Alarms

Alfa Laval Marine & Power

FOPX Separation System

Alarms and Fault Finding

Product No.

PrintedBook No.

1762661-451762764-061762765-061762766-05

1763054-051763056-061763057-061763058-05

Jan 19951810034-02 V1

Alfa Laval reserve the right to make changes at any time without prior notice.

Any comments regarding possible errors and omissions or suggestions for improvement of this publication would be gratefully appreciated.

Copies of this publication can be ordered from your local Alfa Laval company.

Published by: Alfa Laval Separation ABMarine & Power Oil Treatment DivisionS - 147 80 TumbaSweden

© Copyright Alfa Laval Separation AB 1995. Printed in Sweden.

Contents

1 Scope 1

2 EPC Signs 3

3 Alarms 5

3.1 Alarm Fun ctions 5

3.2 Alarm Reset 6

3.3 Alarm Survey 7

3.4 LED Alarms and Fault Finding 8

3.4.1 High Oil Pressure 8

3.4.2 Low Oil Pressure (Low Flow) 9

3.4.3 Sludge Discharge Failure 10

3.4.4 Water Transducer Fault 11

3.4.5 Emergency Stop 12

3.4.6 Vibrations (Option) 13

3.4.7 Heater Fault 14

3.5 LED and Display Alarms and Fault Finding 15

3.5.1 High or Low Oil Tempera-ture (Option) 15

3.5.2 Temperature Sensor Error (Option) 16

3.6 Display Alarms and Fault Finding 17

3.6.1 Communication Error 17

3.6.2 Processor Fault 18

3.6.3 Programming Error 19

3.6.4 Power Failure 20

3.6.5 Temperature Deviation 21

3.6.6 ALCAP Alarms 22

3.6.7 Other Alarms 23

4 Alarm Tests 25

5 Test Program 27

5.1 How to Start the Test Program 27

5.2 Lamp Test 28

5.3 How to Activate Different Parts of the Test Program 28

5.4 Functions in the Test Program 29

1 Scope

The alarms, alarm tests and the test program are valid for the following separation systems:

FOPX 605

FOPX 609

FOPX 610

FOPX 613

1

1 Scope FOPX Alarms and Fault Finding

2

2 EPC Signs

r.

P00

0881

A

functions

P0

0089

1A

ions (Options)

The signs to the control unit for the FOPX separation systems are shown in this chapte

Monitoring

Monitoring funct

3

2 EPC Signs FOPX Alarms and Fault Finding

P00

0991

A

ignals

P0

006

41A

symbols

Output s

Operating

4

3 Alarms

t afe

G0

4420

11

ther by an alarm LED (to the left in the ether with the main alarm LED (to the

3.1 Alarm Functions

The alarm system is designed to ensure thathe separation system always remains in a sstate. There are two different types of alarmfunctions:

• Sensor-related alarm functions are indicated by light emitting diodes (LEDs)on the EPC-400.

• Display-related alarm functions are indicated on the EPC-400 display. Whenany of the displayed alarm functions are activated the left digits start flashing andthe right digits are steadily lit.

If there is more than one alarm at the same time, the EPC-400 will display the alarm withthe highest priority first and then the next alarm, and so on in priority order.

An activated alarm condition is identified eipicture) or an alarm code on the display togright in the picture).

5

3 Alarms FOPX Alarms and Fault Finding

g

.

ill

G00

1645

AG

001

647A

3.2 Alarm Reset1. Acknowledge the alarm signal by pressin

the alarm push-button.The flashing light then changes to steady

2. Remedy the cause.

3. Reset the alarm function by pressing thealarm push-button a second time.The LED will turn off.

It is possible to reset the system without remedying the cause, but the alarm signal wbe repeated.

NOTE

Never return to the EPC-400 control unit to acknowledge or reset an alarm if it by any means can be hazardous.

6

FOPX Alarms and Fault Finding 3 Alarms

Page

8

ow)" 9

" 10

11

12

13

14

ture” 15

r”16

17

18

19

20

21

22

23

3.3 Alarm SurveyLED alarms

Display alarms

Alarm function

"High Oil Pressure"

"Low Oil Pressure (Low Fl

"Sludge Discharge Failure

"Water Transducer Fault"

"Emergency Stop"

“Vibrations” (Option)

"Heater Fault"

“High or Low Oil Tempera(Option)

“Temperature Sensor Erro(Option)

"Communication Error"

"Processor Fault"

"Programming Error"

"Power Failure"

"Temperature Deviation"

"ALCAP Alarms"

“Other Alarms”

7


orrective action

pen or regulate RV4, or other valves, to correct back ressure, normally about 1.5 bar (150 kPa).

omatic actions after alarm reset

ain alarm off.

larm diode off.

1 is set for oil feed to separator.

3.4 LED Alarms and Fault Finding

3.4.1 High Oil Pressure

Cause C

Regulating valve, RV4, or other valves, downstream throttled or closed.

Op

Automatic actions at alarm Aut

Main alarm flashes. M

Alarm diode (PS41) flashes. A

Change over valve (V1) is set for oil recirculation. V

S0

0180

1A

8


orrective actions

heck the oil feed pump.djust the oil flow.

lean the strainer.

heck the oil feed pump.

. Check the air supply to the solenoid valve block air (MV1).

. Check MV1.

. Check V1.

crease the back pressure with regulating valve V4. The correct back pressure is normally about 1.5 ar (150 kPa).

heck the opening water valve (MV15) for leakage.ee “Separator Manual”.

ee “Separator Manual”.


ain alarm off.

larm diode off.


3.4.2 Low Oil Pressure (Low Flow)

Causes C

Too low oil feed. CA

Strainer before the oil feed pump is clogged. C

Oil feed pump has stopped. C

Change over valve (V1) is in recirculation position. 1

2

3

Too low back pressure. InRb

Bowl opened accidentally during operation. CS

Leakage from bowl. S



Alarm diode (PS42) flashes. A

V1 is set for oil recirculation. V

S00

1802

A

9


orrective actions

heck the water supply system.

heck MV15.

heck PS42.

. Check the separator by manually open MV15.

. Dismantle and check the operating water system. See “Separator Manual”.

harge, within the same discharge cycle, have failed.


ain alarm off.

larm diode off.

. If the power has been off during more than approximately 10 minutes the separator bowl must be stopped and manually cleaned before restart.

. The separator and the EPC program has to be restarted.

3.4.3 Sludge Discharge Failure

Causes C

No or very low opening water supply. C

Opening water valve (MV15) broken. C

No signal from low oil pressure switch (PS42) at dis-charge.

C

Separator operating water system not working. 1

2

N.B. This alarm is activated after two attempts to disc



Alarm diode flashes. A

The stop sequence is initiated. 1

2

I00

0682

A

10


orrective actions

heck connections.

heck supply voltage in the MT4 on terminal 3 - 4 (20 DC). bout every 5:th second the voltage at terminal 4 - 5 0 VDC) will drop for approx. 0.5 second:

If voltage drop: replace the oscillator unit.

If no voltage drop: replace the EPC control module.

or more information about the interconnections, see ystem Reference”.


ain alarm off.

larm diode off.


3.4.4 Water Transducer Fault

Causes C

Loose connection between transducer test circuit board and oscillator.

C

Faulty oscillator unit or faulty EPC control module. CVA(2

•

•

F“S





S00

0261

A

11


orrective actions

. Remedy the cause why the emergency stop button was pushed and then reset it.

omatic action after alarm reset

he alarm function can not be reset by pushing the larm reset button.

. Reset the alarm by switching the power off and on.

. Restart the separator.

. Restart the EPC program.

3.4.5 Emergency Stop

Cause C

Emergency stop button has been pushed. 1


Main alarm flashes.Alarm diode flashes.The separator is stopped and the heater is off.Oil feed is on for further 3 minutes through the heater and separator.Bowl closing water supplied for 3 minutes.

Ta

1

2

3

NOTE

The separator bowl must be manually cleaned before starting up again.

S00

3911

A

12


orrective actions

emedy the cause. See “Separator Manual”.heck the vibration switch setting.

omatic action after alarm reset

he alarm function can not be reset by pushing the larm reset button.

. Reset the alarm by switching the power off and on.

. Restart the separator.

. Restart the EPC program.

3.4.6 Vibrations (Option)

Cause C

Vibration switch activated.Separator bowl out of balance.

RC


Main alarm flashes.Alarm diode flashes.Separator is stopped.Oil feed is on for a further 3 minutes through the heat-er and separator.Bowl closing water supplied for 3 minutes.

Ta

1

2

3

NOTE

The separator bowl must be manually cleaned before starting up again.

S00

0111

A

13


trolled by the EPC-400.

orrective action

oil flow stopped, investigate the cause. See correc-ve actions for PS42.heck the flow switch on the Heatpac heater. temperature switch tripped, investigate the temper-ture switch setting. If OK check the heater for clean-ness.

lean heater.


ain alarm off.

larm diode off.


eater switched on.

3.4.7 Heater Fault

N.B. Heater fault is only activated if the heater is con

Cause C

Oil flow stopped or temperature switch tripped in an installed Heatpac heater.

IftiCIfali

Clogged heater. C





Heater switched off. H

I00

0221

A

14


ted.

orrective actions

vestigate the reason and remedy it.

vestigate the reason and remedy it.

. Adjust the parameters.P5 = max. tempP6 = min. tempP7 = set point.See “Parameter List”.

. Check the temperature control loop.

. Check and adjust the SRV1 function.

. Check the EPC output functions.

heck the heater and parameter P41, See “Parame-r List”.

heck the Pt 100 temperature sensor.

larm is acknowledged. To find the appropriate et button twice 1C (1F) = TT1, 2C (2F) = TT2. For


ain alarm off.

larm diode off and display returned to normal.


eater is switched on (if heater is controlled by EPC-00).

3.5 LED and Display Alarms and Fault Finding

3.5.1 High or Low Oil Temperature (Option)

N.B. Also applicable to TT2 temperature sensor, if fit

Causes C

Low temperature alarm when:- clogged heater- insufficient steam supply- faulty steam trap- faulty steam supply valve- electric fault (tripped fuse)

In

High temperature alarm when:- faulty steam supply valve- electrical control system out of function

In

Set point (P7) changed or the alarm limits are too close to the set point.

1

2

Steam control valve (SRV1) too far open or closed. 1

2

Low temperature alarm when the temperature in-creases too slowly, during the start.

Cte

Pt 100 temperature signal faulty. C

N.B. The current temperature is indicated when the atemperature sensor reading, push the alarm resmore information, see “Operating Instructions”.



Alarm diode and displayed value flashes. A


Heater is switched off at high temperature (if heater is controlled by EPC-400).

H4

S0

001

21A

S00

014

1A

15


ted.

orrective actions

heck the temperature sensor by the test program, ee ‘‘Analog inputs’’ on page 32 in the chapter "Test rogram".

heck the connections.

heck the cables between the temperature sensor nd EPC-400.

process value reading.re sensors are fitted, alarm A6 is also activated.


ain alarm off.

larm diode off and display returned to normal.


3.5.2 Temperature Sensor Error (Option)

N.B. Also applicable to TT2 temperature sensor, if fit

Causes C

Temperature sensor is incorrectly connected. CsP

Temperature sensor loop is open or short-circuit. C

Temperature sensor cables are too close to power ca-bles.

Ca

N.B. Push the alarm reset button to find appropriate 1C (1F) = TT1, 2C (2F) = TT2. If both temperatu



Alarm diode and displayed value flashes. A


S00

012

1A

S00

013

1A

16


Corrective actions

ror between front rd.

1. Check by measurement the fuses A1:F2 (front board), A2:F2 and A2:F3 (rear board).(See “Component Description, EPC-400 Control Unit”).

2. Replace the control module.

t alarm Automatic actions after alarmreset

. Main alarm off.Display normal.

3.6 Display Alarms and Fault Finding

3.6.1 Communication Error

Alarm code Cause

Communication erand rear circuit boa

Automatic action a

Main alarm flashesDisplay flashes.

S0

0015

1AI0

011

05A

17


Corrective actions

. Replace control module.

r. Replace control module.

Replace control module.

Replace control module.

Check that the mode selector is in the correct position.

ital) conversion Check the fuse A1:F2 (front board)If the fuse is correct, replace the control module.

Ask for service or replace the con-trol module.

at alarm Automatic actions after alarmreset


3.6.2 Processor Fault

Alarm codes Causes

Internal RAM error

External RAM erro

E2 RAM error.

Program error.

Mode switch error.

A / D (Analog / Digerror.

Calibration error.

Automatic actions


S00

0161

AI0

010

91A

I00

110

6A

I001

092

AI0

010

93A

I001

096A

I001

094

AI0

0109

5A

18


Corrective action

e too long utes without g this time).

Change the mode selector to the “L” (Local) position and when appropriate, return to the “P” (Programming) position and continue with programming.

at alarm Automatic actions after alarm reset


3.6.3 Programming Error

Alarm code Cause

Programming mod(more than 30 minprogramming durin

Automatic actions


S00

0171

AI0

011

08A

19


tinuous during the alarm delay time before an alarm is

Corrective actions

1. Check the power supply.

2. If the power has been off during more than approximately 10 minutes the separator bowl must be stopped and manually cleaned before restart.

3. Restart the heater, separator and EPC program.

ency too high 1. Check the power supply.

2. If the power has been off during more than approximately 10 minutes the separator bowl must be stopped and manually cleaned before restart.

3. Restart the heater, separator and EPC program.


A4-1:nd display start r returns.

Only valid for alarm A4-1:Main alarm off.Display indicates “OFF”.

A4-2:.

Only valid for alarm A4-2:Main alarm off.Display normal.

3.6.4 Power Failure

1. The frequency deviation must be repeated or be conactivated.

Alarm codes Causes

Power failure.

Power supply frequ

(more than + 5%).1

Automatic actions

All outputs are off.

Only valid for alarmMain alarm diode ato flash when powe

Only valid for alarmMain alarm flashesDisplay flashes.

S00

0181

AI0

011

03A

I00

110

4A

20


Corrective actions

tion alarm n TT1 and TT2/54 °F).

At commissioningCheck if the distance between sen-sors is too great.System in operationCheck the temperature sensors.



ate process value reading 1C (1F) = TT1, rating Instructions”.

3.6.5 Temperature Deviation

Alarm code Cause

Temperature devia(difference betweeis more than 30 °C

Automatic actions


N.B. Push the alarm reset button to find the appropri2C (2F) = TT2. For more information, see “Ope

S00

0191

AI0

011

09A

21


Corrective actions

cer (MT4)

ntent in oil. Check the oil system for water leak-age.

cer dirty inside. Clean the liquid-wetted surfaces of water transducer. See “Component Description, Water Transducer”.

cer (MT4)

the MT4. 1. Check connections in control unit and transducer.

2. Check cables for damage.

n between and electrode.

1. Check the cable connection.

2. Tighten oscillator unit to the electrode.

ore than 24 The reason for stand-by mode must be checked!Try then to operate the system nor-mally.

fault. Replace control module.

ter transducer e discharges in a

1. Check the displacement water supply, including parts in separator.

2. Check for bowl leakage.

at alarm Automatic actions after alarm reset


3.6.6 ALCAP Alarms

Alarm codes Causes

High water transduvalue (above 400):

• High water co

• Water transdu

Low water transduvalue (below 100):

• Open circuit in

• Bad connectiooscillator unit

ALCAP stand-by mhours.

PROM and/or RAM

No triggering by wasignal at two sludgrow.

Automatic actions


S00

0211

A

I00

1111

AI0

0111

2A

I001

113

AI0

011

15A

I001

181

A

22


Corrective actions

1. Check the connected external function.

2. Check the jumper at terminal XC-X7:1 (when extra alarm not used).

l (PS42) faulty at be open.

Check the pressure switch.

at alarm Automatic actions after alarm re-set


er sequences is lid for alarm

3.6.7 Other Alarms

Alarm codes Causes

Extra alarm.

Low pressure signastart. Circuit should

Automatic actions


The start of the timblocked (is only vaA9-2).

S00

0201

A

I00

112

1AI0

011

22A

23


24

4 Alarm Tests

o

Sensor Actions to provoke an alarm

PS41 Increase back pressure.

PS42 A. Stop oil feed pump.

B. Change V1 position by reducing air pressure.

C. Reduce the back pressure.

re PS42 1. Disconnect hose for opening water (MV15).

2. Initiate a sludge discharge.

MT4 Disconnect cable to XE:4 (the test signal to MT4).

XS2 Press the emergency stop button.

XS1 Tap on the vibration switch three times within one second.

- 1. Start the heater.

2. Disconnect cable to X9:3.

Use the following guide for testing alarm functions by activating them. Alarms are provoked by one or more actions (A, B and son) as shown in the right column, however, certain alarm functions can not be tested without being disconnected.

N.B. If the alarm functions are to be disconnected in the control unit, be careful to avoid a short-circuit.

The recommendation is to test the alarms every 3 months.

LED alarm Display alarm Function

High oil pressure

Low oil pressure (low flow)

Sludge discharge failu

Water transducer fault

Emergency stop

Vibrations (option)

Heater fault

25

4 Alarm Tests FOPX Alarms and Fault Finding

- TT1 A. Remove sensor from pipe and put into hot/cool liquid.

B. Change alarm limit parameters (P5 = max temp., P6 = min. temp.) in relation to actual temperature. For more information see “Parameter List”.

N.B. Reset the parameter values after test.

- Remove fuse A2:F3 (rear board).

- Remove fuse A1:F2 (front board).

- Leave the mode selector switch in position P for 30 minutes.

- Switch the power to the EPC off and on when it is in operation.

TT1 - TT2 Remove one sensor from pipe to cool off or be heated up (temp. diff. more than 30 °C/54 °F).

MT4 Touch the central screw in the MT4 connection box.

MT4 Disconnect cable to XE:3 in EPC.

MT4 A. Change parameter 70 to a low value (e.g. 5 seconds) and initiate discharge cycle twice.

B. Close displacement water supply and wait 2 discharge cycles.

The amount of displacement water

supply is checked every 2nd dis-charge.

- A. Activate appropriate sensor.

B. Disconnect cable X7:1.

)PS42 With the EPC in off mode put a jump-

er between XC- X7:4 and push the start button.

Sensor Actions to provoke an alarm

High or low oil temperature (option)

Communication error

A / D conversion error

Programming error

Power failure

Temperature deviation

High water transducer (MT4) value (above 400).

Low water transducer (MT4) value (below 100).

Insufficient amount of displacement water

Extra alarm

PS42 faulty at start(Circuit should be open

LED alarm Display alarm Function

26

5 Test Program

,

the

d.

P0

001

91A

The EPC-400 control unit has a test programfor testing of input and output functions, memory etc.

This test program should be run when the installation is made and whenever there is aneed for it, for instance, during fault finding.

5.1 How to Start the Test Program

N.B. The test program is only to be used when the separation system is out of operation.

To run the test program, do as follows:

1. Open the control unit door.

2. Switch the power off and the mode selector in any position (R, L or P).

3. Press simultaneously the discharge and alarm push-buttons, and keep them pressed.

4. Switch the power on.

5. Release the discharge and alarm push-buttons when the test program has starte

27

5 Test Program FOPX Alarms and Fault Finding

ts 3

FOPX

V5

MV10V1

MV16

MV15

EPC-400

TT2

TT1

XS1

MT4 FS4

FOPX

XT1

G00

114

2AP

00

0181

A

5.2 Lamp Test

The test program starts with a lamp test.

1. The display lit with power on.

2. There are two ways to check the lamps:

• Each LED and display segment individually lit (see the picture).

• Each group of LED:s and display segments lit.

Push the button 2 (see the figures in the picture below) to switch between the twomodes.

5.3 How to Activate Different Parts of the Test Program

Use the push-buttons to activate different parof the test program (see the figures 1, 2 andin the picture).

1. Push button 1 to step from function 1 to function 2 etc. in the test program. It is not possible to step backwards.Wait until the function is activated beforepushing the button again.

2. Push button 2 to step forward within each function in the test program, for instancefrom function 1.1 to 1.2.

3. Push button 3 to activate or deactivate output terminal (function 5 and 6).

28

FOPX Alarms and Fault Finding 5 Test Program

Terminal Unit Correct value

X7:4-XC PS42 0

X7:3-XC PS41 1

ibration X8:4-XC XS2 or XS1

1

- -

X8:2-XC Remote switch

0


0

5.4 Functions in the Test Program

1. Memory

2. Digital inputs

Function

1.1 PROM

1.2 Internal RAM

1.3 External RAM

1.4 EEPROM

Function

2.1 Low flow

2.2 High pressure

2.3 Not in use

2.4 Not in use

2.5 Emergency stop or Vswitch

2.6 Not in use

2.7 Start or stop EPC

2.8 Start or stop heater

I000

941A

Memory correct

I00

095

1A

Memory fault

I000

941

A

Circuit open

I000

961A

Circuit closed

29


Terminal Unit Correct value

r Reset X9:4-XC Remote switch

0

X9:3-XC 1


0

3. Digital inputs

4. Mode selector

Function

3.1 Alarm acknowledge o

3.2 Heater fault

3.3 Sludge discharge

Function

4.1 Remote (R) position

4.2 Local (L) position

4.3 Program (P) position

I00

0941

A

Circuit open

I000

961

A

Circuit closed

I000

971

A

Remote position

I000

981A

Local position

I00

0991

A

Program position

30


Terminal Unit

X4:4-XD MV1/V1

X5:1-XD MV5

ing water X5:2-XD MV10

X5:3-XD MV15

X5:4-XD MV16

or Heatpac X6:1-XD -

e or Heatpac X6:2-XD -

or Heatpac X6:3-XD

Terminal Unit

X6:4-XD

ng during X4:2-XD K15 in power unit

X1:1-2

rm X2:1-2

itch X2:3-4 XS1

5. Digital outputs

Use push-button 3 to activate or deactivate each output (see ‘‘How to Activate Different Parts of the Test Program’’ on page 28).

N.B. Corresponding green LED is not lit.

6. Digital outputs

Use button 3 to activate or deactivate each output. (See ‘‘How to Activate Different Partsof the Test Program’’ on page 28.)

N.B. Corresponding green LED is not lit.

7. Not in use

Function

5.1 Oil feed

5.2 Water drain

5.3 Displacement or sealsupply

5.4 Opening water

5.5 Closing water

5.6 Steam shut-off valve fixed load

5.7 Steam valve decreasfixed load

5.8 Steam valve increasefixed load

Function

6.1 Heatpac variable load

6.2 Heatpac alarm blockistart

6.3 Not in use

6.4 Separator stop

6.5 Not in use

6.6 Remote/common ala

6.7 Blocking vibration sw

I000

941A

Circuit deactive

I00

0961

A

Circuit active

I000

941

A

Circuit deactive

I00

096

1A

Circuit active

31


s d.

or

Causes to the alarm “Temperature sensor error” (the display shows the alarm code “EEE”)

se A1:F2 blown

A/D conver-sion faulty

Input open Input short circuit

000 000 255 000

000 000 255 000

000 000 195 – 215 195 – 215

P0

001

11A

8. Analog inputs

To simulate the temperature sensor element(Pt 100) in 8.1 and 8.2, a resistor can be useSeparate plug connectors with appropriate resistors are included in the test module kit.

The normal value on the display for function8.1 and 8.2 should be 60 – 215. Outside therange 42 – 233 indicates a fault. Value 000 (a very low value) or 255 indicates a serious fault.

A normal value for function 8.3, Reference 4 V should be 195 – 215.

The table below shows how to find the fault.

For instance, if the display shows “000” for function 8.1, 8.2 and 8.3, it must be either a blown fuse or A/D converter fault. Check it inthis order:

1. If the fuse is blown, replace it.

2. If the fuse is correct, replace the control module.

Resistor Ref.temp Display reading

110 Ω 25 °C/77 °F 60140 Ω 104 °C/219 °F 215

Function Terminal Unit Fu

8.1 Temperature sensor for control

X10:1-2-3 TT2

8.2 Temperature sensor for alarm

X11:1-2-3 TT1

8.3 Reference 4 V

8.4 Not in use

32


Terminal Unit

an E).X14:1-3

DC rrect).

X14:1-3

P00

012

1A

9. Serial communication

N.B. Disconnect the communication cable and put a jumper between X14:3-4 before the test is carried out.

N.B. After the test, remove the terminal jumpers and connect communication cables.

Function

9.1 Not applicable(The display will show

9.2 RS 232 CMeasure -10 to -12V on X14:1-3 (Circuit co

I000

941A

Circuit correctI0

0095

1A

Circuit fault

33


n

I00

0941

A

Circuit correct

I00

095

1A

Circuit fault

10.Test of EPROM (rear circuit board)

11. Test of internal RAM in CPU (rear circuit board

12.Test of external RAM in CPU (rear circuit board)

13.Test of IC 8255 I/O port (rear circuit board)

14.Low reference analog input (internal)

A value between 42 and 66 is displayed, wheit is correct.

15.High reference analog input (internal)

A value between 220 and 310 is displayed, when it is correct.

16.Transducer signal (internal)

The display shows 100 ± ∼50 with oil in WT 200 and 55 ± 10 with air, when it is correct.

17.Not in use

18.Not in use

34

Alarms

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