ZTE ZBTE Series - GE...

GE EnergyDigital Energy

Zenith

ZTE/ZBTE SeriesTransfer Switches40-4000 Amps

Operation & Maintenance Manual

Authorized Service

For GE parts and service call: 1 + 800 637-1738, option #3 or 1 + 773 299-6600

Table of Contents

Introduction, Safety & Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Installation

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Inspection Prior to Initial Energization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Initial Testing & Energization of the SwitchManual Testing of Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Electrical Testing of the Switch (Source 1 = utility, Source 2 = generator) . . . . . . . . . . . . . . . . . . . 5

The Control Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5The MX350 Controller

The MX350 Graphical Display & Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Switch Exerciser. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Controller Power Supply (UTA – Universal Transformer Assembly) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Sequence of Operation for Bypass/Isolation Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Troubleshooting & Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Maintenance & Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Information subject to change without notice. Please verify all details with GE.

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 1 91R-1000

Introduction, Safety & Storage

GE transfer switches are used to provide a continuoussource of power for mission, process and healthcarecritical loads by automatically transferring from a pre-ferred source of power Source 1 (or Normal Source) to anon-preferred alternate Source 2 (or Emergency) powersource (typically a generator) in the event that Source 1operational parameters fall outside preset limits.

Voltage and current sensing and system controls areperformed via a state-of-the-art microcontroller locatedon the cabinet door. It is designed to give highly accuratecontrol of the transfer switch system.

All GE transfer switches are designed for use on emergencyor standby systems and are rated for total system or motorloads. Transfer switches are UL listed under Standard1008 and CSA certified under Standard C22.2 No. 178.

The safe operation of your switch at all times is GE’s focus. It must be recognized that hazardous voltages andcurrents can exist during normal operation and anymaintenance on the transfer switch must be performedutilizing appropriate safety measures. Installation,

adjustment, maintenance or removal of the switch mustonly be carried out by qualified personnel with all powerto the switch turned off. It is recommended that onlyqualified electricians be allowed to install or providemaintenance on the switch.

Regarding the switch itself, proper storage, installation,operation and maintenance will help increase its operationallife. Upon initial receipt of the transfer switch, inspect forany damage. This includes damage to the enclosure, powerpanel, control panel and wiring harnesses. If any damageis found or suspected, file a claim as soon as possiblewith the carrier and notify the nearest GE representative,or call 1 + 800 637-1738 or 1 + 773 299-6600.

Prior to installation store the transfer switch in a clean drylocation, protected from dirt and water. Provide ample aircirculation and heat, if necessary, to prevent condensation.See Table 1 for recommended storage and ambientoperating temperatures.

CAUTIONDue to hazardous voltages and currents, GE recommends

that a GE Certified technician or a qualified electrician perform the installation and maintenance of the switch.

!

DANGERHAZARDOUS VOLTAGE CAN CAUSE

SEVERE INJURY OR DEATHTurn OFF all power before installation, adjustment or removal of transfer switch or any of its components.

!

NOTEA protective device such as a molded case circuit breaker orfused disconnect switch MUST be installed on both sources of

incoming power for circuit protection and as a disconnect device.

All references made within this manual about the terms“Source 1”, “S1” or “Preferred Source” relate to a “Normal”

power source (typically from a utility source). References made to“Source 2”, “S2”, “Non-preferred Source” or “Alternate Source”relate to an Emergency Source (many times a generator).

Table 1Storage and Operating Ambient Temperatures

5% to 95%(non-condensing)

-30°C to +75°C (-22°F to +167°F)

40-400 AMP(molded shell)-20°C to +65°C(-4°F to +149°F)

40-4000 AMP(all other frameand panel types)-20°C to +60°C(-4°F to +140°F)

StorageTemperature Humidity

OperatingTemperature(Ambient)

Figure 1Method of Moving Transfer Switch

NOTE: When lifting the switch using a spreader bar, height Hmust be equal to half of distance D.

91R-1000 Page 2 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Installation

When preparing to install the transfer switch, review thedocumentation included with the unit. Each GE transferswitch is factory wired and tested. A complete documen-tation package is furnished with each switch, providingdescriptions and schematics for the following:

a. Standard and non-standard control interface signals and options.

b. Sequence of operations.c. Standard indicators, pushbuttons and annunciators.d. Controller failure and return settings and time delays.e. Description of the programmable engine exerciser.f. Standard programmable control of switch operation.g. User-configurable input and output.h. System schematics:

1. Overall switch system.2. Universal transformer assembly (UTA) power supply.3. Transfer switch device layout.4. Transfer switch power panel layout.5. Interconnect plugs.6. Customer connection wiring.

MountingAdequate lifting means must be used to mount thetransfer switch into place. The recommended methodfor moving the ATS using lifting eyes, where supplied, anda spreader bar is illustrated in Figure 1. Enough roomshould be allowed to open the cabinet door(s) fully forinspection and servicing of the switch per NEC andlocal codes.

Inspection Prior to Initial EnergizationPrior to energizing the transfer switch, perform the following:

1. With a vacuum, remove any debris collected onthe switch during shipment or installation.

2. Check engine start connections. The engine-startterminals are located on terminal block positions 1 through 3 (see Figures 2 and 3). The E contactprovides the engine start signal from the automatictransfer switch controller to the genset. The terminalblock has two sets of A3 (Source 2 position) normallyopen contacts (NO) and two sets of A4 (Source 1position) NO contacts.

3. Verify the correct connection of all control wires.

4. Check settings of all timers and adjust as necessary.5. Adjust any optional accessories as required.6. Verify that all Source 1, Source 2 and Load cables

are correctly connected to the clearly marked terminals on the unit.

7. Verify from Table 2 the number and sizes of cablelugs, which are supplied as standard per the switchamperage rating. Most transfer switches are sup-plied with UL listed solderless screw-type terminalsas standard for the Source 1, Source 2 and Loadpower connections.

8. Verify equipment ground cable(s) are installed per NEC and/or local codes.

9. Verify that all cable lug connections are tightenedin accordance with torque values in Table 3.

10. Remove surface oxides from cables by cleaningwith a wire brush.

11. Make sure that all covers and barriers are installedand properly fastened.

NOTEPower panels ship from GE connected to Source 1.

NOTEAll control wires (18-12 AWG) must be

torqued to 19 in/lbs (1.6 lb-ft) (2.2 N-m)

CAUTIONBefore drilling conduit entry holes or any accessory mounting

holes, cover and protect the switch and control panel toprevent dirt and metal fragments from entering the

mechanical and electrical components of the switch.

Failure to do so may result in damage and malfunction of the switch and void the warranty.

!

Table 2Power Connections: Screw Type Terminals for External Power Connections

Switch Size (Amps)Source 1, Source 2 & Load Terminals Neutral Bar (When Required)

Cable Per Pole Range of Wire Sizes No. of Cables per lug Range of Wire Sizes40 1 #8 AWG to 1/0 3 #8 AWG to 1/0

80 1 #8 AWG to 1/0 3 #8 AWG to 1/0

100 1 #8 AWG to 1/0 3 #8 AWG to 1/0

150 1 #8 AWG to 3/0 3 #8 AWG to 300 MCM

225 1 #6 AWG to 250 MCM 3 #6 AWG to 300 MCM

260, 400 1 #4 AWG to 600 MCM 3 #4 AWG to 300 MCM

600 2 #2 AWG to 600 MCM 8 #2 AWG to 600 MCM

800, 1000, 1200 4 #2 AWG to 600 MCM 12 #2 AWG to 600 MCM

1600, 2000, 3000, 4000 Line, Load and Neutral terminals are located in the rear of switch and arranged with bare bus bar


Table 3Tightening Torque for Lugs

Figure 2Typical Switch Component Arrangement Inside Enclosure1200-1600A Bypass Shown Below

Terminal Block (TB)(Engine start contact terminals,source 1 and 2 position contacts)

Input Relay (typ.)

Universal Transformer Assembly (UTA) Power Supply

ATSPowerPanel

Backside of MX350 Graphical Control Panel

MX350 Modular Controller (CPU, powersupply, sensing CT card, I/O cards, etc.)

DisconnectSwitch (DS)

Load

CurrentTransformer (CT)

BlockSource 2

Source 1

Socket Size Across Flats Torque

in mm lb-in lb-ft N-m1/8 3 45 4 5

5/32 4 100 8 11

3/16 5 120 10 14

7/32 5.5 150 12 17

1/4 6 200 17 23

5/16 8 275 23 31

3/8 10 375 31 42

1/2 13 500 42 56

9/16 14 600 50 68

Bypass IsolationATS Power Panel

Output Relay (typ.)


Figure 3Representative Schematic of Terminal Board, Output Strip and Input StripRefer to Electrical Schematic Drawing for additional details

CUSTOMER USEA1 OUT5 11

MX3

50 C

ON

TRO

LLER

TO L

-CA

RD S

LOT

“G” O

N

G OUTPUT STRIP

OUTPUT-512A2 14

5-3

5-2

L5L6

L4L3L2L1

G2

G6

G4

G5

G3

J8G1

800802

J7

2

1

-

+

OUTPUT-4

FACTORY USED (FOR ALARM)

FOR CUSTOMER USESTATUS OUTPUT CONTACTSHUNT TRIP EMERG. BKR.

LOAD SHEDSTATUS OUTPUT CONTACTFOR CUSTOMER USE

GE ZENITH

12

12

OUT4A1

A2

OUT3A1

A2

14

11

11

14

CONTROLS

12

12

A1 OUT1

OUT2A2

A1

A2

11

14

11

14

802

4-2

4-3

5-1

4-1

3-3

3-2

2-3

3-1

1-3

2-2

1-2

2-1

1-1

(-)

OUTPUTCONTACTS FOR

CONFIGURABLE

OTHERS

G INPUT STRIP

L9

MX3

50 C

ON

TRO

LLER

TO L

-CA

RD S

LOT

“G” O

N

L13L14

L12L11L10

G9

G13G14

G12

G10G11

L7L8

802800

J6

G8G7

1

2

J5

-

+ (SUPPLIED BY OTHERS)

(SUPPLIED BY OTHERS)

(SEE NOTE 3)

(SEE NOTE 4)

(SEE NOTE 8)

CCNO

12

12

12

IN7A2

A1

IN5

IN6A2

A1

A2

A1

14

11

14

11

14

11

COM

13

12

25ZA

NO

NO

CC

CC

IN1 11A1

12

12

12

12

IN3A1

IN4A1

A2

A2

IN2A1

A2

A2

11

11

14

14

11

14

14

GE ZENITHCONTROLS

11

10

9

7

8R15

NO

NO

CC

CC

Q2

DS

NO C

FOR

CU

STO

MER

USE

CO

NFI

GU

RAB

LE IN

PUTS

OPT

ION

PAC

KAG

E

OTHERS

COM

COM

CONNECTIONS OF THE TRANSFER SWITCH.COMPONENTS DRAWN IN DASHED LINES ARE OPTION PACKAGE AND CUSTOMER

Q2 (TEST WITH LOAD) IS PROVIDED AS STANDARD (PRE-CONFIGURED) FEATURE.R15 (LOAD SHED) IS PROVIDED AS AN OPTION (PRE-CONFIGURED) FEATURE.

ATS SHOWN IN SOURCE-1 POSITION WITH NO POWER AVAILABLE.

UNLESS OTHERWISE SPECIFIED ALL CUSTOMER CONNECTION WIRES TO BE #14 AWG.,

OUTPUT STRIP CONTACTS ARE RATED 10 AMPS AT 30VDC/250VAC.ENGINE START CONTACT IS RATED 10 AMPS AT 28VDC/120VAC.600V.

6.7.

5.4.3.

2.1.

NOTES

8. ENGINE START CONTACT MAY BE ON SEPARATE TERMINAL BLOCK FOR BYPASS SWITCHES. REFER TO ELECTRICAL SCHEMATIC FOR TERMINAL LOCATION.

GE OTHERS

A4-1

A3-1

A3-2

CARD8

K8

C

C

C

7

9

E12

E11

E13

NO

NO

NO

A3-2

CA3-1

A3-1

CA4-1

A4-1

CA3-2

A4-2C

AUX

NO

CA4-2

A4-2

CLOSED IN SOURCE 2 POSITION.(2) NORMALLY OPEN CONTACTS.

FOR CUSTOMER USE.

FOR CUSTOMER USECONTACT

EENGINE START CONTACT

(2) NORMALLY OPEN CONTACTS

TB

FOR CUSTOMER USE.HELD CLOSED IN SOURCE 1 POSITION

CARDK

TB

ENG. START

98

8 7

8 9

PA3 TP1E11

E13

E12

NO

NO

NO

NO

NO

NO

C

AB4-5

AB3-6C

C

A3-1C

A4-1

A3-2

C

A4-2C

CA3-1

101

100

A3-1

CA3-2

99

CA4-1

CA4-2

A3-2

A4-1

A4-2AUX

GE OTHERS

(2) NORMALLY OPENCONTACTS, HELD CLOSED INSOURCE 1 POSITION FORCUSTOMER USE. SEE NOTE 1

(2) NORMALLY OPENCONTACTS, CLOSED INSOURCE 2 POSITIONFOR CUSTOMER USE.

IS IN SOURCE 1 POSITION.CONTACT CLOSED WHEN BYPASS

FOR CUSTOMER USE.CONTACT CLOSED WHEN BYPASSIS IN SOURCE 2 POSITION.FOR CUSTOMER USE.

CONTACTE

FOR CUSTOMER USEENGINE START CONTACT

Non-Bypass ATS Bypass ATS


Initial Testing and Energization of the Switch

Manual Testing of MechanismA manual operator handle is provided with the transferswitch for maintenance purposes only. Manual operationof the switch must be checked before it is operatedelectrically. All power sources must be disconnectedbefore manual operation of the switch is attempted.Insert the handle and operate the transfer switch betweenthe Source 1 and Source 2 positions. The transfer switchshould operate smoothly without binding. After insuringthe switch mechanically transfers adequately, returnthe switch to Source 1 position, remove the handle and return it to the holder provided.

Before proceeding, refer to the information packagesupplied with the ATS. Read and understand the information on all accessories installed.

Figure 4Transfer Switch Equipment Rating Nameplate (Typical)

AUTOMATIC TRANSFER SWITCH FORUSE IN EMERGENCY SYSTEMS

Model Number: Z3003S1AA50XXXXXXXSerial Number: 1598248-2BOM Number: ZB1SD20031-05A600X

RATINGVolts: 480 Hz: 60Amps: 2000 Phase: 03

LISTED382HE23911



!

WARNINGAll power sources must be disconnected before manual operation of the switch.

!

Electrical Testing of the Switch (Source 1 = utility, Source 2 = generator)To verify the electrical system and proper automaticoperation of the switch, perform the following steps:

CHECKING SOURCE 1 (PREFERRED SOURCE)1. Check to make sure the switch is connected to

Source 1 position.2. Turn the Disconnect Switch (DS) to INHIBIT. This

prevents the switch from transferring or sending astart signal to the Source 2 generator unintentionally.

3. Verify that the switch rating is the same as the system voltage from Source 1 supply power. The equipment rating nameplate on the transferswitch lists the voltage (see Figure 4).

4. Close the Source 1 input circuit breaker.5. Confirm that the MX350 controller is sensing

Source 1 voltage. The S1 LED should be illuminated.Electrical parameters (including phase rotation)can be viewed on the MX350 Graphical ControlPanel on the \Value\Summary and \Diag\Phasorscreens. Verify that the system voltage is correct forthe rating of the switch.

CHECKING SOURCE 2 (NON-PREFERRED OR ALTERNATE SOURCE)6. Close the Source 2 input circuit breaker.7. Manually start Source 2 via controls on the generator

itself. Note that with the DS in INHIBIT position, thegenerator cannot be started by the MX350 controller.

8. Confirm that the MX350 controller is sensingSource 2 voltage. The S2 LED should be illuminated.Electrical parameters (including phase rotation)can be viewed on the Graphical Control Panel onthe \Value\Summary and \Diag\Phasor screens.

9. Verify that the phase rotation of Source 1 is thesame as the phase rotation of Source 2.

10. Manually shut down the generator via controls onthe generator itself.

CAUTIONEnergizing a transfer switch with dissimilar

system voltage from that which the ATS is rated may cause equipment damage.

!


CHECKING THE SWITCH’S ABILITY TO TRANSFER11. Turn the DS to AUTO position. This allows the MX350

controller to send a start signal to the generator.12. Perform a System Test. The options available are

(a) Fast Test (test with load without time delays),(b) Xfer Load and (c) No Xfer (test without load, gen-erator start only). The test(s) can be initiated by thegreen TEST button on the Graphical Control Panel.

13. After completing electrical tests, close and lock theenclosure, including all small quarter-turn locks onthe enclosure door.

Electrical testing of the switch is further discussed inthe manual MX350 Automatic Transfer Control System(Publication Number 1601-9071-A1).

The Control Connections

The ZTE and ZBTE lines of transfer switches are designed formaximum flexibility and ease of installation. As illustrated inFigure 2, the MX350 controller input/output and meteringmodules, graphical control panel and power suppliesare mounted on the enclosure door. All terminal connec-tions for the engine start, switch position contacts, inputand output relays are typically just inside the cabinet onthe right side for ease of accessibility. Configurableinput and output relays are PCB board mounted on DINrail in combinational arrays of 5 inputs and 7 outputs. A“Field Connection Diagram” (see the example in Figure5) is affixed on the cover of the universal transformerassembly (UTA) power supply for easy reference. Thisdiagram provides the factory-supplied terminal boardconnections as well as dry contact inputs and outputsidentified by terminal number as defined in the MX350controller. The terminal board and I/O connections areschematically shown in Figure 3. Close-up photographsof an input and output PCB with terminal connectionsare shown in Figures 6 and 7.

The number of PCB-mounted input and output relayassemblies equals the number of “L cards” on themicrocontroller, more formally termed “IO_L modules.”The assembly of output relays is GE part number 50P-3042.The input relay assembly is GE part number 50P-3041. Ifthe microcontroller has one L card, then there will beone pair of GE Part Number 50P-3041 and 50P-3042 PCBcombinations mounted on the DIN rail inside the enclosure.For two L cards, there will be two sets of input and outputstrips. The maximum combination is three pairs of I/Ostrips (that is, a total of six relay DIN rail mounted PCBs).

The controller automatically recognizes the physicallocation of the input or output relays via an alpha-numericidentification system. The first set of output relays arenamed G1 through G5 while the input relays are identifiedas G7 through G13. If a second L card exists in the micro-controller, the second PCB-mounted assembly output relaysare named H1 through H5; the outputs are H7 throughH13. Similarly, a third IO_L module is related to inputsI1 through I5 and outputs I7 through I13 (see Table 4).

CAUTIONCertain accessories, per specific schematics, can inhibit

automatic transfer. Engine Genset could start when enginecontrol wires are attached.

!

NOTEA periodic test of the transfer switch under load conditions

is recommended to insure proper operation. (See National Electric Code articles 700 and 701)

Terminal Terminal Terminal TypeG1 H1 I1 OutputG2 H2 I2 OutputG3 H3 I3 OutputG4 H4 I4 OutputG5 H5 I5 OutputG6 H6 I6 Common for outputsG7 H7 I7 InputG8 H8 I8 InputG9 H9 I9 InputG10 H10 I10 InputG11 H11 I11 InputG12 H12 I12 InputG13 H13 I13 InputG14 H14 I14 Common for inputs

Table 4IO_L Module Connections

Terminals G7 and G8 are always used for DS and Q2 functions, respectively, and cannotbe adjusted. Depending on the type of switch and features ordered, Terminals G1 throughG5 as well as G9 through G13 may not be available for customer configuration. Seeelectrical schematic.


Figure 5Example of Field Connection Diagram

Notes: 1. See Field connection wiring diagram for additional wiring details.2. Controller inputs and outputs are field reconfigurable. “Factory Settings: indicate configuration at time of shipment.3. From MX350 Display, go to \HOME\INPUTS or \HOME\OUTPUTS to see current configuration.4. Record user configuration in “Field Setting” area below.

Name Term # Description

TB Strip 15 Connected to Source 1 (NO)

14 Connected to Source 1 (Common)

13 Connected to Source 1 (NO)






7

6

5

4

3 Engine Start – NC

2 Engine Start – Common

1 Engine Start – NO

G InputStrip

G 7 Disconnect Switch (DS) Factory UseOnly

G 8 Test with Load (Q2) Factory UseOnly

G 9 Load Shed from S2 (R15) Factory UseOnly

G 10 Bypass Xfer Time Delay to S1

G 11 Inhibit Xfer to S2 (Q3)

G 12 Inhibit Xfer to S1 (Q7)

G 13 Engine Start (SW1)

Com +24VDC Factory UseOnly

Name Term # Factory Setting Field Setting

G OutputStrip

G 1 (NO/NC/Common) Load Shed from S2 (R15) Factory Use

Only

G 2 (NO/NC/Common) Alternative Source Fail to Start

G 3 (NO/NC/Common) S1 Failure

G 4 (NO/NC/Common) S2 Failure to Connect

G 5 (NO/NC/Common) Load Control 1

Name Term # Description

TB Strip 12 Connected to Source 1 (NO)








4 Bypass in Source 1 (NO)

3 Bypass in Source 1 (Common)

2 Bypass in Source 2 (NO)

1 Bypass in Source 2 (Common)

3 Engine Start – NC

2 Engine Start – Common

1 Engine Start – NO

Non-Bypass ATS Bypass ATS

Input 7Position 1

Input 8Position 2

Input 9Position 3

Input 10Position 4

Input 11Position 5

Input 12Position 6

Input 13Position 7

CommonPosition 8

CommonPosition 9

CommonPosition 10


Output 11 = NO2 = NC3 = common





Figure 7Input Strip and Connections (GE Part Number 50P-3041)

Figure 6Output Strip and Connections (GE Part Number 50P-3042)


Figure 8MX350 Graphical Display Components

The MX350 Controller

The MX350 microcontroller is a modular control andmonitoring system designed specifically for low-voltagetransfer switch applications. The MX350 provides thefollowing key benefits:

• Flexible control and communication options to suitany low-voltage transfer switch application.

• Small footprint.• Modular design, which reduces the number of spare

components for maintenance and testing.• Integrated pushbuttons and LED indicators which

reduce required external components and wiring• Multiple communication protocols which permit simple

integration into monitoring and control systems.• A graphical control panel that provides local control

and access to system information.

Detailed technical information on the MX350 controlleris described in the manual MX350 Automatic TransferControl System (Publication Number 1601-9071-A1).

The MX350 Graphical Display and KeypadThe MX350 controller features a ¼ VGA color graphicaldisplay with status LEDs, an USB programming port andmenu-driven soft keys (see Figure 8) as well as dedicatedcontrol and navigational keys. Each display page, inturn, consists of three components: (1) a header bar, (2) the selected page and (3) soft-key labels (Figure 8).

The header bar displays the hierarchical path name, thedate and time and the current password access level.The soft-key labels are indicated on the bottom line.Soft-keys are used for navigation, performing functionsand for acknowledgement transactions. Soft-keys labels

change to show relevant selections for the displayedscreen. The color of each soft-key label indicates itsfunctionality. Soft-keys are highlighted for the displayedpage, unauthorized keys are “greyed-out”, and unusedkeys are not displayed.

The control panel LEDs summarize the status of thetransfer switch, including the following indications:• ALARM: indicates that there is a problem with the ATS

or that a user configurable alarm condition is active.• TD DELAY: indicates that the controller is timing before

taking the next control action.• XFER INHIBIT: indicates that the controller will not

automatically transfer to the other source and thatoperator intervention is required to allow transfer.

• S1 (Source 1) Available LED: indicates that S1 power is present and within user defined limits.

• S2 (Source 2) Available LED: indicates that S2 power is present and within user defined limits.

• S1 (Source 1) Status LED: indicates that the load isconnected to S1 power.

• S2 (Source 2) Status LED: indicates that the load isconnected to S2 power.

The MX350 controller page hierarchy is shown in Figure 9.

Operation Setpoints and User-Configurable Inputs and OutputsOperation setpoints define the acceptable electrical andtime limits for both Source 1 and Source 2. These set-points define dropout and restore values for over andundervoltage, over and under frequency, as well as theassociated time delays. Tables 7 and 8 provide typicalparameter settings for operation setpoints and timers.


Figure 9MX350 Graphical Display Page Hierarchy

Amps

Power

Volts

PQ

Values

Inputs

Outputs

System

Message

Flex

Summary

Status Reset

Operation

Control

Security

ConfigSetpoints

Phase B

Phase C

Phase A

Phase A

Phase B

Phase C

Phase A

Phase B

Outputs

Comms

System

Events

Zenith

Waveform

Faults

Alarms

Control

Stats

Phasors

About

Events

Report

Diag

ATS

CT-VT

Inputs

Virtual

Waveform

Datalog

Phase C

V1 Harm

V2 Harm

I Harm

Summary

V1 Harm

V2 Harm

I Harm

Summary

V Inputs

V Outputs

S1 Setting

S2 Setting

Timers

General

Interlock

Alarms

Reset

Setup

Main menu Level 3Level 2Level 1

ExerCancel

InfoExerciser

Datalog

Test


Switch ExerciserThe MX350 controller has a built-in exerciser that canbe enabled and set up from the \Exerciser\Info screen.This feature allows the user to test the system periodi-cally or to setup a schedule for operating the systemperiodically in order to minimize utility costs.

From the \Exerciser\Info screen the operator can accessall required setup parameters for scheduling exercises.It also indicates as to when the last exercise took placeand when the next exercise will be performed.

The \Home\Exerciser\Setup page displays the MX350Exerciser parameters as shown in Figure 10. Exercise typeand schedule are user-defined here for starting time,duration of exercise and whether or not the switch is totransfer the load. The mode of operation of the exerciserfunction can be selected with a time base of 1 day, 1 week,14 days, 28 days, or 365 days. With a time base of 365days, up to 24 events can be scheduled. With all othertime bases, the number of exercise events is limited to 7.

Figure 10Exerciser Values on Home\Exerciser\Setup Page

For each exercising event, the operator enters a start timeas well as a time of duration. In addition, the operator canselect the type of exercise as ‘Genstart and Transfer’ oras ‘Genstart only’. When the ‘Gen Start only’ mode isselected, the controller will start the engine, but does notactually transfer the load. In this mode, the readiness forthe engine generator set is tested. It does not test thefunctionality of the Automatic Transfer Switch itself. Inthe ‘Gen Start and Transfer’ mode, the controller startsthe engine and actually transfers the load to the alter-native source. This mode can be used to test the integrityof the emergency power system. It can also be used tosetup a schedule for times of operation when the switchload will run on an alternative power supply. This couldbe done, e.g., to avoid demand charges from a utilitycompany. If the operator chooses to abort an ongoing test,there is a ‘Test Cancel’ button on the \Exerciser\Infoscreen. This screen also contains a ‘Test’ button thatwill take the user directly to the Test screen.

The \Home\Exerciser\Test page displays the MX350system test choices, as shown in Figure 11. From theTest screen the user can perform the same operationsas performed by the exerciser. Whereas exercises are performed automatically, a Test always has to be initiated by the user.

Figure 11System Test Choices on Home\Exerciser\Test Page

There are three types of tests: Fast Test, Xfer Load, andNo Xfer. The screen also provides an END button to abortany of the three test types. To test the functionality ofthe switch the operator can use the Fast Test option.With this kind of test, the engine generator will startand the load will transfer without going through anytime delays. In order to simulate a load transfer as if anoutage was occurring, the operator can select the XferLoad test. With this test type, the engine will start upand the load will transfer according the time delay ofthe W timer. When the test is ended (by depressing theEND button), the switch will go through the U timerdelay before actually transferring back to the utility.

Controller power supply (UTA – universal transformer assembly)

System line voltage is transformed to 170Vdc to powerthe MX350 controller and 24Vdc ungrounded to powerrelays via the universal transformer assembly (UTA).The power supply is termed “universal” because the sameunit handles all line voltages from 120Vac through600Vac via an internal six-position jumper array. Figure 12shows the external connections points for the UTA. TheUTA also features a 120Vac uninterruptible power supplyinput and 24Vdc input battery options. 120Vac and24Vdc (ungrounded) must be supplied together from anuninterrupted power source. In addition, test terminalsare included for transformer voltage monitoring (seeFigure 13 for connection point definitions and Figure 14for the UTA schematic).


Figure 12Connection Points for Universal Transformer Assembly (UTA)

Figure 13Connection Points on Test Plug for Universal Transformer Assembly (UTA)

120VAC Aux Input(customer supplied) (not obligatory)

(See Note 1)

24VDC output fromUTA to I/O relays

170VDC output from UTA to MX350 controller

Source 1 voltage input

Test points

Source 2 voltage input

24VDC Aux Input (ungrounded)(customer supplied) (not obligatory)

(See Note 1)

Plug position

Test pointPlug position

Test point

20

TP119 18

TP317 16

TP515 14

TP713 12

TP911

10 9

TP28 7

TP46 5

TP64 3

TP82 1

TP10

Plug position Test point Test Connection Points Value Measured

1 TP10 TP1-TP2 Line AC voltage input from Source 12 — TP2-TP3 Voltage drop across R13 TP8 TP4-TP5 24 VAC to output from Source 1 to input/output relays4 — TP6-TP7 Line AC voltage input from Source 25 TP6 TP7-TP8 Voltage drop across R26 — TP9-TP10 24 VAC to output from Source 2 to input/output relays7 TP48 —9 TP210 —11 —12 TP913 —14 TP715 —16 TP517 —18 TP319 —20 TP1

View looking into plug

UTAmetal cover

UTA PC board

Note 1: Both Aux inputs must be supplied from an uninterrupted powersource. Supplying only one Aux input may result in malfunction.


Figure 14Universal Transformer Box Assembly (UTA) Schematic

V_A R5

I/O’S

CUSTOMERUPS (120VAC)

OPTIONAL FOR KEEPINGTHE MX350 CPU ACTIVE

WITH LOSS OF SOURCE 1OR SOURCE 2 POWER

(SEE NOTE 1)

FROM

FROM TO MX350

CONTROLLER

CONTROLLERTO MX350

POWER SUPPLY (PS)

D18

D19

D20

-

+

+

-

OPTIONAL FOR KEEPING THE INPUT AND OUTPUT STRIPS ACTIVE WITH LOSS OF SOURCE 1 OR SOURCE 2 POWER (SEE NOTE 1)

NOTE 1: MUST BE SUPPLIED TOGETHER FROM AN UNINTERRUPTED POWER SOURCE

2

802

800

FROMCUSTOMER

BATTERY(24VDC)

(UNGROUNDED)

J4

1

2

1

+

-

170+

170-

J9

4

J12

2

3

1MOV3

V_B

D26

D22

D23

D24

-+

TROUBLESHOOTINGFOR SERVICETEST POINTS

REFER TOELECTRICAL

SCHEMATIC DWG.SHEET 4

D17

TO TP10

18

16

14

12

J6

3

111

1

5

7

TO TP9TO TP8

TO TP6TO TP7

TO TP5TO TP4TO TP3

2020

J310

9

31

30

3

1

Source 1AC Voltage

Source 2AC Voltage

J1

J2

21

20

3

1

V_A

V_B

TO TP2TO TP1

V_B

V_A

0TP3

TP4TP5

TP6TP7

TP6TP8

TP7TP8

TP9TP10

17VDC

D21

17VDC

120VAC

120VAC

0

JP1

JP2

JP3

TP1

TP1TP3

TP2

TP2

120VAC

120VAC

MOV2

MOV1

JP4

JP5

JP6

R4

R3

1

2

3

4

C1 MOV5

TP6

C2

12

11

R2

MOV4

D13

D14

D16

D8

D12

D4

D9

D10

~

+-

5

6

7

T2

1

2

3

4

31 10 12

5

6

7

T1

~R1

TP10TP1

7

TP7

9

TP9

12

11

D25

TP8

D6

D5

D8

D7

D4

D3

D2

D1

-+

TP5

TP2

7

9

TP4D25

TP3


Sequence of Operation

Automatic transfer switches transition from one sourceto a second source in three different ways: standard(also referred to as open), delayed and closed transition.Delayed transition switches have an intermediary mid-point location where the switch is not connected to eithersource when transferring to the non-preferred sourceafter a preferred source failure. For closed transition, bothsources are connected momentarily. Timers are utilizedto insure that sources are stable before transferring orto prevent a hurried, ultimately unnecessary transferwhen the apparently failed source was actually not ina state of failure.

When transferring with two good sources (either aretransfer back to Source 1 or a system test transfer),closed transition switches are momentarily connected to both sources for a period of less than 100 ms. The controller prevents transfer until Source 2 is in electricalsynchronism with the utility.

Sequence of Operation forBypass/Isolation Transfer Switch

An automatic transfer switch equipped with a bypass/isolation switch provides the ability to withdraw theautomatic transfer switch for testing and/or maintenancepurposes without interrupting the served load. The bypassmanual switch is the upper power panel while theautomatic switch is housed in the lower panel (seeMimic Bus and Indicator Lights Schematic in Figure 15).

Operation of the unit is quick and convenient, requiringonly one operator and less than one minute to complete.Instructions are mounted on the front of each isolationswitch door along with a mimic panel providing indicationof power source availability and bypass/ATS switchpositions.

The manual bypass switch is normally open on bothsources with the ATS feeding the system load. Duringoperation, the bypass switch is closed, paralleling theATS contacts which then allows withdrawal of the ATS tothe TEST or ISOLATE position. Mechanical and electricalinterlocks are included to prevent cross-sourcing orbypassing to a dead source.

In the TEST position, the ATS is disconnected from theload (which is instead powered through the bypasspanel). However, control power is available to the ATSto permit operational testing through the control panelof the transfer switch while removed from Source 1and Source 2.

In the ISOLATE position, the ATS is completely withdrawnand may be removed from the enclosure, if desired, formaintenance.

After the isolation operation, if the bypass is closed intoSource 1 and this source happens to fail, an auxiliarycontact on the bypass control will automatically startthe alternate generator source (Source 2). The manualhandle of the bypass may then be operated to transferthe load to Source 2. Interlocks guard against inadvertentmanual connection to an opposite source if the ATS is inthe circuit. Also, the reconnection of the ATS is preventedvia interlocks if the source positions don’t match.

Comparative sequences of operation for bypass/isolationtransfer switch as a function of rated amperage areshown in Figure 16.

Figure 15Bypass/Isolation Transfer Switch Mimic Bus and Indicator Lights Schematic

WARNINGWhile the bypass switch is out of the AUTO position/mode, the ATS is INHIBITED from automatic operation. Make certain the

ATS is left in automatic after completion of any service.

!


Vert

ical

Vert

ical

Hor

izon

tal

Vert

ical

Hor

izon

tal

Vert

ical

100-

400A

600-

1200

A16

00-3

000A

4000

ASw

itch

Pos

ition

Swit

ch P

ositi

on1.

Co

nfig

urat

ion

for

Auto

mat

icO

pera

tion

• M

anua

lly o

pera

ted

Byp

ass

Switc

h co

ntac

ts (B

N/B

E) a

re o

pen

• AT

S is

sup

plyi

ng lo

ad•

Dis

conn

ect

switc

h (D

S) is

in A

UTO

• M

anua

lly o

pera

ted

Byp

ass

Switc

h co

ntac

ts(B

N/B

E) a

re o

pen

• AT

S is

sup

plyi

ng lo

ad•

Dis

conn

ect

switc

h (D

S) is

in A

UTO

• M

anua

lly o

pera

ted

Byp

ass

Switc

hco

ntac

ts (B

N/B

E) a

re o

pen

and

ATS

is s

uppl

ying

load

• D

isco

nnec

t Sw

itch

(DS)

is in

Aut

o

• M

anua

lly o

pera

ted

Byp

ass

Switc

h co

ntac

ts (B

N/B

E) a

re o

pen

• AT

S is

sup

plyi

ng lo

ad•

Dis

conn

ect

switc

h (D

S) is

in A

UTO

2.

To B

ypas

sAT

S

• O

pen

bott

om c

abin

et d

oor

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to

INH

IBIT

• Po

sitio

n m

anua

l byp

ass

hand

le (M

BH)

to s

ame

pow

er s

ourc

e at

ATS

• O

pen

bott

om c

abin

et d

oor

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to

INH

IBIT

• Tu

rn B

ypas

s Se

lect

or S

witc

h (B

SS) t

o sa

me

pow

er s

ourc

e as

ATS

• Tu

rn D

S to

Inhi

bit

• O

pen

Bypa

ss Is

olat

ion

Acce

ss p

anel

• Tu

rn B

ypas

s Se

lect

or S

witc

h (B

SS) t

osa

me

pow

er s

ourc

e as

ATS

• Po

sitio

n M

anua

l Byp

ass

Han

dle

(MB

H) u

pwar

d

• O

pen

bott

om c

abin

et d

oor

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to

INH

IBIT

• Po

sitio

n m

anua

l byp

ass

hand

le (M

BH

)up

war

d

3.

To T

est

ATS

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• M

ove

ATS

loca

tion

hand

le (A

LH)

to T

EST

loca

tion

• Tu

rn D

S to

AU

TO•

Test

sw

itch

(TS)

on

bott

om

cabi

net

door

will

allo

w

elec

tric

al o

pera

tion

of A

TS

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• Ro

tate

cra

nk m

echa

nism

cou

nter

-clo

ckw

ise

until

ATS

TES

T lig

ht is

illu

min

ated

• Tu

rn D

S to

AU

TO•

Test

sw

itch

(TS)

on

bott

om c

abin

et d

oor

will

allo

w e

lect

rical

ope

ratio

n of

ATS

• B

ypas

s pe

r ab

ove

inst

ruct

ions

• Ro

tate

cra

nk m

echa

nism

cou

nter

-clo

ck-

wis

e un

til A

TS T

EST

light

is il

lum

inat

ed•

Turn

DS

to A

uto

• Te

st S

witc

h (T

S) o

n m

icro

proc

esso

rco

ntro

ller

will

allo

w e

lect

rical

op

erat

ion

of A

TS

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• Ro

tate

cra

nk m

echa

nism

cou

nter

-clo

ck-

wis

e un

til A

TS T

EST

light

is il

lum

inat

ed•

Turn

DS

to A

UTO

• Te

st s

witc

h (T

S) o

n bo

ttom

cab

inet

doo

r w

ill a

llow

ele

ctric

al o

pera

tion

of A

TS

4.

To Is

olat

eAT

S

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• M

ove

ATS

loca

tion

hand

le (A

LH)

to IS

OLA

TE p

ositi

on

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• Ro

tate

cra

nk m

echa

nism

cou

nter

-clo

ckw

ise

until

ATS

ISO

LATE

D li

ght

is il

lum

inat

ed

(See

Fig

ure

15)

• B

ypas

s pe

r ab

ove

inst

ruct

ions

• Ro

tate

cra

nk m

echa

nism

cou

nter

-cl

ockw

ise

until

ATS

IS

OLA

TED

ligh

t is

illu

min

ated

• B

ypas

s pe

r in

stru

ctio

n #

2 ab

ove

• Ro

tate

cra

nk m

echa

nism

cou

nter

-cl

ockw

ise

until

ATS

ISO

LATE

D li

ght

is il

lum

inat

ed (S

ee F

igur

e 15

)

5.

To R

emov

eAT

S

• B

ypas

s pe

r in

stru

ctio

n #

2 an

d is

olat

e pe

r #

4 ab

ove

• M

ove

ATS

loca

tion

hand

le (A

LH)

to R

ELEA

SE p

ositi

on•

Dis

conn

ect

mul

tipin

plu

gs•

Lift

ATS

out

of d

raw

er

• By

pass

per

inst

ruct

ion

#2 a

nd is

olat

e pe

r #4

abov

e•

Dis

conn

ect

mul

tipin

plu

gs &

ext

erna

l co

nnec

tions

to

ATS

• Ro

tate

four

(4) p

ower

pan

el la

tche

s to

ver

tical

posi

tion,

slid

e AT

S fo

rwar

d &

lock

mec

hani

sm

in p

lace

• Re

mov

e AT

S fr

om c

abin

et

• B

ypas

s an

d is

olat

e pe

r ab

ove

inst

ruct

ions

• O

pen

Aut

omat

ic T

rans

fer

Switc

hac

cess

pan

el•

Slid

e fo

ur c

orne

r la

tche

s of

ATS

to

inne

rmos

t po

sitio

n•

ATS

can

now

be

rem

oved

from

cab

inet

• B

ypas

s pe

r in

stru

ctio

n #

2 an

d is

olat

epe

r #

4 ab

ove

• D

isco

nnec

t m

ultip

in p

lugs

& e

xter

nal

conn

ectio

ns t

o AT

S•

Slid

e fo

r (4

) cor

ner

latc

hes

of A

TS t

oin

nerm

ost

posi

tion

• Re

mov

e AT

S fr

om c

abin

et

6.

To R

econ

nect

ATS

Afte

r Re

mov

al

• Pl

ace

ATS

into

dra

wer

slo

ts

(fron

t ro

llers

firs

t)•

Turn

Dis

conn

ect S

witc

h (D

S) to

INH

IBIT

• M

anua

lly p

ositi

on A

TS in

to s

ame

sour

ce a

s by

pass

sw

itch

• Re

conn

ect m

ultip

in p

lugs

& e

xter

nal

conn

ectio

ns t

o AT

S•

Push

ATS

inw

ard

to e

ngag

e ca

rria

ge•

Mov

e AT

S lo

catio

n ha

ndle

(ALH

) to

TEST

loca

tion

(as

indi

cate

d by

ligh

t)•

Turn

Dis

conn

ect

Switc

h (D

S) t

o AU

TO &

use

Tes

t Sw

itch

(TS)

to

elec

tric

ally

ope

rate

ATS

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to IN

HIB

IT•

Mov

e AT

S lo

catio

n ha

ndle

(ALH

) to

AUTO

loca

tion

• Tu

rn D

S to

AU

TO &

ope

n by

pass

w

ith M

BH

• AT

S is

now

fully

aut

omat

ic

• Pl

ace

ATS

in s

lide

mec

hani

sm•

Unl

ock

slid

e m

echa

nism

• Sl

ide

ATS

over

pow

er p

anel

latc

hes

&

rota

te la

tche

s to

hor

izon

tal p

ositi

on•

Turn

Dis

conn

ect

Switc

h (D

S) t

o IN

HIB

IT•

Man

ually

pos

ition

ATS

into

sam

e so

urce

as

bypa

ss s

witc

h•

Reco

nnec

t m

ultip

in p

lugs

& e

xter

nal

conn

ectio

ns t

o AT

S•

Rota

te c

rank

mec

hani

sm c

lock

wis

e un

til

ATS

TEST

ligh

t is

illu

min

ated

(See

Fig

ure

15)

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to

AUTO

& u

se

Test

Sw

itch

(TS)

to

elec

tric

ally

ope

rate

ATS

• Tu

rn D

isco

nnec

t Sw

itch

(DS)

to

INH

IBIT

•Ro

tate

cra

nk m

echa

nism

clo

ckw

ise

until

ATS

lo

catio

n po

inte

r is

alig

ned

with

AU

TO m

ark

on lo

catio

nin

dica

tor.

(ATS

mus

t be

in s

ame

sour

ce a

s by

pass

)•

Turn

DS

to A

UTO

& o

pen

bypa

ss w

ith m

anua

lby

pass

han

dle

(MB

H)

• AT

S is

now

fully

aut

omat

ic

• Ro

ll ca

rt b

ack

into

cab

inet

• Sl

ide

four

cor

ner

latc

hes

of

ATS

to o

uter

mos

t po

sitio

n•

Turn

DS

to In

hibi

t•

Man

ually

pos

ition

ATS

into

sa

me

sour

ce a

s B

ypas

s Sw

itch

• C

lose

Aut

omat

ic T

rans

fer

Switc

hac

cess

pan

el•

Rota

te c

rank

mec

hani

sm c

lock

wis

eun

til A

TS T

est

light

is il

lum

inat

ed•

Turn

DS

to A

uto

and

use

TS t

o el

ectr

ical

ly o

pera

te A

TS•

Turn

DS

to In

hibi

t•

Rota

te c

rank

mec

hani

sm c

lock

wis

eun

til A

TS lo

catio

n po

inte

r is

alig

ned

with

Aut

o m

ark

on lo

catio

n in

dica

tor.

(ATS

mus

t be

in s

ame

sour

ce a

s By

pass

)•

Turn

DS

to A

uto

and

open

B

ypas

s w

ith M

BH

• AT

S is

now

fully

aut

omat

ic

• Ro

ll AT

S ca

rt b

ack

into

cab

inet

• Sl

ide

four

(4) c

orne

r la

tche

s of

ATS

to

oute

rmos

t po

sitio

n•

Turn

Dis

conn

ect

Switc

h (D

S) t

o IN

HIB

IT•

Man

ually

pos

ition

ATS

into

sam

e so

urce

as b

ypas

s sw

itch

• Re

conn

ect

mul

tipin

plu

gs &

ext

erna

lco

nnec

tions

to

ATS

• Ro

tate

cra

nk m

echa

nism

clo

ckw

ise

until

ATS

TEST

ligh

t is

illum

inat

ed (S

ee F

igur

e 15

)•

Turn

Dis

conn

ect S

witc

h (D

S) to

AU

TO &

use

Test

Sw

itch

(TS)

to e

lect

rical

ly o

pera

te A

TS•

Turn

Dis

conn

ect

Switc

h (D

S) t

o IN

HIB

IT•

Rota

te c

rank

mec

hani

sm c

lock

wis

e un

tilAT

S lo

catio

n po

inte

r is

alig

ned

with

AU

TOm

ark

on lo

catio

n in

dica

tor.

(ATS

mus

t be

in s

ame

sour

ce a

s by

pass

)•

Turn

DS

to A

UTO

& o

pen

bypa

ss w

ithm

anua

l byp

ass

hand

le (M

BH

)•

ATS

is n

ow fu

lly a

utom

atic

7.

To O

pera

te

the

Bypa

ssSw

itch

Whe

nth

e AT

S is

inTE

ST o

r IS

OLA

TE

• M

ove

the

man

ual b

ypas

s ha

ndle

(MB

H) t

o th

e av

aila

ble

pow

er s

ourc

e

• (1

) Mov

e m

anua

l byp

ass

hand

le (M

BH) d

ownw

ard

to o

pen

the

bypa

ss p

ower

pan

el c

onta

cts,

• (2

) tur

n th

e by

pass

sel

ecto

r sw

itch

(BSS

) to

the

oppo

site

pow

er s

ourc

e, a

nd

• (3

) mov

e th

e M

BH

upw

ard

to c

lose

into

the

sele

cted

pow

er s

ourc

e

• (1

) Mov

e m

anua

l byp

ass

hand

le(M

BH) d

ownw

ard

to o

pen

the

bypa

ss p

ower

pan

el c

onta

cts,

•

(2) t

urn

the

bypa

ss s

elec

tor s

witc

h (B

SS)

to t

he o

ppos

ite p

ower

sou

rce,

and

•

(3) m

ove

the

MBH

upw

ard

to c

lose

in

to th

e se

lect

ed p

ower

sou

rce

• (1

) Mov

e m

anua

l byp

ass

hand

le (M

BH

)do

wnw

ard

to o

pen

the

bypa

ss p

ower

pane

l con

tact

s,

• (2

) tur

n th

e by

pass

sel

ecto

r sw

itch

(BSS

) to

the

opp

osite

pow

er s

ourc

e, a

nd

• (3

) mov

e th

e M

BH

upw

ard

to c

lose

in

to t

he s

elec

ted

pow

er s

ourc

e

Not

es:

• D

isco

nnec

t Sw

itch

(DS)

in IN

HIB

IT p

reve

nts

the

elec

tric

al o

pera

tion

of t

he A

TS.

• D

o no

t us

e ex

cess

ive

forc

e on

mec

hani

cal h

andl

es.

• Fi

gure

s de

pict

byp

ass

oper

atio

ns r

elat

ive

to S

ourc

e 1.

Seq

uenc

es a

re t

he s

ame

for

bypa

ss o

pera

tions

rel

ativ

e to

Sou

rce

2.•

Whe

n AT

S is

in T

EST

or IS

OLA

TE, t

he b

ypas

s sw

itch

oper

ates

as

a m

anua

l tra

nsfe

r sw

itch

to e

ither

ava

ilabl

e so

urce

, whi

ch is

indi

cate

d on

the

ligh

t pa

nel.

(See

Fig

ure

15)

FIG

. 1

BP

IS O

PEN

WIT

H A

TS IN

SO

UR

CE

1

ATS

BN

BE

SOU

RC

E 1

LOA

DSO

UR

CE

2

FIG

. 2

BP IN

SO

URC

E 1

WIT

H A

TS IN

SO

URC

E 1

ATS

BN

BE

SOU

RC

E 1

LOA

DSO

UR

CE

2

FIG

. 3

BP

IN S

OU

RC

E 1

WIT

H A

TS IN

TES

T

(

LOA

D C

ON

NEC

TIO

NS

ARE

OPE

N)

ATS

BN

BE

SOU

RC

E 1

LOA

DSO

UR

CE

2

FIG

. 4

BP

IN S

OU

RCE

1 W

ITH

ATS

ISO

LATE

D

ATS

BN

BE

SOU

RC

E 1

LOA

DSO

UR

CE

2

Figure 16Sequence of Operation for Bypass/Isolation Switches


Symptom Possible Cause(s) Corrective Action

Engine does not start

Engine start wires not terminated properly Check engine start connections

Generator is in OFF position Investigate why Engine Control Switch was turned off

Engine does not stop

U timing cycle not complete Check U timer setting

Engine start wires not terminated properly Check engine start connections

Generator in MANUAL Place generator in AUTO

Source 1 not within proper parametersCheck Source 1 voltage, frequency values, and Source 1 circuit breaker

ATS will not transfer to Source 2

Mechanical or electrical connections problemCheck all connections to SCR modules, check DS for proper operation & wire connections, check limitswitches for proper operation

Remote active inhibit signal Check for remote inhibit signal

Source 2 voltage or frequency not with acceptableparameters

Check engine start connections, generator breaker,generator output & engine control switch

Power supply connector unplugged Plug in connector

W timing cycle not complete Check W timer setting

ATS will not transfer to Source 1

Mechanical or electrical connections problemCheck all connections to SCR modules, check DS for proper operation & wire connections, check limitswitches for proper operation

Remote inhibit active Check for remote inhibit signal

DW timing cycle not complete Check DW timer setting

Source 1 voltage or frequency not within acceptable parameters Check utility & utility breakers

Power supply connector unplugged Plug in connector

T timing cycle not complete Check T timer setting

DANGERHAZARDOUS VOLTAGE CAN CAUSE

SEVERE INJURY OR DEATHTurn OFF all power before installation, adjustment or removal of transfer switch or any of its components.

!

Troubleshooting & Diagnostics

The following troubleshooting guide may be used to recognize and determine basic faults. If you go through all of the suspected faults and still require assistance, call a GE technical representative.

Table 5Basic Troubleshooting Guide for Automatic Transfer Switches


Maintenance and Testing

A preventive maintenance program will insure high relia-bility and long life for the transfer switch. A preventivemaintenance program should including the following:

Inspection and CleaningThe switch should be inspected for any accumulationof dust, dirt or moisture and should be cleaned by vacu-uming or wiping with a dry cloth or soft brush. Do notuse a blower since debris may become lodged in theelectrical and mechanical components of the switchand can potentially cause damage.

Remove the transfer switch barriers and check thecondition of the contacts. Any surface deposits mustbe removed with a clean cloth (do not use emery clothor a file). Pitted or excessively worn contacts should bereplaced. General inspection of the general mechanicalintegrity of the switch should be made to identify andcorrect loose, broken or badly worn parts.

ServicingAll worn or inoperative parts must be replaced usinggenuine GE recommended replacement parts. ContactGE Technical Services for replacement parts information.

The operating mechanism of the transfer switch islubricated with Lubriplate 105. The lubricant applied at the factory will provide adequate lubrication for thelifetime of the switch. Should debris contaminate themechanism, clean and apply additional Lubriplate.

GE can provide complete preventative maintenanceservices. For additional information contact GE TechnicalServices at 1 + 800 637-1738 or 1 + 773 299-6600.

Electrical testing of the switch is discussed in the “Testing”section of this manual. A periodic test of the transferswitch under load conditions is recommended to insureproper operation. (See National Electric Code articles700 and 701)



!

91R-1000 (8/10)

GE Energy – Digital Energy830 W 40th Street, Chicago, IL 60609 USA800 637 1738 www.gepowerquality.com

Information subject to change without notice. Please verify all details with GE. © 2010 General Electric Company All Rights Reserved

Extensive Customer Service and SupportSupported by a worldwide network of factory-trained Authorized ServiceCenters, our Technical Service Representatives can provide you with field service, equipment parts and preventive maintenance.

Because emergency power systems are required to operate under themost adverse circumstances, site personnel may be called upon at anytime to make decisions regarding the operation of the system, thereforetraining of these personnel is critical to the future of any installation.

GE offers a variety of training options including on-site classes for projectpersonnel, factory instruction on your equipment prior to shipment andservice schools covering transfer switches and switchgear systems.

Product OverviewWhen you purchase emergency power equipment, reliability and quality are a necessity. GE is committed to providing the highest level of qualitydemanded by the industry. Our complete product line will allow you to specify a total power management system while maintaining overall compatibility and the most comprehensive warranty in the industry.

Commitment to the CustomerAll team members at GE are aware of the critical situations in which our products are called upon to perform. With that understanding comes an obligation beyond merely fulfilling an order or turning out a product. Serving that obligation is our mission at GE.

GE’s team works with you from the first phone call through completedstart-up. Then, working hand in hand with the consulting engineer, the contractor and the facility owner/operator, we’ll ensure that the system fulfills both current and future needs.

“Commitment to our customer” has been GE’s driving force for more than100 years in the power control industry. This same sense of purpose andresponsibility will continue as we address future power control challenges.

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