. 1 input is provided by R71A and R71D (lines 1829/2085). CP-1 general alarm and



SCADA input are initiated by R72D (line 1708) and R72F (line 1885). High level tank condition is

alarmed through SPC-1/ (line 1099). Contact R26A enables high level alarm relays R73, R74, and

indicator IL51 (lines 1519/1521/1523), remaining energized until reset by PB4. Remote indication

and Autodialer No. 1 input is provided by R73A and R73D (lines 1828/2083). CP-1 general alarm

and SCADA input are initiated by R74D (line 1710) and R74F (line 1886). Test switches

TS23/TS24 (lines 1092/1099) are provided for R25/R26 testing. Switch position “A” allows normal

operation, position ”O” disables relay function, and position “C” forces alarm condition.

Also, with both selector switches SS12 and SS13 in AUTO, a motor circuit protector breaker

opening or a motor overload tripping will cause the affected motor to shut down and the other motor

to run if running conditions are called for by SPC-1 or SPC-2. This occurs when either R28 (line

1134) or R30 (line 1162) de-energizes causing contacts R28A (line 1139) or R30A (line 1155) to

open and turn off the faulted motor and contacts R28E/R30E (lines 1143/1153) to close and turn on

the standby motor. Relays R27, R28, R29 and R30 (lines 1132/1134/1160/1162) provide the

following alarm functions; SCADA input (R28C line 1863 and R30C line 1864), local alarm

indication IL13/IL15 (R27B line 1131/R29B line 1864), CP-1 general alarm (R27C line 1758 and

R29C line 1760).

The last feature of the AUTO controls occurs if a low effluent flow is detected by the flow transducer

FM-1 that sends a 4-20ma signal to SPC-7. If SPC-7 detects a low flow condition and either TD18

(line 1110) or TD19 (line 1118) time out, contacts R75A or R78A (lines 1145 or 1151) close forcing

both step pumps into the run condition through the jumpers around contacts R75B and R78B (lines

1144/1152).

2.23 Step-01 and Step-02 Hand Mode Operation

With the selector switches in the HAND position, each pump will run without regard to the level

transducers in the tank. Pump motors will stop when in HAND only if the overload or breaker trip



detect an unsafe condition and relay contacts R28A (line 1139) and R30A (line 1155) open. Care

should be exercised when operating a pump in HAND so that the pump does not operate dry.

2.30 AERATION BASIN BLOWERS – B-01 & B-02

2.31 B-01 & B-02 Overview

The primary control for the AUTO operation of both B-01 and B-02 is relay R8 (line 800) which is

energized either by time clock TC-1 (lines 804, 805 or 806) or a computer (line 802) through the

selected position of selector switches SS5 and SS6. Time clock TC-1 is provided with 6 individual

time dials, A through F, that makes one complete revolution per 24 hours. Dials A, B, & C

correspond to the LO, MED, and HI cycle times selected by SS6. The blower on – blower off cycle

time can be adjusted, in 15min increments, with the tabs on the time dial. With the tab rotated in

toward the center of the dial the blower will turn on, with the tab rotated outward the blower will be

off. In addition, a blower can be run continuously through a setting on SS5. R8 is connected

directly to the motor starter circuits at line 892. Selector Switches SS7 (line 883) and SS8 (line 899)

provide HAND/OFF/AUTO mode selection and circuit breakers CB-4 and CB-5 along with relays

R21 which controls VFD-01 and R22 controlling VFD-02 complete the basic hardwired control

system for both motors.

Blower speed by pressure control

Other control features for Aeration Blowers No.1 and No.2 are located in the setpoint controllers

SPC-3 and SPC-4. When run in Auto, the speed of the VFD drives are run according to the amount

of pressure detected by PT-1 for VFD-1 (B-01) and PT-2 for VFD-2 (B-02). If either pressure

transmitter detects a pressure that is decreasing in value, the output from the controller will increase

causing the VFD to run the blower motor faster. The speed of the motor is increased until the

pressure sensed by the setpoint controller equals the setpoint value entered in the controller’s



memory. Conversely, a pressure reading greater than the setpoint will cause the output signal to

decrease and slow the motor down until the setpoint is reached.

Blower speed manual control

If this automatic function is not working (e.g., pressure transmitter has faulted or if constant speed

operation is desired), the setpoint controllers can be operated in Manual mode. To select Manual

from Auto, push the A/M keypad located on the left of the face of the controller. If the controller is in

Auto, it will switch to Manual and if in Manual, will switch to Auto. Once operating in Manual mode,

the operator must use the up and down arrow keypads located across the bottom of the controller

to increase and decrease the output of the controller and thus change the output of the VFD’s and

consequently the speed of the motors.

2.32 B-01 & B-02 Auto Mode Operation

With selector switches SS7 and SS8 in the AUTO position, a blower motor will run after R8 is

energized by either the time clock, computer or with SS5 in CONT. position (lines 800 through 806).

Depending on the last position of the alternator relay RA1 (line 892), either B-01 or B-02 will turn on

(RA1 contacts at lines 890 through 894) due to a run signal sent to VFD-01 or VFD-02 by the

closing of contacts R21A (line 886) or R22A (line 901). The motor will continue to run until R8A

opens, a fault occurs or the motor is turned off by SS7 or SS8.

A circuit breaker opening or a VFD fault (lines 876/904) will cause the affected motor to shut down

and the other motor to run if running conditions are called for by R8. This occurs when either R12

or R14 de-energizes causing contacts at lines 883 or 899 to open and turn off the faulted motor and

contacts at lines 887 or 897 to close and turn on the standby motor. The VFD continuously

monitors itself and the connected motor load for proper operation. If a drive or motor circuit

condition should arise exceeding the preset limits of the drive parameters a fault message is



displayed and the drive will trip. The following is a partial list of the most common faults that will

stop drive operation:

2 OVER TEMP 7 UNDER LOAD 24 GND FAULT

3 MOT STALL 8 OVER CURRENT

4 MOTOR TEMP 9 OVER VOLT

These faults are reset by pressing the fault reset on the drive. If the fault has been cleared the

drive will resume operation.

WARNING

The drive will start immediately after fault reset is pushed if the start command is present.

For a complete discussion of drive faults refer to ABB publication ACH 501-04F Installation & Start-

up Manual Chapter 5.

The last feature of the AUTO controls occurs if a blower failure alarm is detected by relay R53 (line

1442) and R58 (line 1462). If flow switches FS1/FS2 detect low flow (TD1/TD5 lines 811/844), set

point controllers SPC-3/SPC-4 (line 537/555) alarm contacts Pressure transmitter PT-1 for B-01,

PT-2 for B-02 located next to blowers in equipment room, AL-1 detects low blower discharge

pressure (TD2/TD6 lines 815/848) or alarm contacts AL-2 high blower discharge pressure

(TD3/TD7 line 820/853), or temperature switches TS1/TS2 detect high discharge air temperatures

(TD4/TD8 lines 826/860), contacts R53A/R53B (lines 888/889) or contacts R58A/R58B (lines

895/896) change position causing the standby blower to start and run after the respective time

delay relay times out. Test switches TS4 through TS11 are provided for each failure alarm relay,

TD1 through TD8. Switch position “A” allows normal operation, position “O” disables alarm

function, and position “C” forces circuit into alarm condition.



Note: V8 series is for blowers B01/2, V6 series is for blowers DB01/02 and is a custom trimmed

vane.

USFS to add info on V6/V8 switches on application

2.35 B-01 & B-02 Hand Mode Operation

With the selector switches in the HAND position, each blower will run without regard to the controls

provided through R8. Blower motors will stop when in HAND only if the VFD Fault or breaker trip

detect an unsafe condition and relay contacts R12A (line 883) and R14A (line 899) open.

2.40 DIGESTER BLOWERS – DB-01 & DB-02

2.41 DB-01 & DB-02 Overview

The primary control for the AUTO operation of both DB-01 and DB-02 is time clock TC-1 and SS10

(lines 1020 through 1022). This is the same time clock described in section 2.31. Time dials D, E,

and F correspond to the LO, MED, and HIGH cycle times selected by SS10. The on-off cycle time

is adjusted in the same manner as previously discussed for blowers B010 and 02 above. Selector

Switches SS9 (line 1011) and SS11 (line 1027) provide HAND/OFF/AUTO mode selection and

motor circuit protector breakers MCP-5 and MCP-6 along with motor starters M5 and M6 complete

the basic control system for both motors.

2.42 DB-01 & DB-02 Auto Mode Operation

With selector switches SS9 and SS11 in the AUTO position, the selected period of timed operation

is chosen through the position of SS10 (LOW/ MEDIUM/ HIGH) and the motors will run as per the

settings on time clock TC-1 contacts TC1D, TC1E or TC1F. Depending on the last position of the

alternator relay RA2 (line 1020), either DB-01 or DB-02 will turn on (RA2 contacts at lines 1018



through 1022) due to a run signal sent to M5 or M6. The motor will continue to run until TC1D,

TC1E or TC1F opens, a fault occurs or the motor is turned off by SS9 or SS11.

A motor circuit protector breaker opening or a motor starter overload tripping will cause the affected

motor to shut down and the other motor to run if running conditions are called for by TC-1. This

occurs when either R18 or R20 de-energizes causing contacts at lines 1011 or 1027 to open and

turn off the faulted motor and contacts at lines 1015 or 1025 to close and turn on the standby motor.

The last feature of the AUTO controls occurs if a blower failure alarm is detected by relay R63 (line

1484) and R68 (line 1499). If flow switches FS3/FS4 detect low flow (TD11/TD15 lines 944/988),

set point controllers SPC-5/SPC-6 (lines 587/605) alarm contacts AL-1 PT-3 for DB01, pressure

transmitters located next to Digester blowers, PT-4 for DB-02 detect low blower discharge pressure

(TD9/TD13 lines 930/974) or alarm contacts AL-2 high blower discharge pressure (TD10/TD14 lines

937/981) or temperature switches TS3/TS4 detect high discharge air temperature (TD12/TD16 lines

951/995), contacts R63A/R63B (lines 1016/1017) or contacts R68A/R68B (lines 1023/1024) change

position causing the standby blower to start and run after the respective time delay relay times out.

Test switches TS12 through TS19 are provided for each failure alarm relay, TD9 through TD16.

Switch position “A” allows normal operation, position “O” disables alarm function, and position “C”

forces circuit into alarm condition.

2.45 DB-01 & DB-02 Hand Mode Operation

With the selector switches in the HAND position, each blower will run without regard to the controls

provided through TC-1 and SS10. Blower motors will stop when in HAND only if the overload or

breaker trip detect an unsafe condition and relay contacts R18A (line 1011) and R20A (line 1027)

open.



2.50 SECONDARY CLARIFIER DRIVE – SCO-01

2.51 SCO-1 Overview

The primary control for the operation of SCO-1 is provided by SS18 (line 1361). Motor circuit

protector breaker MCP-7 along with motor starter M7 completes the basic control system for the

motor.

2.52 SCO-1 ON Operation

With selector switch SS18 in the ON position, M7 will be energized and the drive motor will run and

continue to run unless a fault occurs or SS18 is turned to the OFF position.

An over-torque condition on the arm of SCO-1 will cause the over-torque limit switch (line 1361) to

change position and de-energize M7 turning off the drive motor. There are two torque limit switches

in the SCO-1 drive housing. The second limit switch (line1360) is set at a lower torque value than

the switch on line 1361 and will energize TD29 (line 1359) which alarms after it is timed out. If the

torque rises above this alarm value the second switch set at the higher torque value will shut off M7

shutting off SCO-1 motor.

A motor circuit protector breaker opening or a motor starter overload tripping will cause the motor to

shut down. This occurs if R44 (line 1353) de-energizes causing contacts at lines 1361 to open and

turn off the motor starter.

2.60 DIGESTED SLUDGE PUMP – DSP-01

2.61 DSP-01 Overview

The primary control for the operation of DSP-01 is provided by SS17 (line 1335) and the remote

start/stop station. Motor circuit protector breaker MCP-8 along with motor starter M8 completes the

basic control system for the motor.



2.62 DSP-01 HAND Operation

With selector switch SS17 in the HAND position, M8 will be energized and the drive motor will run

and continue to run unless a fault occurs or SS17 is turned to the OFF position.

In HAND operation, a low-level alarm will de-energize M8 when TD28 (line 1344) de-energizes and

TD28A opens (line 1335). Also, a motor circuit protector breaker opening or a motor starter

overload tripping will cause the motor to shut down. This occurs if R41 (line 1326) de-energizes

causing its contact at line 1335 to open and turn off the motor.

2.63 DSP-01 REMOTE Operation

With selector switch SS17 in the REMOTE position and the start pushbutton in the remote start/stop

station is pushed, M8 will be energized and the pump motor will run and continue to run unless a

fault occurs or SS17 is turned to the OFF position or the stop pushbutton is pushed in the remote

station. In addition, M8 will de-energize if allowed to run until the single shot timer TD27 (line 1331)

times out and opens its TD27A contact (line 1337).

In REMOTE operation, a low-level alarm (LS-13 in DSP wetwell) will de-energize M8 when TD28

(line 1344) de-energizes and TD28A opens (line 1335).

The overload/ breaker trip feature of the DSP-01 control consists of a normally open MCP-8

contact, normally closed OL-8 contact and relay R41 all on line 1326. Relay R41 is normally

energized. If the motor circuit protector MCP-8 trips due to a high current or is opened by hand, if

the motor overload contact OL-8 senses a high motor current and opens, relay R41 will de-energize

and open its contact R41A on line 1335 causing the DSP-01 motor starter M8 to de-energize and

stop the DSP-01 pump motor. Relay R41 also alarms when it de-energizes as described in the

alarm description section in this instruction. In addition, to recover from this alarm and reset MCP-8

or OL-8, reference the section Alarm Resetting Procedures in this instruction.



2.70 RETURNED ACTIVATED SLUDGE PUMPS – RAS-01 & RAS-02

2.71 RAS-01 & RAS-02 Overview

The primary control for the AUTO operation of both RAS-01 and RAS-02 is time clock TC-2 (line

213), computer (through R122 line 1177) and SS14 (line 1180). Time clock TC-2 is provided with 6

individual time dials, A through F, that makes one complete revolution per 24 hours. Dial A is used

for the on-off cycle control of the RAS pumps. Dials B through F are not used. The on-off cycle

time is adjusted, in 15-min increments, with the tabs on the time dial. Rotating the tab toward the

center of the dial turns the circuit on while rotating the tab outward turns the circuit off. Selector

Switches SS15 (line 1267) and SS16 (line 1283) provide HAND/OFF/AUTO mode selection and

motor circuit protector breakers MCP-9 and MCP-10 along with motor starters M9 and M10

complete the basic control system for both motors.

2.72 RAS-01 & RAS-02 Auto Mode Operation

With selector switches SS15 and SS16 in the AUTO position, a pump motor will run after energized

by either the time clock or computer when SS14 is in the TIME CLOCK or COMP position (lines

1180 through 1182). Depending on the last position of the alternator relay RA4 (line 1276), either

RAS-01 or RAS-02 will turn on (RA4 contacts at lines 1274 through 1278) due to a run signal sent

to M9 or M10. The motor will continue to run until either TC2A or the computer (through R122A)

contacts open, a fault occurs or the motor is turned off by SS15 or SS16 or is shut off by RAS

wetwell low level cutout / restore switches LS-9 or LS-10 in RAS pump chambers. See O & M

spreadsheet for weir calibration spreadsheet curves.

A circuit breaker opening or a motor starter overload tripping will cause the affected motor to shut

down and the other motor to run if running conditions are called for by either the time clock or

computer. This occurs when either R36 or R38 de-energizes causing contacts at lines 1267 or



1283 to open and turn off the faulted motor and R36A line 1267, R38A line 1283, contacts at lines

1271 or 1281 to close and turn on the standby motor.

Another feature of the AUTO controls is if level switches LS-9/LS-10 detect a low level causing

relays R33/R34 to energize, contacts R33B/R34B (lines 1268/1284) open causing the affected

pump to stop.

The last feature of the AUTO controls occurs if a flow fail alarm is detected by relay R84 (line 1559)

and R87 (line 1568). If the level switch LS-7 detects a low splitter box level (TD21/TD22 lines

1198/1204) and the affected motor is running, contacts R84B/R84A (lines 1272/1273) or contacts

R87A/R87B (lines 1279/1280) change position causing the standby RAS Pump to start and run.

2.73 RAS-01 & RAS-02 Hand Mode Operation

With the selector switches in the HAND position, each pump motor will run without regard to the

controls provided through TC-2, the computer and SS14. Pump motors will stop when in HAND

only if the overload or breaker trip detect an unsafe condition and relay contacts R36A (line 1267)

and R38A (line 1283) open.

2.80 WASTE ACTIVATED SLUDGE PUMP – WAS-01

2.81 WAS-01 Overview

The primary control for the operation of WAS-01 is provided by PB2 and PB3 (line 1313). Motor

circuit protector breaker MCP-11 along with motor starter M11 completes the basic control system

for the motor.

2.82 WAS-01 START Operation

When PB3 is pushed, M11 will be energized and the drive motor will run and continue to run unless

time delay TD-25 delay times out, a motor fault MCP-11/ OL-11 (line 1305) occurs de-energizing



relay R39 (line 1305) and opening contact R39A (line 1313), the low level cutout/restore switch LS-

12 opens (Line 1320) or the stop button PB2 (line 1313) is pushed. When M11 contact line 1307

energizes single shot time delay relay TD25 on line 1311, TD25A contact seals around pushbutton

PB3 causing pump to stay on until time delay relay TD25 times out and opens TD25A which shuts

off WAS pump. Test switch TS33 is provided for disabling or testing the low level cutout logic.

The overload/ breaker trip feature of the WAS-01 control consists of a normally open MCP-11

contact, normally closed OL-11 contact and relay R39 all on line 1305. Relay R39 is normally

energized. If the motor circuit protector MCP-11 trips due to a high current or is opened by hand, if

the motor overload contact OL-11 senses a high motor current and opens, relay R39 will de-

energize and open its contact R39A on line 1313 causing the WAS-01 motor starter M11 to de-

energize and stop the WAS-01 pump motor. Relay R39 also alarms when it de-energizes as

described in the alarm description section in this instruction. In addition, to recover from this alarm,

reference the section Alarm Resetting Procedures in this instruction.

2.90 ALARMS OVERVIEW

A number of alarms are provided that will sound an alarm and shut down part of the system. See

schematic drawing lines 1428 through 1677. Alarm conditions are annunciated on the door face of

CP-1 through audible (horn/buzzer) and visual alarms (strobe light/red indicating lights) and also at

the Remote Annunciator Panel/Remote Light Box (lines 1826 through 1845), the Scada Panel (lines

1856 through 1924 and Autodialers No.1 & No.2 (lines 2071 through 2178).

The alarms are "sealed in" so that after an alarm has occurred, if the condition corrects itself, the

alarm indication will still be present until the alarm reset push-button (PB4 line 1428) is momentarily

depressed. Note that in the event of a MCP or motor overload trip condition, the MCP or O.L. must

be manually reset inside CP-1 before the alarm condition will reset.



2.91 Alarm Resetting Procedures

After the alarm condition has cleared, some alarm devices must be mechanically “reset” by the

operator before the affected system can resume operation. All alarms must be electrically reset by

pushing the Alarm Reset pushbutton, PB4 (line 1428).

The following is a narrative of the procedures required to reset all alarms.

2.91.0 Motor Overloads - If a motor overload device senses an out of range motor current,

the unit will “trip” and disconnect the motor starter from its control circuit thus de-energizing

the motor and stopping the motor from overheating before it is damaged. Once the overload

“trips”, it will remain in the tripped condition preventing the motor from starting until the

overload unit is “reset” by pushing the reset button mounted in the face of each motor starter

enclosure within CP-1. A tripped condition will be noticed when depressing the reset button in

that when pushing on the button, some resistance will be noticed. On a unit that has not

tripped, no resistance will be noticed when the button is depressed.

After an overload unit has tripped due to a motor overload condition and before depressing

the reset button, the motor needs to be checked to ensure that it hasn’t been damaged. Using

the Digester Blower motor DB-01 (line 58) as an example, after opening the supply circuit

breaker MCP-5 use the high voltage range (500 volts or more) on a multi-meter and ensure

that power has been disconnected from each motor supply conductor by reading the potential

difference between each conductor (5M1, 5M2 and 5M3) and between each conductor and

ground. After ensuring no power is present on the supply conductors, use the lowest scale

resistance setting on the meter and measure the resistance of each motor lead at terminals

5T1, 5T2 and 5T3 measuring from 5T1 to 5T2, from 5T1 to 5T3 and last from 5T2 to 5T3. The

amount of resistance will vary from approx. 10 ohms or somewhat higher for small motors to 5



ohms or less for larger motors. If any resistance reading is 0 ohms, the motor is most likely

shorted and will have to be replaced. If any resistance reading is extremely high the motor

has an open wire that will have to be repaired. Also read from each of the motor leads to a

ground connection using a high resistance scale of 1 meg ohm or more. If the reading is

50,000 ohms or less, the insulation on the motor windings are most likely damaged and the

motor will have to be replaced.

After taking the readings as described directly above, visually inspect the motor if possible. If

the motor is extremely hot and especially if a noxious burnt smell is observed the motor is

most likely damaged and must be replaced.

If the motor passes all inspections and readings, ensure that the multi-meter is removed from

any connection to the power circuit and re-energize the circuit by closing circuit breaker MCP-

5. Connect the fluke current probe on the motor leads one at a time and measure motor

running current in each phase after reset button on overload is reset or MCP is reset.

Compare this to the full load amps listed in the O&M spreadsheet under MOTOR DATA

SHEETS. On the face of the motor starter, depress the reset button and if tripped, a small

click will be felt in the button and also possibly heard. This click will indicate that the overload

device was tripped and has been reset. It is possible that if the overload device has just

tripped, depressing the reset button will not reset the device as not enough time has elapsed

to cause the device to cool and reset. If this condition is observed, wait a short period of time

(5 to 10 minutes) and depress the reset button once again. The 2nd attempt should reset the

overload device.

After the overload device is reset, the motor starter will once again energize and run the motor

if the motor is required to run by the control circuit connected to it.



2.91.1 Circuit Breakers - If a circuit breaker senses an out of range current that is greater

than its trip rating, the breaker will “trip” to the mid-position (the middle between Open and

Closed) and disconnect the circuit thus stopping current from flowing before the circuit and/or

connected devices are damaged. Once the circuit breaker “trips”, it will remain in the tripped

condition preventing the circuit from energizing until the circuit breaker is “reset” by first

pushing the breaker to Open and then back to Closed. Note: some circuit breakers may have

a manual reset that requires pushing the reset button on the face of the breaker before the

breaker can be reclosed.

However, similar to the resetting of motor overloads in the narrative directly above, caution

must be used before resetting the breaker. As in the narrative above for overloads, use the

high voltage range (500 volts or more) on a multi-meter for 480vac circuits and a lower range

for 120vac circuits (250 volts) and ensure that power has been disconnected from each circuit

conductor by reading the potential difference between each conductor and between each

conductor and ground. If all voltage has been removed from all conductors, next read from

each of the connected circuit conductors to a ground connection using a high resistance scale

of 1 meg ohm or more. If the reading is 50,000 ohms or less, the insulation in the circuit or

one of the connected components is likely damaged and must be disconnected from the

circuit before the breaker can be reset and closed.

Some circuit breakers may have to cool for a short period of time before they can be reset. As

in the narrative for resetting motor overloads, if when attempting to push the breaker handle to

the Open position the handle will not stay in the Open position, allow the breaker from 5 to 10

minutes to cool before attempting to reset it once again. The 2nd attempt should be

successful.



2.91.2 Other Devices – Other devices such as the UPS, Emergency Generator, UV

Controller, etc. should be investigated as to the nature of their alarm before enabling the

equipment for use once again. Reference the affected system Owner Instruction Manual for

procedures to be performed when the equipment experiences an alarm condition.

WARNING

Opening control panel CP-1 while energized exposes personnel to live electrical circuits up to and

including 480 volts. Contact with energized electrical equipment could cause severe equipment

damage and/or personal injury up to and including death.

A general alarm strobe light and horn will be sounded any time an alarm occurs (R111A line 421).

The alarm horn (both on the panel and external) can be silenced by moving the horn off selector

switch (SS3 line421) to the OFF position. The backup battery (line 417) will supply power to the

horn and light in the event of a power failure.

2.92 Alarm Descriptions

The following is a narrative of the alarms connected to and generated by the components within

panel CP-1.

2.92.0 Battery Backup External Site Alarms – A Battery Backup External Site alarm system

is provided for with a Strobe Light and Alarm Horn mounted on the east exterior wall of the

maintenance building. The system annunciates General and Bus Failure alarms to personnel

working outside the maintenance building. The controls to operate this system are shown at

lines 417 through 423. The operation of this circuit was previously described above in this

narrative under section 2.10.02, System Control Power 24vdc and is additionally explained in

the Functional Description under the section Battery Backup External Site Alarms.



2.92.1 AC (24VAC) Power Failure Alarm – Relay R7 (line 796) is turned off by the opening

contact R115A (BUS B1/C1, R115 at line 998) or R116A (Bus B2/C2, R116 at line 1175) or by

the loss of 24VAC power from CPT-2 (Bus B/C line 788). R7B enables the external plant

strobe, horn, and CP-1 SonAlert (lines 419, 421, 423), the Remote Annunciator Panel R7E (line

1838) and at Scada R7C (line 1856).

2.92.2 Aeration Basin No. 1 High Level Alarm – R89/R90 (lines 1576/1578) are energized by

TD23A which is activated by the coil of TD23 at line 1235 after the delay period times out when

LS-1 (line 1235) closes due to a high level condition. This alarm is annunciated by R90D at the

CP-1 General Alarm (line 1738) by R89D at the remote Annunciator Panel (line 1832) and by

R90F for Scada (line 1897) & R89A for the Autodialer No. 1.

2.92.3 Aeration Basin No. 2 High Level Alarm – R91/R92 (lines 1583/1585) are energized by

TD24A which is activated by the coil of TD24 at line 1242 after the delay period times out when

LS-2 (line 1242) closes due to a high level condition. This alarm is annunciated by R92D at the

CP-1 General Alarm (line 1740) by R91D remote Annunciator Panel (line 1833) and by R92F for

Scada (line 1898) & R91A for the Autodialer No.1.

2.92.4 Aeration Blower B-01 High Pressure Alarm – R51 (line 1434) is energized by TD3D

which is activated by the coil of TD3 at line 820 after the delay period times out when SPC-3

alarm contact AL-2 (line 820) closes due to a high pressure condition, when blower is running

(879). This alarm is annunciated by R51D at the CP-1 General Alarm (line 1689) and by R51F

for Scada (line 1872).

2.92.5 Aeration Blower B-02 High Pressure Alarm – R56 (line 1454) is energized by TD7D


alarm contact AL-2 (line 853) closes due to a high pressure condition, when blower is running



(907). This alarm is annunciated by R56D at the CP-1 General Alarm (line 1695) and by R56F


2.92.6 Aeration Blower B-01 High Temperature Alarm – R52 (line 1438) is energized by

TD4D which is activated by the coil of TD4 at line 826 after the delay period times out when TS1

closes due to a high temperature condition. This alarm is annunciated by R52D at the CP-1

General Alarm (line 1691) and by R52F for Scada (line 1873).

2.92.7 Aeration Blower B-02 High Temperature Alarm – R57 (line 1458) is energized by

TD8D which is activated by the coil of TD8 at line 860 after the delay period times out when TS-

2 closes due to a high temperature condition. This alarm is annunciated by R57D at the CP-1

General Alarm (line 1697) and by R57F for Scada (line 1877).

2.92.8 Aeration Blower B-01 Low Flow Alarm – R50 (line 1428) is energized by TD1D which

is activated by the coil of TD1 at line 811 after the delay period times out when FS1 closes due

to a low flow condition when blower is running (line 879). This alarm is annunciated by R50D at

the CP-1 General Alarm (line 1687) and by R50F for Scada (line 1871).

2.92.9 Aeration Blower B-02 Low Flow Alarm – R55 (line 1450) is energized by TD5D which

is activated by the coil of TD5 at line 844 after the delay period times out when FS2 closes due

to a low flow condition when blower is running (line 907). This alarm is annunciated by R55D at

the CP-1 General Alarm (line 1693) and by R55F for Scada (line 1875).

2.92.10 Aeration Blower B-01 Low Pressure Alarm – R54 (line 1446) is energized by TD2D


alarm contact AL-1 (line 815) closes due to a low pressure condition when blower is running

(line 879). This alarm is annunciated by R54D at the CP-1 General Alarm (line 1786) and by

R54F for Scada (line 1874).



2.92.11 Aeration Blower B-02 Low Pressure Alarm – R59 (line 1466) is energized by TD6D


alarm contact AL-1 (line 848) closes due to a low pressure condition when blower is running

(line 907). This alarm is annunciated by R59D at he CP-1 General Alarm (line 1788) and by

R59F for Scada (line 1878).

2.92.12 Aerobic Digester No. 1 High Level Alarm – R97/R98 (lines 1606/1609) are energized

by TD31A which is activated by the coil of TD31 at line 1373 after the delay period times out

after LS-5 closes due to a digester high level condition. This alarm is annunciated by R98D at

the CP-1 General Alarm (line 1746) by R97A for the Autodialer No. 1 (liner 2127) and by R98F


2.92.13 Aerobic Digester No. 2 High Level Alarm – R99/R100 (lines 1613/1615) are energized

by TD32A which is activated by the coil of TD32 at line 1380 after the delay period times out

after LS-6 closes due to a digester high level condition. This alarm is annunciated by R100D at

the CP-1 General Alarm (line 1748) by R99A for the Autodialer No. 1 (line 2135) and by R100F


2.92.14 ATS Transferred Alarm – R109/R110 (lines 1658/1660) and IL71 (line 1662) are

energized by an ATS Auxiliary contact at line 1660 after the transfer switch shifts. This alarm is

annunciated by R110D at the CP-1 General Alarm (line 1790), by R109A for the remote

Annunciator Panel (line 1837), by R109D for the Autodialer No. 1 (line 2100) and by R110F for

Scada (line 1910).

2.92.15 Blower Fail Alarm – R70 (line 1507) is energized by any one of the individual blower

failed alarms, Aeration Blower No. 1 (R53F, line 1505), Aeration Blower No. 2 (R58F, line

1507), Digester Blower DB-01 (R63F, line 1509) or Digester Blower DB-02 (R68F, line 1511).



This alarm is annunciated by R70A at the remote Annunciator Panel (line 1831) and by R70D at

the Autodialer No. 1 (line 2092).

Relay R53 (line 1442) is energized by contact R9A (line 1442) which is closed when relay R9

(line 833) energizes due to the contact closure of either TD3A (line 831), TD1A (line 833), TD4A

(line 835), R11E (line 837) or TD2A (line 839). These contacts are in turn closed when any of

the various Aeration Blower B-01 faults occur, TD1 (line 811) Blower B-01 Low Flow, TD2 (line

815) Blower B-01 Low Pressure, TD3 (line 830) Blower B-01 High Pressure, TD4 (line 826)

Blower B-01 High Temperature and R11 (line 876) Blower B-01 VFD Fault. The functional

description for time delay relays TD 1 through TD4 and relay R11 was given in the Aeration

Blower B-01 functional description in the above narrative. Also, relay R53 contacts R53A and

R53B (lines 888 & 889) were discussed at the same location.


(line 865) energizes due to the contact closure of either TD7A (line 863), TD5A (line 844), TD8A

(line 860), R13E (line 904) or TD6A (line 848). These contacts are in turn closed when any of

the various Aeration Blower B-02 faults occur, TD5 (line 844) Blower B-02 Low Flow, TD6 (line

848) Blower B-02 Low Pressure, TD7 (line 853) Blower B-02 High Pressure, TD8 (line 860)

Blower B-02 High Temperature and R13 (line 904) Blower B-02 VFD Fault. The functional

description for time delay relays TD5 through TD8 and relay R13 was given in the Aeration

Blower B-02 functional description in the above narrative. Also, relay R58 contacts R53A and

R53B (lines 895 & 896) were discussed at the same location.


(line 918) energizes due to the contact closure of either TD9A (line 916), TD10A (line 937),

TD12A (line 951), R17E (line 1004) or TD11A (line 944). These contacts are in turn closed

when any of the various Digester Blower B-01 faults occur, TD9 (line 930) Blower DB-01 Low



Pressure, TD10 (line 937) Blower DB-01 High Pressure, TD11 (line 944) Blower DB-01 Low

Flow, TD12 (line 951) Blower DB-01 High Temperature and R17 (line 1004) Blower DB-01

Overload. The functional description for time delay relays TD9 through TD12 and relay R17

was given in the Digester Blower DB-01 functional description in the above narrative. Also,

relay R63 contacts R63A and R63B (lines 1017 & 1016) were discussed at the same location.


(line 962) energizes due to the contact closure of either TD13A (line 960), TD14A (line 981),

TD16A (line 995), R19E (line 1032) or TD15A (line 988). These contacts are in turn closed

when any of the various Digester Blower B-02 faults occur, TD13 (line 974) Blower DB-02 Low

Pressure, TD14 (line 981) Blower DB-02 High Pressure, TD15 (line 988) Blower DB-02 Low

Flow, TD16 (line 995) Blower DB-02 High Temperature and R19 (line 1032) Blower DB-02

Overload. The functional description for time delay relays TD13 through TD16 and relay R19

was given in the Digester Blower DB-02 functional description in the above narrative. Also,

relay R68 contacts R68A and R68B (lines 1023 & 1024) were discussed at the same location.

2.92.16 B-01 OL/BT Alarm – Aeration Blower B-01 VFD Fault/Breaker Tripped alarm is turned

on by R11/R12 (line 876/877) if CB-4 opens or if VFD-01 fault trips. This alarm is annunciated

by R11C at the CP-1 General Alarm (line 1762) and by R12C at Scada (line 1859).

2.92.17 B-02 OL/BT Alarm – Aeration Blower B-02 VFD Fault/Breaker Tripped alarm is turned

on by R13/R14 (line 904/905) if CB-5 opens or if VFD-02 Fault trips. This alarm is annunciated

by R13C at the CP-1 General Alarm (line 1764) and by R14C at Scada (line 1860).

2.92.18 Clarifier High Level Alarm – R95/R96 (lines 1600/1602) are energized by TD30A which

is activated by the coil of TD30 at line 1366 after the delay period times out when LS-3 closes

due to a Clarifier high level condition. This alarm is annunciated by R96D at the CP-1 General

Alarm (line 1744) by R96F at Scada (line 1901) and by R95A at the Autodialer No. 1 (line 2096).



2.92.19 DC (24VDC) Power Failure Alarm – Relays R5/R6 (lines 451/453) are turned off by the

opening of contacts R2A or R1A (line 451) or by the loss of DC power supply PS-3 (line 450).

This alarm is annunciated by R5B at the CP-1 General Alarm (line 1685), by R6C at the Remote

Annunciator Panel (line 1838), by R5C at Scada (line 1857) and by R6B at the Autodialer No. 1

(line 2102).

2.92.20 DB-01 OL/BT Alarm – Digester blower DB-01 Overload/Breaker Tripped alarm is turned

on by R17/R18 (lines 1004/1006) if MCP-5 opens or if OL-5 overloads trip. This alarm is

annunciated by R17C at the CP-1 General Alarm (line 1768) and by R18C at Scada (line 1861).

2.92.21 DB-02 OL/BT Alarm – Digester Blower DB-02 Overload/Breaker Tripped alarm is turned

on by R19/R20 (lines 1032/1034) if MCP-6 opens or if OL-6 overload trips. This alarm is

annunciated by R19C at the CP-1 General Alarm (line 1774) and by R20C at Scada (line 1862).

2.92.22 DSP-01 OL/BT Alarm – Digester Sludge Pump DSP-01 Overload/Breaker Tripped

alarm is turned on by R41 (line 1326) if MCP-8 opens or if OL-8 overload trips. This alarm is

annunciated by R41C at the CP-1 General Alarm (line 1778) and by R41E at Scada (line 1870).

2.92.23 DSP-01 Wetwell Low Level Alarm – Digested Sludge Wetwell low level alarm relays

R106/R107 (lines 1644/1646) are energized by TD28A which is activated by the coil of TD28 at

line 1344 after the delay period times out after LS-13 (line 1346) closes due to a digested

sludge wetwell high level condition. This alarm is annunciated by R107D at the CP-1 General

Alarm (line 1752) by R106D at the Autodialer No. 1 (line2141) and by R106F at Scada (line

1896).

2.92.24 Digester Blower DB-01 High Alarm – R61 (line 1475) is energized by TD10D which is

activated by the coil of TD10 at line 937 after the delay period times out when SPC-5 alarm

contact AL-2 (line 937) closes due to a high pressure condition, when blower is running (line



1007). This alarm is annunciated by R61D at the CP-1 General Alarm (line 1699) and by R61F

at Scada (line 1880).

2.92.25 Digester Blower DB-02 High Pressure Alarm – R66 (line 1490) is energized by

TD14D which is activated by the coil of TD14 at line 981 after the delay period times out when

SPC-6 alarm contact AL-2 (line 981) closes due to a high pressure condition, when blower is

running (line 1035). This alarm is annunciated by R66D at the CP-1 General Alarm (line 1703)

and by R66F at Scada (line 1883).

2.92.26 Digester Blower DB-01 High Temperature Alarm – R62 (line 1478) is energized by

TD12D which is activated by the coil of TD12 at line 951 after the delay period times out

whenTS-3 closes due to a high temperature condition. This alarm is annunciated by R62D at

the CP-1 General Alarm (line 1701) and by R62F at Scada (line 1881).

2.92.27 Digester Blower DB-02 High Temperature Alarm – R67 (line 1493) is energized by

TD16D which is activated by the coil of TD16 at line 995 after the delay period times out when

TS-4 closes due to a high temperature condition. This alarm is annunciated by R67D at the

CP-1 General Alarm (line 1706) and by R67F at Scada (line 1884).

2.92.28 Digester Blower DB-01 Low Flow Alarm – R64 (line 1481) is energized by TD11D

which is activated by the coil of TD11 at line 944 after the delay period times out when FS-3

closes due to a low flow condition, when blower is running (line 1007). This alarm is

annunciated by R64D at the CP-1 General Alarm (line 1792) and by R64F at Scada (line 1921).

2.92.29 Digester Blower DB-02 Low Flow Alarm – R69 (line 1496) is energized by TD15D

which is activated by the coil of TD15 at line 988 after the delay period times out when FS-4

closes due to a low flow condition, when blower is running (line1035). This alarm is

annunciated by R69D at the CP-1 General Alarm (line 1794) and by R69F at Scada (line 1922).



2.92.30 Digester Blower DB-01 Low Pressure Alarm – R60 (line 1472) is energized by TD9D


alarm contact AL-1 (line 930) closes due to a low pressure condition, when blower is running


R60F at Scada (line 1879).

2.92.31 Digester Blower DB-02 Low Pressure Alarm – R65 (line 1487) is energized by TD13D


alarm contact AL-1 (line 974) closes due to a low pressure condition, when blower is running


R65F at Scada (line 1882).

2.92.32 Equipment Room High Temperature Alarm – R124 (line 1654) is energized by SPC-9

alarm contact AL-2 (line 1653) due to a high temperature condition in the Equipment Room.

This alarm is annunciated by R124A at the CP-1 General alarm (line 1798) by R124D at Scada

(line 1924) and by R124F at the Autodialer No. 2 (line 2150).

2.92.33 General Alarm CP-1 – Relay R111 (line 1799) is energized by contacts as indicated

from line 1685 through line 1798. This alarm is annunciated by R111A at the CP-1 Panel (line

421) by R111D at the remote Annunciator Panel (line 1841) and by R111F at the Autodialer No.

1 (line 2115).

2.92.34 Heat Tape HT-01 BT Alarm - HT-01 Breaker Tripped alarm is turned on by R121 (line

177) if CB-9 opens, R121A de-energizes relay coil R45 (line 1388). This alarm is annunciated

by R45C at the CP-1 General Alarm (line 1766) and by R45E at Scada (line 1869).

2.92.35 Generator Running – When the Emergency Generator is running, generator controls

close a contact (line 1415) shown as relay RR1 line 2031 and 2034 located in the control panel

mounted on the generator set. If toggle switch TS 40 is in the A position, relay R48 (line 1415)



will energize along with Generator Running indicating light IL33 (line 1417). Contact R48D (line

1830) closes to provide an alarm to the Annunciator Panel, contact R48F closes to annunciate

to Scada and contact R48A (line 2090) closes to annunciate the alarm to the Autodialer No. 1.

It should be noted that the Generator Running alarm is not included with the General Alarms. It

should also be noted that this is not an alarm in the truest sense of the word as the Generator

may be running only because of a test or for maintenance purposes.

2.92.36 Generator Failed – The Generator Failed alarm is unique from other alarms connected

to the alarm system. The contacts for this alarm are controlled by relay RA1 found in the

Generator control panel as indicated on lines 2029, 2033, 2183 and 2177. However, the only

remote method of annunciation for the alarm is through the Autodialer No. 2 as shown on lines

2183 and 2177. The alarm is on only as long as it is generated by the Generator control panel.

2.92.37 Lab Building Fire Alarm – R125 (line 1675) is energized by a smoke detector in the

Lab Building. This alarm is annunciated by R125A at the remote Annunciator (line 1840) and

by R125D at the Autodialer No. 1 (line 2113).

2.92.38 Lab Building High Temperature Alarm – R123 (line 1651) is energized by SPC-8

alarm contact AL-2 (line 1650) or SPC-8 alarm contact AL-1 (line 1652), due to a high

temperature condition in the Lab Building. This alarm is annunciated by R123A at the CP-1

General Alarm (line 1796), by R123D at Scada (line 1923) and by R123F at the Autodialer No. 1

(line 2143).

2.92.39 Lab Building Intrusion Alarm – TD40 (line 1677) is energized by an intruder at either

door switch No. 1 or by door switch No. 2 in the Lab Building. This alarm is annunciated by

TD40D at the remote Annunciator Panel (line 1839) and by TD40A at the Autodialer No. 1 (line

2104). The Key Switch shown on line 1680 is used to prevent a false Intrusion alarm from

being sent when authorized personnel enter the administration building. The switch is located



in a box mounted to the right of the main entry door on the south side of the building. The

switch must be turned to the Off position before TD40 (line 1677) times out once Door Switches

No.1 and No.2 located at each entry door have closed due to an opened door.

2.92.40 Return Activated Sludge Pump RAS-01 Flow Failed Alarm –Relay R83/84 (lines

1557/1559) are energized by TD21A when pump RAS-01 is in the run condition, M9A (line

1263) closed providing power to contact R32A (line 1198), level switch LS-7 closes energizing

relay R32 (line 1189) which closes R32A energizing time delay relay TD21 (line 1198) closing

contact TD21A (line 1559) after the delay period times out. This alarm is annunciated by R83A

at the CP-a General Alarm (line 1730), by R83F at Scada (line 1892), and by R84F at the

Autodialer No. 1 (line 2119).

2.92.41 Return Activated Sludge Pump RAS-01 Wetwell Low Level Alarm – Relay R85 (line

1563) is energized by R33D which is activated by the coil of R33 at line 1220 if LS-9 closes due

to a low level condition. This alarm is annunciated by R85D at the CP-1 General Alarm (line

1732) and by R85F at Scada (line 1893).

2.92.42 Return Activated Sludge Pump RAS-02 Flow Failed Alarm – Relays R86/87 (lines

1566/1568) are energized by TD22A when pump RAS-02 is in the run condition, M10A (line

1292) closed providing power to contact R32D (line 1204), level switch LS-7 closes energizing

relay R32 (line 1189) which closes R32D energizing time delay relay TD22 (line 1204) closing

contact TD22A (line 1568) after the delay period times out. When relay R86 is energized, it

closes contact R86D (line 1734) to turn on a General alarm and contact R86F (line 1894) to

send an alarm to Scada. When relay R87 energizes, contact R87F (line 2121) closes to

annunciate to the Autodialer No. 1.

2.92.43 Return Activated Sludge Pump RAS-02 Wetwell Low Level Alarm – Relay R88 (line

1572) is energized by R34D which is activated by the coil of R34 at line 1227 if LS-10 closes



due to a low level condition. This alarm is annunciated by R88D at the CP-1 General Alarm

(line 1736) and by R88F at Scada (line 1895).

2.92.44 Return Activated Sludge Pumps RAS-01 & RAS-02 Failed Alarm – Relay R112 (line

1666) is energized by R83D (line 1664, Ras Pump Ras-01 Low Flow Alarm), R86D (line 1666,

Ras Pump Ras-02 Low Flow Alarm), R35E (line 1668, Ras Pump Ras-01 OL/BT alarm) and

R37E (line 1672, Ras Pump Ras-02 OL/BT Alarm). This alarm is annunciated by R112D at the

remote Annunciator Panel (line 1835).

2.92.45 Secondary Clarifier SCO-01 Over Torque Alarm – Relays R93/94 (lines 1590/1592)

are energized by TD29A which is activated by the coil of TD29 (line 1359) after the delay period

times out if the over torque limit switch (line 1361) closes due to an over torque condition. This

alarm is annunciated by R94D at the CP-1 General Alarm (line 1742) by R93A at the remote

Annunciator (line 1834) by R94F at Scada (line 1900) and by R93D at the Autodialer No. 1 (line

2094).

2.92.46 SCO-01 OL/BT Alarm – Secondary Clarifier SCO-01 Overload/Breaker Tripped alarm is

enabled by relay R44 (line 1353) if MCP-7 opens or if OL-7 overload trips. This alarm is

annunciated by R44C at the CP-1 General alarm (line 1776) and by R44E at Scada (line 1868).

2.92.47 Septic Tank High Level Alarm – Relays R73/74 (lines 1519/1521) are energized by

R26A which is activated by the coil of R26 (line 1099) if the high level contact AL-2 on SPC-1

(line 1099) or high level contact AL-2 on SPC-2 (line 1102) closes due to a high level condition.

This alarm is annunciated by R74D at the CP-1 General Alarm (line 1710) by R73A at the

remote Annunciator (line 1828) by R74F at Scada (line 1886) and by R73D at the Autodialer

No. 1 (line 2083).

2.92.48 Septic Tank Low Level Alarm – Relays R71/72 (lines 1515/1516) are energized by

R25A which is activated by the coil of R25 (line 1092) if the high level contact AL-1 on SPC-1



(line 1092) or low level contact AL-1 on SPC-2 (line 1095) closes due to a low-level condition.

This alarm is annunciated by R72D at the CP-1 General Alarm (line 1708) by R71A at the

remote Annunciator (line 1829) by R72F at Scada (line 1885) and by R71D at the Autodialer

No. 1 (line 2085).

2.92.49 Septic Tank Effluent Pump STEP-01 Flow Failed Alarm – Relays R75/76 (lines

1525/1527) are energized by TD18A when pump STEP-01 is in the run condition, M1A (line

1136) is closed providing power to contact R31A (line 1110), SPC-7 alarm contact AL-1 closes

energizing relay R31 (line 1106) which closes R31A energizing time delay relay TD18 (line

1110) closing contact TD18A (line 1527) after the delay period times out. This alarm is

annunciated by R76D at the CP-1 General Alarm (line 1712) by R75F at the remote Annunciator

Panel (line 1826) by R76F at Scada (line 1887) and by R75D at the Autodialer No. 1 (line 2079).

2.92.50 Septic Tank Effluent Pump STEP-02 Flow Failed Alarm – Relays R78/79 (lines

1535/1537) are energized by TD19A when pump STEP-02 is in the run condition, M2A (line

1164) is closed providing power to contact R31D (line 1118), SPC-7 alarm contact AL-1 closes

energizing relay R31 (line 1106) which closes R31D energizing time delay relay TD19 (line

1118) closing contact TD19A (line 1537) after the delay period times out. This alarm is

annunciated by R79D at the CP-1 General Alarm (line 1716) by R78F at the remote Annunciator

Panel (line 1827) by R79F at Scada (line 1889) and by R78D at the Autodialer No. 1 (line 2081).

2.92.51 Septic Tank Effluent Pumps STEP-01 & STEP-02 Flow Failed Alarm – Relays

R81/82 (lines 1545/1547) are energized by TD20A which is activated by the coil of TD20 (line

1125) when auxiliary motor starter contacts M1C and M2C (line 1125) are closed (both pumps

running) and if the flow failed contact AL-2 on SPC-7 (line 1125) closes due a flow failed

condition. This alarm is annunciated by R82D at the CP-1 General Alarm (line 1724) by R82F

at Scada (line 1891) and by R81D at the Autodialer No. 1 (line 2117).



2.92.52 Septic Tank Effluent Pump STEP-01 Seal Failed Alarm – Relay R77 (line 1531) is

energized by R3A which is activated by the coil of R3 (line 433) if the moisture probe for pump

STEP-01 senses moisture in the motor due to a failed motor seal. This alarm is annunciated by

R77D at the CP-1 General Alarm (line 1714) and by R77F at Scada (line 1888).

2.92.53 Septic Tank Effluent Pump STEP-02 Seal Failed Alarm – Relay R80 (line 1541) is

energized by R4A which is activated by the coil of R4 (line 439) if the moisture probe for pump

STEP-02 senses moisture in the motor due to a failed motor seal. This alarm is annunciated by

R80D at the CP-1 General Alarm (line 1722) and by R80F at Scada (line 1890).

2.92.54 STEP-01 OL/BT Alarm – Septic Tank Effluent Pump STEP-01 Overload/Breaker

Tripped alarm is turned on by R27/28 (lines 1132/1134) if MCP-1 opens or if OL-1 overload

trips. This alarm is annunciated by R27C at the CP-1 General Alarm (line 1758) and by R28C


2.92.55 STEP-02 OL/BT Alarm – Septic Tank Effluent Pump STEP-02 Overload/Breaker

Tripped alarm is turned on by R29/30 (lines 1160/1162) if MCP-2 opens or if OL-2 overload

trips. This alarm is annunciated by R29C at the CP-1 General Alarm (line 1760) and by R30C


2.92.56 Waste Activated Sludge Wetwell Level Low Alarm – When low level switch LS-12

(line 1320) opens time delay relay TD26 (line 1318) de-energizes closing contact TD26C (line

1634) which energizes relays R105/113 (lines 1634/1632) enabling the WAS wetwell low level

alarm. This alarm is annunciated by R105D at the CP-1 General Alarm (line 1750 by R105F at

Scada (line 1906) and by R113A at the Autodialer No. 1 (line 2139).

2.92.57 WAS-01 OL/BT Alarm – Waste Activated Sludge Pump WAS-01 Overload/ Breaker

Tripped alarm is turned on by R39 (line 1305) if MCP-11 opens or OL-11 overload trips. This



alarm is annunciated by R39C at the CP-1 General Alarm (line 1784) and by R39E at Scada

(line 1867).

2.92.58 Ultra Violet High Level Alarm – Relays R101/102 (lines 1620/1622) are energized by

TD33A which is activated by the coil of TD33 (line 1404) if the level switch LS-4 closes due to a

high level condition. This alarm is annunciated by R102D at the CP-1 General Alarm (line

1756), by R102F at Scada (line 1904) and by R101A at the Autodialer No. 2 (line 2137).

2.92.59 Ultra Violet System Fail Alarm – Relays R103/104 (lines 1626/1628) are energized by

TD39B which is activated by the coil of TD39 (line 1400) if CB-12 or if contact R47B opens due

to an Ultra-Violet Major alarm (UV System Fail alarm at UV cabinet) contact closure (line 1410).

This alarm is annunciated by R104D at the CP-1 General Alarm (line 1754), by R104F at Scada

(line 1905), by R103D at the Autodialer No. 1 (line 2098) and by R103A at the annunciator (line

1836).

2.100 ELECTRICAL POWER SURGE PROTECTION

2.101 Surge Protection Overview - Transient Voltage Surge Suppressors and Lightning

Arrestors are connected to the electrical distribution system to provide protection for

connected equipment against power surges and spikes that can occur in the power supply

system. At lines 4 & 8 and at line 136, two Lighting Arresters (LA) and one transient voltage

surge suppressor (TVSS) are shown. When high voltage spikes and surges due to lightning

strikes or other equipment connected elsewhere in the electrical distribution system occur,

components mounted within the Lightning Arrestors and TVSS absorb the high energy levels

of the spike or surge and reduce the voltage to a level that will not damage connected

equipment.

Surge protection equipment is located in CP-1 in D bay in the upper left hand corner and

mounted next to Lighting Panel LP-1 in the Equipment Room.



2.102 Surge Protection Operation– The surge protection equipment requires no maintenance or

operational adjustments, etc. under normal conditions. However, there are green LED

indicating lights located on the equipment that show the state of internal components. If any

of these internal components are damaged due to spikes or surges, the equipment must be

replaced to ensure continued protection for connected equipment. If the LED lights on the

front of the surge protector enclosure are lit, the internal components are working properly. If

one or more of the lights are not lit and power is available to the surge protector, the unit is

faulty and must be replaced. For additional information, reference the Maintenance Manual,

16900 sec 2.16 and 2.17.

2.110 CP-1 ENCLOSURE HEATING and COOLING SYSTEM

2.111 Heating and Cooling Overview - Panel CP-1 has an installed heating and cooling

system to maintain internal enclosure temperature within a predetermined range to keep

temperatures from either decreasing too low or increasing too high.

2.112 Heating System - Two strip heaters (line 196) are installed that are controlled by a

thermostat mounted on the left side panel in Bay C. The heating circuit is connected to circuit

breaker CB-13. The thermostat is set to turn the heaters on at temperatures lower than

approx. 50ºF.

2.113 Cooling System - A ventilation fan (line 202) is installed that is controlled by a

thermostat mounted on the left side panel in Bay C. The cooling circuit is connected to circuit

breaker CB-14. The thermostat is set to turn the fan on at temperatures higher than approx.

90ºF.

2.120 HEAT TAPE HT-1



2.121 Heat Tape Overview - The Off-On selector switch SS19 at line 1390 controls heat Tape

contactor (C2). When the selector switch is on, the Heat Tape contactor will energize when

ambient air temperature drops and either a thermostat or outside ambient air temperature

controller close their respective contacts. Indicating lights show operational status and

abnormal conditions are alarmed. Normal operation of SS1 is in On mode.

The primarily controller for the Heat Tape is by setpoint controller SPC-10 from the outside

temperature transmitter TT-3. The mechanical room (Honeywell thermostat located adjacent

to the floor mount transformer) thermostat is a backup controller. The setpoint of the

thermostat is such that SPC-10 will turn the Heat Tape contactor on first on falling ambient air

temperatures. If SPC-1 fails to turn the Heat Tape contactor on, the thermostat at line 1390

will energize the contactor after the temperature decreases past the setpoint of SPC-10.

2.122 Heat Tape HT-1 Off Operation - With selector switch SS19 (line 1390) in OFF, power is

denied to contactor coil C2. The contactor coil will be de-energized and the Heat Tape will

shut off.

2.123 Heat Tape HT-1 On Operation - With R45A contact closed, selector switch SS19 in ON

(line 1390) and either the Heat Tape Thermostat (line 1390) closed and/or contact R42A (line

1392) closed, power is supplied to contactor coil C2 turning on the Heat Tape (lines 176, 178).

When Heat Tape contactor C2 energizes, it closes contacts at line 1396 to turn on light IL32

on CP-1 indicating that the Heat Tape is on. In addition, a signal is also sent to Scada.

As noted above in the Heat Tape system description, setpoint controller SPC-10 (line 708) via

R42 is the primary control from outside temperature sensor TT-3. SPC-10 will energize Heat

Tape contactor C2 during falling ambient temperatures before the mechanical room

thermostat contacts close. The thermostat in the mechanical room in parallel with R42A



contact is a backup controller that has a setpoint that turns the Heat Tape contactor on at a

lower temperature than does SPC-10 through relay R42.

Contact R45A will close if the coil of R45 (line 1388) is energized through contact R121A (line

1388) which indicates that CB-9 is closed (line 176) supplying power to the heat tape. If there

is a breaker trip, R45 will de-energize causing R45A (line 1390) to open and de-energize C2

and R45B (line 1387) to close and turn on the breaker trip light IL31. R45C (line 1766) will

close turning on the general alarm and R45E (line 1869) will close to send an alarm signal

back to Scada.

2.124 Heat Tape GFI Circuit Breaker and Heat Tape Testing - To test the Heat Tape ground

fault circuit breaker (CB-9), push the amber test push button located on the face of the

breaker on the lower left corner and continue to hold to allow for any time delay provided in

the breaker trip function. After the button is pushed and after the required time delay occurs,

the breaker will trip to the mid-position if it is functioning correctly. After the circuit breaker

trips, it can be reset by releasing the test button and turning the breaker completely off and

then back on.

Faulty heat tapes will most likely be detected by a tripped (handle at mid-position) CB-9 circuit

breaker. To test the heat tape and confirm a faulted condition, first turn off the Heat Tape GFI

circuit breaker (CB-9). After the breaker is verified off and with Heat Tape contactor C2 (line

1390) turned off (SS9 in the Off position), use a voltage tester to ensure no electrical power is

still being applied to the heat tape by placing one test probe on terminal 2H9C at line 176 and

the other probe on a ground connection in CP-1. Test the other circuit terminal with a probe

on 2H9D at line 178 and the other probe to ground. The normal circuit voltage is 208vac with

approx. 110vac to ground. With circuit breaker CB-9 and switch SS9 open, both voltage

tester readings should read 0vac to ground.



If the circuit voltage is 0vac and with disconnect switches at lines 176 and 182 closed, use a

megohmmeter with a 0 to 2500vdc range and test as per the following manufacturer’s

instructions:

Manufacturer’s Test Instructions: Insulation resistance testing (with a megohmmeter)

should be conducted at three voltages: 500, 1000, and 2500vdc. Significant problems may go

undetected if testing is done only at 500 or 1000 volts.

Figure 1 - Measuring the Cable Insulation Resistance

Test A: Inner Dielectric Jacket Integrity Test. Measure the resistance between the heating-cable

bus wires and the braid at all three voltages, as indicated in the steps below.

Test B: Outer Jacket Integrity Test. Measure the insulation resistance between the braid and the

metal pipe at all three voltages, as indicated in the steps below.

Procedure: 1. Disconnect power to the circuit and lock out power to the thermostat, if installed.

2. Disconnect the power connection at the junction box.

3. Connect the negative ( – ) lead to the heating-cable metallic braid.



4a. Connect the positive ( + ) lead to both heating-cable bus wires simultaneously.

4b. Connect the positive ( + ) lead to metallic pipe.

5. Turn on the megohmmeter and set the voltage to 500vdc; apply the voltage for 1 minute. Record the insulation resistance in the Inspection Record (see Appendix).

6. Repeat Step 5 at 1000 and 2500vdc.

7. Turn off the megohmmeter.

8. Discharge phase connections to ground with a suitable grounding rod if the megohmmeter does not self-discharge. Disconnect the megohmmeter.

9. Reconnect the heating cable if it passes.

If, after performing the above tests, the Heat Trace system passes these tests but will not operate

properly, reference the manufacturer’s instruction manual for additional instructions.

2.130 ULTRA-VIOLET DISINFECTION SYSTEM

2.131 UV System Overview - The Ultra-Violet Disinfection System runs continuously when its

power supply circuit breaker (CB-12, Line 191) is closed and the UV unit is turned on at the

unit. The system is monitored for UV equipment failure, for failure of its power supply circuit

breaker, CB-12 and also for a high water level condition in the UV channel. If an UV Major

alarm occurs (UV System Fail alarm, line 1410), the run time meter TRM14 (line 1406)

records the amount of time the alarm was active. Also, the number of times the UV Major

alarm occurs is recorded on operation counter OC14 (line 1407). Reference additional

discussion of UV High Level and UV System Fail alarms found in the Alarm Narrative section

that follows.

2.132 UV Intensity Analog Loop - The UV Intensity level is also monitored by the Autodialer No.

2, a chart recorder and the UV Setpoint Controller SPC-11. The UV Controller (line 772)

outputs a 4-20ma analog signal that measures the intensity of the UV level from 0-14mw/cm2.

The 4-20ma signal is connected to a chart recorder REC-2 (line 773) to provide a record of



the level of intensity. The signal is also connected to the Autodialer No. 2 (line 765) for

remote monitoring purposes and to the UV Intensity setpoint controller SPC-11 (line 732) for

local display purposes. In addition, a selector switch SS21 (line 765) is connected in parallel

with the chart recorder input to allow removal of the chart recorder from the analog loop

leaving the loop in operation. Placing the switch in the Bypass position shorts out the chart

recorder and allows the loop to function while the recorder is being serviced. After the

recorder is back in service, the selector switch must be returned to the Run position.

2.133 UV System Alarms

2.133.0 Ultra Violet High Level Alarm – This alarm activates when float switch LS-4 (line

1404) closes due to a high water level in the UV channel. The alarm is reset when the

level returns to normal. This alarm is annunciated as a CP-1 General Alarm, at Scada

and at the Autodialer No. 1. For complete details, reference the Functional Description

for this alarm.

2.133.1 Ultra Violet System Breaker Trip/ Fail Alarm – This alarm occurs whenever the

supply circuit breaker (CB-12) for the system trips or if a UV System Fail alarm occurs

(line 1410). This alarm is annunciated as a CP-1 General Alarm, at Scada, at the

Autodialer No. 1 and at the remote annunciator. For complete details, reference the

Functional Description for this alarm.

2.133.2 Ultra Violet System Fail Alarm – This alarm occurs due to a UV System Fail

contact closure (line 1410) which is caused by a low output intensity of the UV lamps.

This alarm is annunciated as part of the Ultra Violet System Breaker Trip/ Fail Alarm as

described in the narrative directly above. For complete details, reference the Functional



Description for this alarm and also reference the manufacturer’s technical manual for

this alarm as found in the O&M Manual.

2.140 EXTERIOR LIGHTING

2.141 Exterior Lighting Overview - Exterior Site and Plant lighting has both hand and automatic

controls connected to operator switches SS1 and SS2 located on CP-1. Site lighting consists

of 2 pole-mounted luminaries located to the west and south of the treatment plant and is

automatically controlled by a photocell. Plant lighting consists of lighting fixtures mounted in

the clarifier area that also operate in auto from the photocell and in addition, from a motion

sensor located in the clarifier area.

2.142 Site Lighting - When operator switch SS1 on CP-1 is in the Hand position (line 228),

lighting contactor LC1 turns on energizing Site lighting. If SS1 is placed in the Auto position,

contactor LC1 will turn on when the photo cell (line 226) located outside closes its contacts

which will occur when ambient light decreases in the evening. In addition, when Site Lighting

contactor LC1 energizes, it also closes a contact LC1B that enables Plant Lighting as

described below.

Site lighting also has a manual bypass switch (line 231) which when closed will bypass all

controls described above and turn on the Site lighting contactor LC1 at line 229. The Bypass

switch is mounted on the outside southwest corner wall of the maintenance building. For

complete details, reference the Functional Description for this system.

2.141.3 Plant Lighting - When operator switch SS2 mounted on CP-1 is in the Hand position

(line 235), lighting contactor LC2 (line 236) turns on energizing Plant Lighting. If SS2 is

placed in the Auto position, contactor LC2 will turn on when the motion detector (line 243),

located on the east wall of the maintenance building, detects movement. However, Plant



Lighting will not turn on unless the Site lighting contactor LC1 is also on closing its contact

LC1B at line 240. This function operates Plant Lighting in auto from the photocell as well as

the motion detector.

Plant Lighting also has a manual bypass switch which, when closed, will bypass all controls

described above and turn on Plant Lighting and in turn Plant Lighting provided that the Site

Lighting contactor is also energized. The Bypass switch is mounted outside on the east wall

of the maintenance building. For complete details, reference the Functional Description for

this system.

2.150 LAB (ADMINISTRATION) BUILDING FIRE ALARM

2.151 Lab Building Fire Alarm - The alarm is energized by 3 smoke detectors (shown as 1

detector, line 1675) in the Lab/Office room, Equipment room and Bathroom areas. This alarm

is annunciated at the remote Annunciator and at the Autodialer No. 1. For complete details,

reference the Functional Description for this system.

2.160 LAB (ADMINISTRATION) BUILDING INTRUSION ALARM

2.161 Lab Building Intrusion Alarm – TD40 (line 1677) is energized by an intruder at either door

switch No. 1 or by door switch No. 2 in the Lab Building. This alarm is annunciated at the

remote Annunciator Panel at the Autodialer No. 1. The Key Switch shown on line 1680 is

used to prevent a false Intrusion alarm from being sent when authorized personnel enter the

administration building. The switch is located in a box mounted to the right of the main entry

door on the south side of the building. The switch must be turned to the Off position before

TD40 times out once Door Switches No.1 and No.2 located at each entry door have closed

due to an opened door.



2.170 S.T.E.P LT-1 & LT-2 INTRINSICALLY SAFE BARRIERS

2.171 Intrinsically Safe Barriers – The level transmitters, LT-1 & LT-2 for the Septic Tank

Effluent Pump (STEP) system have intrinsically safe barriers (ISB-1 & ISB-2, lines 469 and

513) installed to provide safe operation of electrical instruments installed in hazardous areas.

These devices limit the amount of energy that can be dissipated by components located in

hazardous areas during an electrical fault so that no explosion can occur due to a faulted

device. These devices are physically located in panel CP-1 in the bottom of B bay.

Please note that it is extremely important that these devices are connected properly to the

analog loop circuit. In particular, a solid ground connection to CP-1 panel ground must be

maintained so that if a fault condition exists, the faulted current has a solid path to ground to

enable the high energy of the fault to be safely dissipated.

Also notice that the devices are internally fused. If the instrument loop is not functioning,

check to see if the internal fuses in these devices have blown. If fuses are replaced, it is

important to ensure that an identical fuse replaces the blown fuse to maintain the integral

safety of the device.

2.180 DATA SIGNAL PROTECTORS

2.181 Data Signal Protectors Overview – Devices that provide protection from high voltage

surges such as those generated by lightening strikes. There are 2 of these devices (DSP-1

and DSP-2, lines 471 and 514) located in the bottom of B bay in panel CP-1. They are both

connected to the STEP-01 and STEP-02 level transmitter LT-1 and LT-2 loop circuits and

provide protection in those circuits.

These devices are not internally fused however, as was also true of the ISB devices described

in the narrative directly above, it is important that the correct wire connections to these



devices be maintained. That is, the ground connections between terminals E3 and L3 must

always be solidly connected to CP-1 panel ground to provide a path to exist for voltage surges

to be safely dissipated from the circuit.

2.190 INFLUENT FLOW METER SYSTEM

2.191 Influent Flow Loop Overview – The system measures Influent Flow generated by the

Influent Flow meter which generates a 4-20ma analog signal to enable instantaneous flow

readings at setpoint controller SCP-7, Flow Recorder No.1, Autodialer No. 2 and for the Flow

Samplers (lines 638 and 755). Total flow is provided by the Integrator and Flow Totalizer

operation counter. The major components of the Influent Flow system consists of a flow

meter FM-1 (line 638), an Integrator (line 644), a system Flow Recorder No.1 (line 649), an I/I

signal isolator, a recorder bypass switch SS4 (line 647) and a Flow Totalizer Counter (OC13).

2.192 Influent Flow Meter – The Influent Flow Meter FM-1 measures incoming sewage flow to

the facility and is located next to the northeast wall of the equipment room in the maintenance

building. It is connected to 120 VAC through CB-21 for its internal power requirements and

generates a 4-20ma signal that is proportional to the rate of influent flow. This 4-20ma analog

signal is used for various functions as described in detail in the following narratives.

2.193 Signal Isolator for Influent and Effluent Sampler Control – The I/I (current to current)

signal isolator is the first device in the Influent Flow analog loop at line 642. The isolator

increases the strength of the 4-20ma signal to the Flow Samplers and also electrically isolates

the signal from the main flow loop to the sampler loop. The isolator does not change the

value of the 4-20ma signal but generates the exact same analog value to the Samplers that is

generated by the Influent Flow Meter. DSP-3 is a data signal protector that is used to absorb

any harmful voltage surges that may be induced into the Sampler 4-20ma loop thus protecting

equipment connected to the loop conductors. Test point TP-31, 32, and 33 are used to allow



a current generator to be inserted between TP-31 and TP-32 to provide a 4-20ma current to

simulate a 0-100gpm signal to the samplers. This is used for calibration of the samplers. See

Sigma calibration procedures for samplers. USFS to add this to calibration section

2.194 Auto Telephone Dialer No. 2 – The next component in the Influent Flow 4-20ma analog

loop is the Auto Telephone Dialer No. 2 at line 648. The connection of the loop to the

Autodialer No. 2 allows remote monitoring of the instantaneous flow value.

2.195 System Flow Recorder – The third component in the loop is System Flow Recorder No.1

at line 649. This recorder monitors the 4-20ma Influent Flow rate and uses a paper chart to

record the flow values. The recorder is physically located on the upper left-hand corner of

CP-1 bay C door. To enable continuing flow loop operation should the recorder require

maintenance, Chart Recorder selector switch SS4 is connected such that if placed in the

Bypass position, the analog loop will be shorted around the chart recorder which enables the

removal of the recorder while maintaining operation of the 4-20ma flow loop. Care must be

used to ensure that the selector switch is returned to the Run position after the recorder is

returned to service. The scale of the chart is 0-100 gpm.

2.196 Influent Flow Setpoint Controller – The fourth component in the Influent Flow loop is the

Influent Flow Setpoint Controller, SPC-7 at line 627 and 646. This setpoint controller

measures the flow value in the 4-20ma loop (0-100 gpm) and displays the amount of flow in

gpm (gallons per minute) on the digital readout on the face of the instrument. SPC-7

Controller also turns on two alarms, One Pump Low Flow alarm and Two Pumps Low Flow

alarm. For additional details on alarm operation, reference the Functional Description Effluent

Flow section.

2.197 Integrator – The fifth component in the Influent Flow analog loop is the Integrator at line

644. This component monitors the 4-20ma (0-100 gpm) instantaneous flow rate and



internally, mathematically modifies the signal to represent total flow in the loop. When flow is

present in the loop, the component will momentarily close its contact periodically and counter

OC13 will be incremented by one count every 100 gallons of flow. Each count represents a

preset amount of flow that has been programmed into the Integrator. Currently, each count

on OC13 represents 100 gallons so the simple calculation of multiplying the total number of

counts on OC13 times 100 will give the total flow in gallons that has occurred in the Influent

Flow loop. To determine how many gallons has occurred over a period of time, record the

number of counts at the beginning of the time period and subtract from the number of counts

at the end of the period and multiply by 100

2.198 Influent and Effluent Samplers – The last components to operate from the Influent Flow

analog loop are the Influent (line 752) and Effluent (line 758) Samplers. Each component is

connected to the loop through the I/I Signal Isolator (lines 638 and 756) and monitors the

amount of flow represented by the 4-20ma signal. According to preset values, each sampler

will periodically and automatically open valves that remove samples of the Influent and

Effluent flows. The samples are then chemically analyzed to determine the operating

efficiency of treatment plant operation.

Test point TP-31, 32, and 33 are used to allow a Rochester 4-20ma current generator in

source mode to be inserted between TP-31 and TP-32 to provide a 4-20ma current to

simulate a 0-100gpm signal to the samplers. This is used for calibration of the samplers. See

Sigma calibration procedures for samplers. USFS to add this to calibration section

2.200 TEMPERATURE MONITORING

2.201 Temperature Monitoring Overview – The temperature monitoring system is comprised of

three separate but related systems. Ambient temperatures are monitored in the Lab Room,

Equipment Room and for the Outside Air. The values of the temperature readings are



displayed on separate setpoint controllers located in panel CP-1. The setpoint controllers also

provide local and remote alarms and also control a heat trace system for outdoor piping. The

following narrative describes each system separately.

2.202 Lab Room Ambient Air Temperature – The Lab room is monitored for ambient

temperature through the use of temperature transmitter TT-1 (line 677), setpoint controller

SPC-8 (line 663) and also through the Telephone Autodialer No. 2 (line 678). Currently, a Lab

Room High temperature alarm will be sent by SPC-8 at 90°F and a Lab Room Low

temperature alarm is sent at 35°F. The purpose of the high temperature alarm is to alert

operators since high temperatures can effect the operation and, in some cases, shorten the

life of electrical control equipment. The purpose of the low temperature alarm is to alert

operators of the condition so freezing condition can be prevented in the Lab Room.

2.203 Equipment Room Ambient Air Temperature – The Equipment room is monitored for

ambient temperature through the use of temperature transmitter TT-2 (line 697), setpoint

controller SPC-9 (line 683) and also through the Telephone Autodialer No. 2 (line 698).

Currently, an Equipment Room High temperature alarm will be sent by SPC-9 at 119.8°F.

The purpose of the high temperature alarm is to alert operators since high temperatures can

effect the operation equipment of the equipment in the room.

2.204 Outside Ambient Air Temperature – The outside air is monitored for ambient temperature

through the use of temperature transmitter TT-3 (line 721), setpoint controller SPC-10 (line

707) and also through the Telephone Autodialer No. 2 (line 722). Currently, no alarms are

configured for SPC-10 but the controller has one control contact that closes at 40°F. The

purpose of the control output is to energize the Heat Tape system before freezing

temperatures occur and keep selected process piping from freezing. The control contact (line



709) energizes the Heat Tape contactor C2 (line 1390) to turn on power to the heat tape

system (line 176).

2.210 SCADA REMOTE RESET

2.211 Scada Remote Reset Overview – (Note: As of 3/1/02, no Scada system has been

installed. The narrative in this section is given for drawing clarification only). The Scada

system has a remote alarm reset capability that will allow the General Alarms in CP-1 to be

reset from a remote location. Line 1420 shows the Scada contact closure energizing relay

R49 which is used to reset any latched General Alarms by de-energizing the alarm system

supply conductor R at contact R49B (line 1428). Notice that if the initiating alarm condition

has not reset when the Scada Remote Reset feature has been used, the alarm will return

after the Scada Remote Reset has de-energized and after a short time delay provided by

TD34.

2.220 CONTROL FUSES WITH PIN INDICATORS

2.221 Overview – Each remote 4-20ma analog instrument loop circuit is provided with fuses that

visibly indicate a blown fuse condition to aid in troubleshooting and quickly locating faulty

circuits. The fuse, when blown, will cause a mechanical pin to extend from one end of the

fuse to indicate the blown condition. Fuses with extended pins must be discarded and replace

with new fuses as the fuse cannot be “reset” by pushing the pin back into the fuse. The fuses

are set for .5A (1/2 amp or 500ma) and must be replace with the same amperage and type of

fuse. Reference the Functional Description for Control Fuses for additional details.

2.230 TRANSIENT VOLTAGE SURGE SUPPRESORS

2.231 Overview – Transient Voltage Surge Suppressors and Lightning Arrestors are connected

to the electrical distribution system to provide protection for connected equipment against



power surges and spikes that can occur in the power supply system. At lines 4 & 8 and at line

136, two Lighting Arresters (LA) and one transient voltage surge suppressor (TVSS) are

shown. When high voltage spikes and surges due to lightning strikes or other equipment

connected elsewhere in the electrical distribution system occur, components mounted within

the Lightning Arrestors and TVSS absorb the high energy levels of the spike or surge and

reduce the voltage to a level that will not damage connected equipment.

Surge protection equipment is located in CP-1 in D bay in the upper left hand corner and

mounted next to Lighting Panel LP-1 in the Equipment Room.

The surge protection equipment requires no maintenance or operational adjustments, etc.

under normal conditions. However, there are green LED indicating lights located on the

equipment that show the state of internal components. If any of these internal components

are damaged due to spikes or surges, the equipment must be replaced to ensure continued

protection for connected equipment. If the LED lights on the front of the surge protector

enclosure are lit, the internal components are working properly. If one or more of the lights

are not lit and power is available to the surge protector, the unit is faulty and must be

replaced. For additional information, reference the Maintenance Manual, 16900 sec 2.16 and

2.17.

2.240 MOTOR OVERLOADS

2.241 Overview – The motor starters mounted in Bays C and D of CP-1 use a protection device

called a motor overload. The motor overload device senses motor running current in a motor

circuit and activates to turn the motor off if the current value increases to an amount that can

damage motor windings or motor circuit conductors. Motor overload devices are located

internally within each motor starter enclosure and have “reset” pushbuttons extruding through

the front of the enclosure.



2.242 Motor Overload Reset – If a motor overload device senses an out of range motor current,

the unit will “trip” and disconnect the motor starter from its control circuit. Once the overload

“trips”, it will remain in the tripped condition preventing the motor from starting until the

overload unit is “reset” by pushing the reset button mounted in the face of each motor starter

enclosure within CP-1. A tripped condition will be noticed when depressing the reset button in

that as the button is pushed, some resistance will be noticed. On a unit that has not tripped,

no resistance will be noticed when the button is depressed.

After an overload unit has tripped due to a motor overload condition and before depressing

the reset button, the motor needs to be checked to ensure that it hasn’t been damaged.

Using the Digester Blower motor DB-01 (line 58) as an example, after opening the supply

circuit breaker MCP-5 use the high voltage range (500 volts or more) on a multimeter and

ensure that power has been disconnected from each motor supply conductor by reading the

potential difference between each conductor (5M1, 5M2 and 5M3) and between each

conductor and ground. After ensuring no power is present on the supply conductors, use the

lowest scale resistance setting on the meter and measure the resistance of each motor lead

at terminals 5T1, 5T2 and 5T3 measuring from 5T1 to 5T2, from 5T1 to 5T3 and last from 5T2

to 5T3. The amount of resistance will vary from approx. 10 ohms or somewhat higher for

small motors to 5 ohms or less for larger motors. If any resistance reading is 0 ohms, the

motor is most likely shorted and will have to be replaced. If any resistance reading is

extremely high the motor has an open wire that will have to be repaired. Also read from each

of the motor leads to a ground connection using a high resistance scale of 1 meg ohm or

more. If the reading is 50,000 ohms or less, the insulation on the motor windings are most

likely damaged and the motor will have to be replaced.



After taking the readings as described directly above, visually inspect the motor if possible. If

the motor is extremely hot and especially if a noxious burnt smell is observed the motor is

most likely damaged and must be replaced.

If the motor passes all inspections and readings, ensure that the multimeter is removed from

any connection to the power circuit and re-energize the circuit by closing circuit breaker MCP-

5. Connect the fluke current probe on the motor leads one at a time and measure motor

running current in each phase after reset button on overload is reset or MCP is reset.

Compare this to the full load amps listed in the O&M spreadsheet under MOTOR DATA

SHEETS. On the face of the motor starter, depress the reset button and if tripped, a small

click will be felt in the button and also possibly heard. This click will indicate that the overload

device was tripped and has been reset. It is possible that if the overload device has just

tripped, depressing the reset button will not reset the device as not enough time has elapsed

to cause the device to cool and reset. If this condition is observed, wait a short period of time

(5 to 10 minutes) and depress the reset button once again. The 2nd attempt should reset the

overload device.

After the overload device is reset, the motor starter will once again energize and run the motor

if the motor is required to run by the control circuit connected to it.

2.250 ANALOG LOOP DESCRIPTION

2.251 Overview – The analog loops used in the Multnomah Falls Waste Water Treatment

Plant operate on a low direct current signal (4-20ma) that represents an engineering value

(feet of water, pounds per square inch, etc) in the process being measured. In this commonly

used system, a 4 milliamp (shortened to ma) signal represents a zero value (or the lowest

value measured) in the process while a 20 ma signal represents the maximum value in the

process. Thus for a flow signal loop reading from 0 to 100 gallons per minute (gpm), a



reading of 4 ma would represent no flow in the system and would equal 0 gpm while a reading

of 20 ma would represent a maximum flow of 100 gpm.

This signal is connected to various devices such as the setpoint controllers, e.g., SPC-1 and

to a chart recorder, the Telephone Autodialers and other devices as described below. Each

device has a specific function that allows for reliable and/or useful operation (control and

information recording) of each analog loop.

For operational descriptions concerning individual components in this circuit, reference the

operating instructions given elsewhere in this section, e.g., for fuses reference the section for

Fuses, for setpoint calibration reference the section for Setpoint Controller Calibration, etc.

2.252 Analog Loop Operational Descriptions

2.252.01 Step-01 Level Transmitter (LT-1) Analog Loop - Setpoint Controller, SPC-1

operates from an analog loop that is normally connected to level transmitter, LT-1 (line

477) located in the Septic Tank. The transmitter is terminated at a data surge protector,

DSP-1, (line 471) in the CP-1 panel. Between the transmitter and the panel terminations

are 3 devices which provide protection, 2 devices against lightning strikes, LP-3 and a

device that protects the quality of the signal, DSP-3 (line 476). Fuses F9 and F10 are

installed along with test points TP1, TP2 and TP3. The circuit is connected to the Auto

No. 2 (line 470) and finally to setpoint controller SPC-1 (line 457).

At terminals TS9-1 and TS9-2, the circuit is connected to SS-20 (line 480). This selector

switch is mounted on the door of C bay near the left side of the door. The switch is used

to ensure that a level signal for the Septic Tank is available for SPC-1 and SPC-2 even

though one of the tank level transmitters is not working. Normal position of SS-20 is in



the Auto position. When in this position, the analog level signal for LT-1 is connected to

SPC-1 and the level signal for LT-2 is connected to SPC-2.

If a fault occurs on either level transmitter, SS-20 can be turned to enable the remaining

functioning transmitter to be connected to both setpoint controllers thus keeping the

STEP pumps operating. If LT-1 faults, SS-20 can be turned to the LT-2 position and LT-2

is connected to both SPC-1 and SPC-2. If LT-2 faults, SS-20 can be turned to the LT-1

position and LT-1 is connected to both SPC-1 and SPC-2.

Setpoint controller, SPC-1 has 2 alarm contacts and 1 control contact (lines 457 through

462). The level at which these contacts open/ close can be adjusted. Currently, low level

alarm 1 will close at 3 feet, high level alarm at 6.25 feet and the control contact will close

at 5 feet. The alarm contacts will open at a value of .1 feet (HY1 & HY2 value) below the

close setpoint and the control contact will open .5 feet (H value) below the close setpoint.

To modify these values, reference the manual on Calibration Procedures for this

equipment and follow the instructions found there under the section Set Operating

Parameters.

Caution: If a change to the setting of the control contact closure (line 457) is made, note

that the Lead/ Lag relationship with setpoint controller SPC-2 (line 499) must be

maintained. Care must be taken to ensure that SPC-1 control contact closes to start the

Lead pump before the control contact on SPC-2 (line 501) closes to start the Lag pump.

Also, the level at which both contacts open must be considered as the control contact for

SPC-2 must open and stop the Lag pump before the control contact for SPC-1 opens to

stop the Lead pump. A good rule of thumb would be to ensure that the open setpoint

(on/off deadband also called the H value or hysteresis) for SPC-2 is either equaled or

made less than the open setpoint (H value) for the control contact on SPC-1 (currently .5



feet). This value is also modified as described in the Set Operating Parameters section

as reference in the narrative directly above.

2.252.02 Step-02 Level Transmitter (LT-2) Analog Loop -

FP

Setpoint Controller, SPC-2 operates from an analog loop

that is normally connected to level transmitter, LT-2 (line

520) located in the Septic Tank. The transmitter is

terminated at a data surge protector, DSP-2, (line 514) in

the CP-1 panel. Between the transmitter and the panel

terminations are 3 devices which provide protection, 2 devices against lightning strikes,

LP-4 and a device that protects the quality of the signal, DSP-4 (line 519). Fuses F11

and F12 are installed along with test points TP4, TP5 and TP6. The circuit is connected

to the Autodialer No. 2 (line 514) and finally to setpoint controller SPC-2 (line 501).

At terminals TS9-4 and TS9-5, the circuit is connected to SS-20 (line 480). The functions

of this selector switch were described directly above in the narrative Step-01 Analog Loop

Operation.


506). The level at which these contacts open/ close can be adjusted. Currently, low level

alarm 1 will close at 3 feet, high level alarm at 6.25 feet and the control contact will close

at 5.25 feet. The alarm contacts will open at a value of .1 feet (HY1 & HY2 value) below

the close setpoint and the control contact will open .5 feet (H value) below the close

setpoint. To modify these values, reference the manual on Calibration Procedures for

this equipment and follow the instructions found there under the section Set Operating

Parameters.

ile: Oper Instr 3-1-02 Final.doc of 112 rinted: 4/22/2004


Caution: If a change to the setting of the control contact closure (line 501) is made, note

that the Lead/ Lag relationship with setpoint controller SPC-1 (line 455) must be

maintained. Care must be taken to ensure that SPC-1 control contact (line 457) closes to

start the Lead pump before the control contact on SPC-2 (line 501) closes to start the Lag

pump. Also, the level at which both contacts open must be considered as the control

contact for SPC-2 must open and stop the Lag pump before the control contact for SPC-1

opens to stop the Lead pump. A good rule of thumb would be to ensure that the open

setpoint (on/off deadband also called the H value or hysteresis) for SPC-2 is either

equaled or made less than the open setpoint for the control contact on SPC-1 (H value,

currently .5 feet). This value is also modified as described in the Set Operating

Parameters section as reference in the narrative directly above.

2.252.03 B-01 Pressure Transmitter (PT-1) Analog Loop - Setpoint Controller, SPC-3

operates from an analog loop that is connected to pressure transmitter, PT-1 (line 550)

located in the Equipment Room. The transmitter is terminated at terminals TS9-7 and

TS9-8 in the CP-1 panel. Fuses F13 and F14 are installed along with test points TP7,

TP8 and TP9. The circuit is connected to the Autodialer No. 2 (line 551) and finally to

setpoint controller SPC-3 (line 539 & 551).


544). The amount of pressure at which these contacts open/ close can be adjusted.

Currently, low pressure alarm 1 will close at 2 psig, high pressure alarm at 7.75 psig and

the control contact will close at 5.68 psig to start VFD-1 and run blower B-01. The alarm

contacts will open at a value of .1 psig (HY1 & HY2 value) below the close setpoint and

the control contact will open close setpoint to turn off VFD-1. To modify these values,



reference the manual on Calibration Procedures for this equipment and follow the

instructions found there under the section Set Operating Parameters.

2.252.04 B-02 Pressure Transmitter (PT-2) Analog Loop - Setpoint Controller, SPC-4







562). The amount of pressure at which these contacts open/ close can be adjusted.

Currently, low pressure alarm 1 will close at 2 psig, high pressure alarm at 7.75 psig and

the control contact will close at 5.45 psig to start VFD-2 and run blower B-02. The alarm

contacts will open at a value of .1 psig (HY1 & HY2 value) below the close setpoint and

the control contact will open at the close setpoint turning off VFD-2. To modify these

values, reference the manual on Calibration Procedures for this equipment and follow the


2.252.05 DB-01 Pressure Transmitter (PT-3) Analog Loop - Setpoint Controller, SPC-5




TP14 and TP15. The circuit is connected to the Auto No. 2 (line 595) and finally to


Setpoint controller, SPC-5 has 2 alarm contacts (lines 586 through 588). The amount of

pressure at which these contacts open/ close can be adjusted. Currently, low pressure



alarm 1 will close at 2 psig and high pressure alarm 2 at 7.00 psig. The alarm contacts

will open at a value of .1 psig (HY1 & HY2 value) below the close setpoint. To modify

these values, reference the manual on Calibration Procedures for this equipment and

follow the instructions found there under the section Set Operating Parameters.

2.252.06 DB-02 Pressure Transmitter (PT-4) Analog Loop - Setpoint Controller, SPC-6







pressure at which these contacts open/ close can be adjusted. Currently, low pressure

alarm 1 will close at 2 psig and high pressure alarm 2 at 7.00 psig. The alarm contacts

will open at a value of .1 feet (HY1 & HY2 value) below the close setpoint. To modify

these values, reference the manual on Calibration Procedures for this equipment and

follow the instructions found there under the section Set Operating Parameters.

2.252.07 Influent Flow Transmitter (FM-1) Analog Loop Operation – Setpoint Controller,

SPC-7 operates from an analog loop that is connected to the Influent Flow meter, FM-1

(line638) located in the Equipment Room. This loop was described above in the section

Influent Flow Meter System. Reference that portion of the narrative for additional loop

information.


flow at which these contacts open/ close can be adjusted. Currently, low flow alarm 1 will

close at 25.00 gpm and high flow alarm 2 at 45.00 gpm. Each of these contacts will open



when the flow sensed by FM-1 drops below .1 gpm (HY1 & HY2 value) below the close

setpoint. To modify these values, reference the manual on Calibration Procedures for

this equipment and follow the instructions found there under the section Set Operating

Parameters.

2.252.08 Lab Room Temperature Transmitter (TT-1) Analog Loop Operation – Setpoint

Controller, SPC-8 operates from an analog loop that is connected to the Lab Room

Temperature Transmitter, TT-1 (line 663) located in the Lab Room. This loop was

described above in the section Temperature Control System. Reference that portion of

the narrative for additional loop information.

Setpoint controller, SPC-8 has 2 alarm contacts (lines 668 through 670). The

temperature at which these contacts open/ close can be adjusted. Currently, low

temperature alarm 1 will close at 35.00 °F and high temperature alarm 2 at 90.00 °F.

Each of these contacts will open when the temperature sensed by TT-1 drops below .1 °F

(HY1 & HY2 value) below the close setpoint. To modify these values, reference the

manual on Calibration Procedures for this equipment and follow the instructions found

there under the section Set Operating Parameters.

2.252.09 Equipment Room Temperature Transmitter (TT-2) Analog Loop Operation –

Setpoint Controller, SPC-9 operates from an analog loop that is connected to the

Equipment Room Temperature Transmitter, TT-2 (line 697) located in the Equipment

Room. This loop was described above in the section Temperature Control System.

Reference that portion of the narrative for additional loop information.

Setpoint controller, SPC-9 has 2 alarm contacts (lines 688 through 690). The

temperature at which these contacts open/ close can be adjusted. Currently, low

temperature alarm 1 will close at 35.00 °F and high temperature alarm 2 at 119.8 °F.



Each of these contacts will open when the temperature sensed by TT-2 drops to .1 feet

(HY1 & HY2 value) below the close setpoint. To modify these values, reference the

manual on Calibration Procedures for this equipment and follow the instructions found

there under the section Set Operating Parameters.

2.252.10 Outside Air Temperature Transmitter (TT-3) Analog Loop Operation – Setpoint

Controller, SPC-10 operates from an analog loop that is connected to the Outside Air

Temperature Transmitter, TT-3 (line 707) located on the east side of the Lab Room

outside wall. This loop was described above in the section Temperature Control System.

Reference that portion of the narrative for additional loop information.

Setpoint controller, SPC-10 has 1 control contact (lines 709 & 710). The temperature at

which this contact opens/ closes can be adjusted. Currently, the contact will close at

30.00 °F and turn on the Heat Tape contactor. This contact will open when the

temperature sensed by TT-3 drops below the setpoint of the) value H (hysteresis of .5 (at

29.5°F) and turn the contactor off. To modify these values, reference the manual on

Calibration Procedures for this equipment and follow the instructions found there under

the section Set Operating Parameters.

2.252.11 Ultra-Violet Intensity Transmitter Analog Loop - Setpoint Controller, SPC-11 (in

CP-1) operates from an analog loop that is connected to the UV controller intensity

transmitter (line 722) located outside the east wall of the Equipment Room. The

transmitter is terminated at data signal protector DSP-4 in the CP-1 panel. Fuses F31

and F32 are installed along with test points TP34, TP35 and TP36. The circuit is

connected to the Autodialer No. 2 (line 766) and finally to setpoint controller SPC-11 (line

732 & 764).



Also connected to the circuit is a chart recorder, REC-2 (line 773) which records levels of

UV intensity on a paper strip for the purpose of keeping a record of UV output.

A last device connected in the circuit is selector switch SS21 which is used to keep the

analog loop operating should the recorder be removed for maintenance. Placing SS21 in

the Run position operates the circuit with the recorder functioning in the circuit. Turning

SS21 to Bypass will allow continued use the circuit with the chart recorder removed.

2.252.12 Water Tank Level Transmitter (LT-3) Analog Loop - Setpoint Controller, SPC-11

(in the remote Annunciator Panel) operates from an analog loop that is connected to a

water level transmitter, LT-3 (line 4289) located in the Water Tank. This circuit is

described below under the section Water Tank Level Transmitter in the Annunciator

Panel section. Reference that section for additional details.

Setpoint controller, SPC-11 has 2 alarm contacts and 1 control contact (lines 4264

through 4269). The level at which these contacts open/ close can be adjusted.

Currently, low level alarm 1 will close at 3.00 feet, high level alarm at 12.00 feet and the

control contact will close at 6.00 feet (USFS verify all level settings). The alarm contacts

will open at .1 feet (HY1 & HY2 value) below the close setpoint. The control contact will

open at H (hysteresis) value of 2.00 (at 4.00 ft) below the close setpoint. To modify these

values, reference the manual on Calibration Procedures for this equipment and follow the




3.0 REMOTE ANNUNCIATOR PANEL

3.01 ANNUNCIATOR SYSTEM CHECK

The following checklist should be completed prior to energizing the Annunciator Panel:

3.01.01 Inspect position of all test switches located on the lower half of the inside of

the Annunciator Panel door. Set switches to the position in the following chart:

Test Switch Position Chart For Normal Plant Operation Schematic Line No.

Switch No. Position Schematic

Line No. Switch

No. Position










4115 TS-10 AUTO 4230 TS-22 AUTO

4134 TS-11 AUTO 4237 TS-23 AUTO

4141 TS-12 AUTO 4244 TS-24 AUTO

After completing ‘test switch’ position inspection close the Annunciator Panel

door.

3.01.02 Inspect position of all selector switches located on the front of the Annunciator

Panel door. Set switches to the position in the following table.

Selector Switch Position Chart For Initial Plant Startup


Multnomah Falls WWTP Operating Instructions - Continued: Schematic Line No.

Switch No. Position Service

4031 SS-1 ON Annunciator General Audible Alarm

4317 SS-3 SPC Well Pump Call

3.01.03 Open the Annunciator Panel door and inspect the control fuses located on the

right side terminal strip TSA4 for blown fuses. Replace any fuse that indicates

it s blown with an exact replacement.

3.01.04 Set the circuit breakers located in the Annunciator Panel to the position in the

following chart:

Schematic Line No.

Breaker No. Position Voltage Service

4003 CB-1 ON 201/120 VAC Annunciator Panel Power (turned on after door closed)

4005 CB-2 ON 120 VAC Service Receptacle

4009 CB-3 ON 120 VAC Transformer CPT-1

4019 CB-4 ON 120 VAC Power Supply PS-1

4027 CB-5 ON 120 VAC Gel Cell Batteries

4303 CB-6 ON 120 VAC Transformer CPT-2

4304 CB-7 ON 24 CVAC 24 VAC Bus B/C

After completing fuse inspection and setting all breakers to the position described

above (with the exception of CB-1), close and latch the Annunciator Panel door.

This completes the system check and the Annunciator Panel is now ready to be

energized.



3.10 ENERGIZE THE SYSTEM

After closing the enclosure door, turn on the disconnect switch which operates CB-1 located on the

upper right hand side of the enclosure to energize 240VAC power to the panel. The 120VAC panel

power is monitored by voltage monitor (under/overvoltge) relay MR1 (line 4016) for under voltage

and loss of phase opening contact MR1-A (line 4014).

3.11 MONITOR RELAY 3.11.1 Monitor Relay Operation – The Annunciator panel has a power (voltage) monitor relay

MR1 (line 4016) that measures the level of voltage supplied to the panel. If the level of

voltage varies either higher or lower than preset levels, the relay will trip, open its contact

MR1-A (line 4014) and turn on the under or over voltage LED indicator lights mounted in the

relay. When contact MR1-A opens, power is disconnected from bus A2/N2 effectively

shutting down the Annunciator panel. When voltage returns to normal values, MR1 will

automatically reset and close its MR1-A contact thus restoring power to connected

components. The LED indicators will also turn off. The relay does not directly alarm to a

remote alarm site but when a voltage loss of any source occurs, relay R11 (line 4306) will

alarm loss of power including the opening of MR1-A contacts.

3.11.2 Monitor Relay Bypass Switch – A Bypass switch SW1 (line 4016) has been installed to

allow continued operation of the Annunciator panel should the Monitor relay fault or should it

be determined that operation of the panel is required in a low or high voltage condition.

Moving the switch to the Off Bypass position will effectively short out the MR1-A contacts

(line 4014) and allow power to be applied to connected components regardless of the state of

the contacts (open or closed). Care must be used to ensure that when the Bypass feature is


Multnomah Falls WWTP Operating Instructions - Continued: no longer required, Sw1 must be returned to the Normal On position to enable MR1 to

protect connected components from voltage fault conditions.

3.11.3 Power Monitor Relay Adjustment – The Power Monitor relay can be adjusted if required

as follows:

Before doing any adjusting, turn Bypass Switch SW1 to the Off Bypass position to avoid

loosing power during the adjustment procedure.

Turn the under voltage adjustment pot clockwise until the relay trips and the under voltage

LED turns on. Stop turning the pot and reverse turning direction counterclockwise. Rotate

slowly just until the relay turns back on and the LED turns off. Stop at this point.

Next rotate the over voltage adjustment pot counterclockwise until the relay trips and the

over voltage LED turns on. Stop turning the pot and reverse turning clockwise direction.

Rotate slowly just until the relay turns back on and the LED turns off. Stop at this point.

Ensure that the Bypass Switch SW1 is returned to the Normal On position before leaving the

Annunciator panel.

For other methods of adjusting the relay, reference the Maintenance Manual section 16900,

2.28I for additional instructions.

3.12 TEST SWITCHES

A total of 25 test switches are provided inside the enclosure mounted on the inside door. The test

switches are not to be used as a part of normal operation. The test switches provide the operator

with the capability to simulate the function of the components they represent. This allows the entire

system to be tested easily. For normal operation, test switches TS1 through TS24 should be in the

A (AUTO) position. For special purposes or emergency operation, these test switches can be



moved to the C (CLOSE) or O (OPEN) position. Also, test switch SW1 should be normally operated

in the ON position. Only a competent technician should operate the test switches.

3.13 PILOT LIGHTS

Normal running conditions are indicated by green and white pilot lights. A red light indicates an

alarm condition and should be checked. The only green light indicates that the Well House Pump

motor is running.

The power on white lights function as volt meters to check both the 24VAC buss and the 24VDC

buss. These are critical to the operation of the control circuits. The white power on lights need to

be on for the control system to operate. If a power on light is off, check the respective 24 VAC or

24 VDC bus with a voltmeter. The LED lamps provided in the lights have a 50,000 hour life and

because they operate continuously, will last for approx. 5.5 years and most likely will not be burned

out. It is more likely that a circuit breaker has tripped in the power supply bus or the primary

breaker on the transformers. If any one of these power “ON” lights is off, the entire control system

may be shut off.

3.20 WELL PUMP

3.21 Well Pump Overview - Remote control of the Well House Well Pump is provided in the

Remote Annunciator Panel. The primary control for the operation of the pump is through LT-3

(SCP-11 line 4262); relays R8, R9 and R10 (lines 4319 through 4322) and selector switch SS3 (line

4317). Well Pump running indication is monitored and shown by a green indicating light (line 4041)

and by the run time meter RTM-1 (line 4310) and operation counter (line 4311) OC-1.

3.22 Well Pump Run Time Meter and Operation Counter - The well pump motor operated by this

panel is equipped with a run time meter and operation counter. These components are energized



by contact R2A (line 4310) which closes when relay R2 (line 4040) energizes. Relay R2 and green

indicating light IL2 (line 4041) energize when the contact Well Pump Run closes (line 4043)

indicating that the pump motor is running. These devices will automatically record the total run time

in hours and the number of times the motor has started. It is suggested that a weekly log of the

readings be kept. Any unusual change in the readings should be investigated. The readings may

give a good clue as to the nature of any problems.

3.23 Well Pump SPC Operation - Placing SS3 (line 4317) in the SPC mode will allow the Well

Pump to be controlled by SPC-11 control output contact (lines 4264, 4265). SPC-11 monitors the

4-20 ma signal generated by the water tank level transmitter LT-3 (line 4289). The pump will turn

on/off by SPC-11 control output contact (line 4319), which in turn, energizes relay R10 (line 4319).

R10 will continue to turn on/off as per SPC settings even though the pump motor starter or circuit

breaker may be tripped as no feedback signal is included in the Remote Annunciator Panel control

circuit to de-energize R10 on fault conditions. R10 will turn off when SS3 is placed in the OFF

position. The water tank level is alarmed through SPC-11 alarm contacts AL-1/AL-2 (lines

4066/4058) which energize R5/R4 (lines 4064/4056), indicators IL5/IL4 (lines 4066/4058), and

LED5/LED4 (lines 4068/4060). A digital display of the water tank level is also provided at the light

box located in the lodge.

3.23.0 Water Tank Level Transmitter - Setpoint Controller, SPC-11 operates from an analog

loop that is connected to level transmitter, LT-3 (line 4289) located in the Water Tank.

The transmitter is connected to terminals TSE1-9 and TSE1-10 in the Annunciator

Panel. Between the transmitter and the panel terminations are 3 devices which provide

protection, 2 devices against lightning strikes, LP and LPE1-5 and also a device that

protects the quality of the signal, DSP. In the Annunciator Panel, the transmitter is

connected to another device, data signal protector DSP-1 used once again to protect



the quality of the analog signal. Fuses are installed F55 and F56 along with test points

TP1, TP2 and TP3.

3.23.1 Water Tank Level Signal Repeater Loop – The analog loop from the transmitter is

connected to a signal repeater SR-1 (line 4279). This component copies the 4-20ma

signal from the transmitter and reproduces it for an input to the Telephone Autodialer

No. 2 in CP-1 (lines 2180, 4292 and 4343) which is shown as an input to Scada on the

schematic drawings. Before the signal leaves the Annunciator Panel, it is connected to

another data signal protector, DSP-2 (line 4286). Also, fuses F59 and F60 (line 4288)

are connected to this portion of the circuit. (See calibration section for setup and

calibration of this unit)

3.23.2 Water Tank Level Remote Indicator – The level loop is also connected to a remote

digital display, DD-1 located in the Remote Light Box. In addition, fuses F57 and F58

(line 4282) are located in this portion of the instrument loop.

3.23.3 Water Tank Level Setpoint Controller SPC-11 – The last device connected to the

loop is the setpoint controller, SPC-11 (line 4262). The operation of this device was

previously described in the above narrative under the section Well Pump SPC

Operation.

3.23.4 Water Tank Level Setpoint Controller (SPC-11) Calibration – The calibration of

SPC-11 was previously included in the section Setpoint Controller Loop Setup/

Calibration in the above narrative in the CP-1 section. Review the narrative in this

section to calibrate SPC-11 for the Water Tank Level.



3.24 Well Pump HAND Operation - Placing SS3 in the HAND mode will allow R10 (line 4319) to

energize and run the pump continuously providing a fault does not occur in the motor controls at the

Well House. R10 will turn off when SS3 is placed in the OFF position.

3.25 Well Pump LEVEL SWITCH Operation - Placing SS3 in the LEVEL SWITCH mode will allow

R10 (line 4319) to energize and run the pump as per water tank level as sensed by float switches

located in the water tank (lines 4062 and 4069). SPC-11 alarm contacts AL-1/Al-2 (lines

4066/4058) are paralleled with the float switches providing a redundant control system. Relays

R4/R5 close contacts at lines 4313 and 4315 to turn R8 and R9 on/off which turns R10 on/off

through R8A/R9A contacts (line 4322) with R9A turning R10 on and R8A turning R10 off.

3.26 Benson Park Well House Alarm - The remote water system panel at Benson State Park

provides a general trouble contact (line 4053) which energizes relay R3, indicator IL3, and LED3

(lines 4048/4050/4052). Contacts R3A/R3C (lines 4331/4351) enables the SCADA and Autodialer

No. 1 Well House General Alarms.

3.30 TRANSIENT VOLTAGE SURGE SUPRESSOR (TVSS)

3.31 Overview – The Annunciator Panel has built in devices to protect the connected electrical

circuits from damage due to lighting strikes or other power spikes found in electrical distribution

systems. A transient voltage surge suppressor, TVSS (line 4011) is connected to the electrical

distribution system to provide protection for connected equipment against power surges and spikes.

When high voltage spikes and surges due to lightning strikes or other equipment connected

elsewhere in the electrical distribution system occur, components mounted within TVSS absorb the

high energy levels of the spike or surge and reduce the voltage to a level that will not damage

connected equipment.



Surge protection equipment is mounted on the back panel just above the middle portion of the

panel next to PS-1.

3.32 Surge Protection Operation – The surge protection equipment requires no maintenance or

operational adjustments, etc. under normal conditions. There are no lights or other indicators on

this devise to indicate if power is on or if the unit is functioning properly. If any of these internal

components are damaged due to spikes or surges, the equipment must be replaced since the unit

may cut off power to connected equipment. The unit plugs into the GFI receptacle also mounted on

the back panel. This feature allows for easily replacement since the TVSS can be replaced by

unplugging a damaged unit and plugging in a new unit without disconnecting/ reconnecting any

conductors. For additional information, reference the Maintenance Manual, 16900 sec 2.18.

3.40 DATA SIGNAL PROTECTORS (DSP)

3.41 Data Signal Protectors Overview – These are devices that provide protection from high

voltage surges such as those generated by lightening strikes. There are 2 of these devices (DSP-1

and DSP-2, lines 4279 and 4286) located in the Annunciator Panel. They are both connected to the

Water Tank level transmitter LT-3 loop circuit.

3.42 Data Signal Protectors Operation – These devices are not internally fused however, it is

important that the correct wire connections to these devices be maintained. That is, the ground

connections between terminals E3 and L3 must always be solidly connected to the Annunciator

Panel ground to provide a path to exist for voltage surges to be safely dissipated from the circuit.

There are no other operational considerations for these devices.



3.50 ALARM DESCRIPTION

3.51 Alarm Overview - Alarm conditions are annunciated on the door face of the Remote

Annunciator Panel and Remote Light Box, reference schematic drawing lines 4048 through 4254,

through audible (horn/buzzer lines 4031/4034) and visual alarms (red indicating lights) and also at

the annunciator panel (line 4037).

Remote alarm conditions will remain true until reset at the control panel generating the alarm.

Reference the control systems for the generating alarm to determine the method used to reset

individual alarms (e.g., sec. 2.90 above for CP-1). The two alarms (Water Tank High/Low)

generated by the Remote Annunciator panel are reset when the alarming condition returns to

normal.

A general alarm indicating light and buzzer will be sounded any time an alarm occurs (R6A line

4031). For the Remote Annunciator Panel, the alarm horn can be silenced by moving the horn off

selector switch (SS1 line4031) to the OFF position. For the Remote Light Box, the buzzer at the

Light Box can be silenced by turning its horn off switch (SS2 line 4034) to the OFF position. The

backup battery (line 4027) will supply power to horns and lights in both panels in the event of a

power failure. Each alarm circuit is protected by fuses located in the remote annunciator panel.

3.52 Annunciator Battery Backup General Alarm System - A Battery Backup alarm system is

provided for with a red indicating light IL26 (line 4032) and SonAlert audible alarm SA (line 4031)

mounted on the door of the Annunciator panel. In addition, remote alarms are provided at CP-1 in

the Treatment Plant through the energizing of the remote red indicating light IL81 (line 4038,

mounted on CP-1 D bay door) and at the remote SonAlert SA (line 4034) and red led 26 (line 4036)

mounted in the Light Box panel. The system annunciates General and Bus Failure alarms within



the vicinity of the Annunciator panel, at panel CP-1 and at the Light Box. The controls to operate

this system are shown at lines 4024 through 4038.

Under normal conditions, power supply PS-1 (line 4019) supplies 24 VDC power to wires +1 and –1

charging the Gel Cell batteries (line 4027 and 4029) and energizing relay R1 (line 4025). Relay R1

in turn holds its contact R1B (line 44029) open and closes contact R1A (line 4031). This action by

relay R1 prevents IL26 (line 4032), the two audible alarms SA (lines 4031 & 4034) and the red led

26 from turning on in the absence of fault conditions and also enables General and Bus Power Loss

alarms to be announced on the alarm system.

When a General Alarm occurs in the alarm system, relay R6 (line 4252) is energized. Relay R6

contacts R6A (line 4031) will close and because relay contact R1A (line 4031) is closed during

normal PS-1 operation, IL26 (line 4032), the two audible alarms SA (lines 4031 & 4034) and the red

led 26 will be energized annunciating the alarm condition at the Annunciator panel. Also, if the 24

VAC bus alarm occurs, relay R11 (line 4306) will de-energize closing its contact R11B (line 4034)

which, as was true with the General alarm, will cause the alarm components IL26, two SAs and

LED 26 to annunciate.

If 120 VAC power is lost to power supply PS-1 (line 4019), if PS-1 internally faults and no longer

provides 24 VDC power or if a fault occurs in the wiring to relay R1, the relay will de-energize.

Because diode D1 (line 4027) prevents a reverse electrical current from the Gel Cell batteries from

flowing through the diode to relay R1, the relay remains de-energized. Because R1 is de-

energized, relay contact R1B is closed applying 24 VDC power from the batteries to alarm

components IL26, two SAs and LED 26 which annunciates the loss of power to wires +1 and -1. In

addition, contact R1A opens to prevent relay R1 from being energized by the batteries should

contacts R11B (line 4034) be closed.



The Annunciator alarm system will continue to alarm until either 24 VDC power is restored to the +1

and –1 wires, the batteries loose their charge, CB5 (line 4027) is opened, or, for the audible alarms

only, selector switch SS1 (line 4031) or SS2 (line 4034) is turned to the Off position.

After 24 VDC power is restored to the +1 and –1 wires, relay R1 automatically energizes to restore

the system to normal operation.

3.53 Alarm Sources - Alarms are generated from three sources. The Well House General alarm

(line 4050) is generated from the Well House control system. Alarms shown from lines 4075

through 4207 are generated from panel CP-1 at the Treatment Plant. The third source is SPC-11

(lines 4058 and 4066) which generates High/Low Water Tank alarms that are paralleled with water

tank High/Low float switches (lines4062/ 4069) for a shared alarm source.

3.53.0 24VAC Power Failure Alarm – This alarm occurs when relay R11 (line 4306) is turned

off by the loss of 24VAC power from CPT-2 (Bus B/C). This alarm is annunciated by R11B at

the Annunciator Panel/Remote Light Box (line 4034) as an audible alarm and as a visual

alarm (lines 4031 through 4036), at CP-1 (line 4038) as a visual alarm only and by R11E at

the Autodialer No. 2 (lines 2148/4378).

3.53.1 24VDC Power Failure Alarm – This alarm occurs when relay R1 (line 4025) is turned

off by the loss of 24VDC power from PS1 (Bus +1/-1). This alarm is annunciated by R1B (line

4029) at the Annunciator Panel/Remote Light Box as an audible alarm and as a visual alarm

(lines 4031 through 4036), at CP-1 (line 4038) as a visual alarm only and by R1C at the

Autodialer No. 2 (lines 2146/4374).

3.53.2 Aeration Basin No.1 High Level Alarm – This alarm occurs when relay contact R89D

(line 1576/4134) in CP-1 panel closes due a high water condition in the basin. This alarm is

annunciated as a General alarm as described above under section Annunciator Alarm System



Operation (relays R6 and R7 energize). It also turns on an Annunciator indicating light, IL12

(line 4134) and a Remote Light Box light, LED12 (line 4136).

3.53.3 Aeration Basin No.2 High Level Alarm – This alarm occurs when relay contact R91D

(line 1583/4141) in CP-1 panel closes due a high water condition in the basin. This alarm is




3.53.4 ATS Transferred Alarm – This alarm occurs when relay contact R109A (line

1658/4179) in CP-1 panel closes due the ATS (Automatic Transfer Switch) in the Treatment

Plant building shifting position from the normal source of power to the backup emergency

generator. This alarm is annunciated as a General alarm as described above under section

Annunciator Alarm System Operation (relays R6 and R7 energize). It also turns on an

Annunciator indicating light, IL17 (line 4179) and a Remote Light Box light, LED17 (line 4181).

3.53.5 Blower Failed Alarm – This alarm occurs when relay contact R70A (line 1507/4115) in

CP-1 panel closes due a low pressure condition in the discharge of any of the Aeration No.1 &

2 and Digester Blower No.1 & 2 Fans in the Treatment Plant. This alarm is annunciated as a

General alarm as described above under section Annunciator Alarm System Operation (relays

R6 and R7 energize). It also turns on an Annunciator indicating light, IL11 (line 4115) and a

Remote Light Box light, LED11 (line 4117).

3.53.6 CP-1 General Alarm – This alarm occurs when relay contact R111D (line 1799/4207)

in CP-1 panel closes due a General alarm condition in CP-1 in the Treatment Plant. This

alarm is annunciated as a General alarm for the Annunciator as described above under

section Annunciator Alarm System Operation (relays R6 and R7 energize). It also turns on an




3.53.7 Fire Alarm – This alarm occurs when relay contact R125D (line 1675/4200) in CP-1

panel closes due a Fire alarm condition in the Treatment Plant Lab room. This alarm is




3.53.8 Generator Running Alarm – This alarm occurs when relay contact R48D (line

1415/4108) in CP-1 panel closes due the Emergency Generator running in the Treatment

Plant Equipment room. This occurs whenever the generator is running in either test mode or

if the normal source of power has been lost to the Treatment Plant. This alarm is annunciated

as a General alarm as described above under section Annunciator Alarm System Operation

(relays R6 and R7 energize). It also turns on an Annunciator indicating light, IL10 (line 4108)

and a Remote Light Box light, LED10 (line 4110).

3.53.9 Intrusion Alarm – This alarm occurs when time delay relay contact TD40D (line

1677/4193) in CP-1 panel closes due an unauthorized entry into the Treatment Plant building

at one of the two entry doors into the Lab room. This alarm can also occur if an authorized

entry was made but the detection system was not turned off in time to prevent an alarm. This

alarm is annunciated as a General alarm as described above under section Annunciator

Alarm System Operation (relays R6 and R7 energize). It also turns on an Annunciator

indicating light, IL19 (line 4193) and a Remote Light Box light, LED19 (line 4195).

3.53.10 RAS Pumps Failed Alarm – This alarm occurs when relay contact R112D (line

1666/4155) in CP-1 panel closes due a failure of one of the two RAS pumps in the Treatment

Plant. This alarm is annunciated as a General alarm as described above under section





3.53.11 SCO-01 Clarifier Drive Over Torque Alarm – This alarm occurs when relay contact

R93A (line 1590/4148) in CP-1 panel closes because of an over torque condition in the

clarifier arm located in the Treatment Plant. This alarm is annunciated as a General alarm as

described above under section Annunciator Alarm System Operation (relays R6 and R7

energize). It also turns on an Annunciator indicating light, IL14 (line 4148) and a Remote

Light Box light, LED14 (line 4150).

3.53.12 Septic Tank High Level Alarm – This alarm occurs when relay contact R73A (line

1519/40194) in CP-1 panel closes because of a high level condition the site septic tank. This




3.53.13 Septic Tank Low Level Alarm – This alarm occurs when relay contact R71A (line

1515/4101) in CP-1 panel closes because of a low level condition the site septic tank. This




3.53.14 Septic Tank Pump STEP-01 Failed Alarm – This alarm occurs when relay contact

R75F (line 1525/4075) in CP-1 panel closes because of a low flow condition when the pump

was running. This alarm is annunciated as a General alarm as described above under section



3.53.15 Septic Tank Pump STEP-02 Failed Alarm – This alarm occurs when relay contact

R78F (line 1535/4081) in CP-1 panel closes because of a low flow condition when the pump

was running. This alarm is annunciated as a General alarm as described above under section





3.53.16 Ultra-Violet (UV) System Failed Alarm – This alarm occurs when relay contact R103A

(line 1626/4162) in CP-1 panel closes because of a controller failed contact closure in the UV

system controller. This alarm is annunciated as a General alarm as described above under

section Annunciator Alarm System Operation (relays R6 and R7 energize). It also turns on an


3.53.17 Water Tank High Level Alarm – This alarm occurs when contact AL-2 in setpoint

controller SPC-11 (line 4267) or a float switch (line 4062) in the water tank closes because of

a high water level condition in the Well House Water Tank. This alarm is annunciated as a



Remote Light Box light, LED4 (line 4060). In addition, relay R4 (line 4056) is energized

closing its R4A contact (line 4313) which in turn energizes relay R8 (line 4313). Relay contact

R8A opens to turn off the Well Pump Call signal, contact R8D (line 4338) closes to send a

high level alarm signal to Scada and contact R8F (line 4358) closes to send a high level signal

to the Autodialer No. 1 in CP-1.

3.53.18 Water Tank Low Level Alarm – This alarm occurs when contact AL-1 in setpoint

controller SPC-11 (line 4267) or a float switch (line 4069) in the water tank closes because of

a low water level condition in the Well House Water Tank. This alarm is annunciated as a



Remote Light Box light, LED5 (line 4068). In addition, relay R5 (line 4064) is energized

closing its R5A contact (line 4315) which in turn energizes relay R9 (line 4315). Relay contact



R9A closes to turn on the Well Pump Call signal, contact R9D (line 4342) closes to send a low

level alarm signal to Scada and contact R9F (line 4362) closes to send a low level signal to

the Autodialer No. 1 in CP-1.

3.53.19 Well House General Alarm – This alarm occurs when an alarm contact in the Pump

House (line 4053) closes because of a General alarm condition in the Well House. This alarm

is annunciated as a General alarm as described above under section Annunciator Alarm

System Operation (relays R6 and R7 energize). It also turns on an Annunciator indicating

light, IL3 (line 4050) and a Remote Light Box light, LED3 (line 4052). In addition, relay R3

(line 4048) is energized closing its R3A contact (line 4331) which sends an alarm signal to

Scada and contact R3C also closes to send an alarm signal to the Autodialer No. 1 in CP-1.

3.53.20 Spare Alarm Circuits – The Annunciator Panel has spare alarm circuits installed that

can be used for additional alarms should the need arise. Starting at line 4223 and continuing

through line 4246, 4 spare alarm circuits are available for use with each circuit being complete

with all components required to operate the Annunciator General Alarm system.

However, to enable a Scada or Autodialer No. 2 alarm, additional relays would need to be

installed. As an example, relay R3 (line 4048) was added to the Well House General alarm to

enable an alarm signal to Scada at line 4331 with its R3A contact.

4.0 REMOTE LIGHT BOX

4.10 Remote Light Box Overview

The Remote Light Box has no control located in it other than the alarm silence switch (SS2 line

4034) described above in sec. 3.51 Alarm Overview for the Remote Annunciator Panel. Indicating

LED lights are paralleled from the red indicating alarm lights in the Remote Annunciator Panel at

lines 4036 through 4246. For a description of alarm light operation, reference sec. 3.51 and 3.52



above. An exception to the alarm light operation described above is LED1 (line 4022) which

monitors 24VDC power on the Remote Annunciator Panel control system.

The Remote Light Box has a Water Tank Level digital display mounted the door of the panel in the

upper right portion of the door. The meter gives a continuous indication of the level of water in the

tank and reads from 0 to 23.1 ft. of water. Should the meter be suspect of inaccuracy, it may need

to be recalibrated. Reference the Calibration Manual instructions, section 1.22.


gifford, operation instructions

Documents

Transcript of gifford, operation instructions