Alarms and Fasult Finding

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Gontents

25

27

27

28

4

5

5.1

5.2

5.3

1

3

5

5

6

7

1

2

3

Scope

EPC Signs

Alarms

Alarm Functions

Alarm Reset

Alarm SurveY

LED Alarms and FaultFinding3.4.1 High Oil Pressure

3.4.2 Low Oil Pressure(Low Flow)

3.4.3 Sludge Discharge Failure

9.4.4 WaterTransducer Fault

3.4.5 EmergencY StoP

3.4.6 Vibrations(OPtion)

3.4.7 Heater Faull

LED and DisPlaY Alarms andFault Finding

3.5.1 High or Low Oil TemPerature (OPtion)

3.5.2 TemPerature Sensor Error(Option)

Display Alarms and FaultFinding3.6.1 CommunicationError

3.6.2 Processor Fault

3.6.3 ProgrammingError

3.6.4 Power Failure

3.6.5 TemPerature Deviation

3.6.6 ALCAP Alarms

3.6.7 Other Alarms

Alarm Tests

Test Program

How to Start the TestProgram

Lamp Test

How to Activate DifferentParts of the Test Program

Functions in the TestProgram

3.1

3.2

3.3

3.4

3.5

5.4

o

8

I

I

10

1 1

1 2

1 3

14

1 5

1 5

1 6

1 7

17

18

1 9

20

21

22

23

3.6

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2 EPC Signs

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The signs to the control unit for the FOPXseparation systems are shown in this chapter.

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Monitoring functions (Oqtions)

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Monitoring functions

2 EPC Signs FOPX Alarms and Fault Finding

rOPX E P C _ 4 O O

Output signals

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AOperating symbols

3 Alarms

1'

3.1 Alarm Functions

Tite aiarm system is designed to ensure thatdr separaion system always remains in a safesane, TberE are two different types of alarm:;mrions:

Sasor-related alarm functions areirxricared by light emitting diodes (LEDs)on *re EPC-400.

Displa.r--related alarm functions areirraicaed on the EPC-4OO display. Whenany oi the displayed alarm functions areactivated the left digits start flashing andtre right digits are steadily lit.

F Serc is more than one alarm at the same:=e- 6e EPC-4O0 will display the alarm with3e hig[est priority first and then the next3.*m- and so on in priority order.

An activated alarm condition is i&ntified either by an alarm LED (to the left in thepicture) or an alarm u& on the disflay together with the main alarm LED (to theright in the picture).

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3 Alarms FOPX Alarms and Fautt Findrg

3.2 Alarm Reset1. Acknowledge the alarm signal by pressing

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.

)t is possib) e to reset tbe system witltoutremedying the cause, but the alarm signal willbe repeated.

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oNOTE

llnsrom m the EPC-4OO controlffie or reset an alarmIilfqru rrn ls hazardous.

FOPX Alarms and Fault Finding 3 Alarms I3.3LEDalarms

Alarm SurueyDisplayalarms

Page

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Alarm function

"High Oil Pressure"

"Low Oil Pressure (Low Flow)"

"Sludge Discharge Failure"

"Water Transducer Fault"

"Emergency Stop"

"Vibrationd' (Option)

"Heater Fault"

"High or Low OilTemperature"(Option)

"Temperature Sensor Erro/'(Option)

"Communication Error"

"Processor Fault"

"Programming Error"

"Power Failure"

"Temperature Deviation"

"ALCAP Alarms"

"Other Alarms"

1 0

1 1

12

1 3

1 4

1 5

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1 6

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1 7

1 8

1 9

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3 Alarms FOPX Alarms and Fault Finding

3.4 LED Alarms and FaultFinding

3.4.1 High Oil Pressure

@ H

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Cause Corrective action

Regulating valve, RV4, or other valves, downstreamthrottled or closed.

Open or regulate RV4, or other valves, to correct backpressure, normally about 1.5 bar (150 kPa).

Automatic actions at alarm Automatic actions after alarm reset

Main alarm flashes. Main alarm off.

Alarm diode (PS41) flashes. Alarm diode off.

Change over valve (V1) is set for oil recirculation. V1 is set for oil feed to separator.

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FOPX Alarms and Fault Finding 3 Alarms

3.4.2 Low Oil Pressure (Low Flow)

@HCauses Corrective actions

Too low oilfeed. Gheck the oilfeed pump.Adjust the oil flow.

Strainer before the oilfeed pump is clogged. Clean the strainer.

Oilfeed pump has stoppecl. Check the oilfeed pump.

Change over valve (V1) is in recirculation position. 1. Check the air supply to the solenoid valve blockai r (MV1).

2. Check MV1.

3. Check V1.

Too low back pressure. Increase the back pressure with regulating valveRV4. The correct back pressure is normally about 1.5bar (150 kPa).

Bowl opened accidentally during operation. Check the opening water valve (MV15) for leakage.See "Separator Manual".

Leakage from bowl. See "Separator Manual".


Main alarm flashes. Main alarm otf,

Alarm diode (PS42) flashes. Alarm diode otf.

V1 is set for oil recirculation. V1 is set for oil feed to separator.

I

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3.4.3 Sludge Discharge Failure

b*ECauses Corrective actions

No or very low opgning water supply. Check the water supply system.

Opening water valve (MV15) broken. Check MV15.

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

Check PS42.

Separator operating water system not working. 1. Check the separator by manually open MV15.

2. Dismantle and check the operating watersystem. See "Separator Manual".

N.B. This alarm is activated after two attempts to discharge, within the same discharge cycle, have failed.


Main alarm flashes._ r $ r

Main alarm off.

Alarm dio@sho0. Alarm diode off.

The stop sequence is initiated. 1. lf the power has been off during more thanapproximately 10 minutes the separator bowlmust be stopped and manually cleaned beforerestart.

2. The separator and the EPC program has to berestarted.

I

1 0


3.4.4 Water Transducer Fault

@ gCauses Corrective actions

Loose @nnection between transducer test circuitboard and oscillator.

Check connections.

Faulty oscillator unit or faulty EPC control module. Check supply voltage in the MT4 on terminal 3- 4 (20v Dc).About every S:th second the voltage at terminal 4 - 5(20 VDC) will drop for approx. 0.5 second:

o lf voltage drop: replace the oscillator unit.

. lf no voltage drop: replace the EPC controlmodule.

For more information aboutthe interconnections, see"System Reference".



Alarm diode flashes. Alarm diode off. .s .



3.4.5 Emergency Stop

@ eGause Corrective actions

Emergency stop button has been pushed. 1. Remedy the cause why the emergency stopbutton was pushed and then reset it.

NOTE

The separator bowl must be manuallycleaned before starting up again.

Automatic actions at alarm Automatic action after alarm reset

Main alarm flashes.Alarm diode flashes.The separator is stopped and the heater is otf.Oilfeed is on forfurther 3 minutes through the heaterand separator.Bowl closing water supplied for 3 minutes.

The alarm function can not be reset by pushing thealarm reset button.

1. Reset the alarm by switching the power off andon.

2. Restart the separator.

3. Restart the EPC program.

1 2


3.4.6 Vibrations (OPtion)

@ ;

NOTE

The separator bowl must be manuallycleaned before starting up again.

Cause Corrective actions

Vibration switch activated.Separator bowl out of balance.

Remedy the cause. See "Separator Manual .Check the vibration switch setting.

Automatic actions at alann Automatic action after alarm reset

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

The alarm function can not be reset by pushing thealarm reset button.

1. Reset the alarm by switching the power off andon.

2. Restart the seParator.

3. Restart the EPC program.


3.4.7 Heater Fault

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N.B. Heater fault is only activated if the heater is controlled by the EPC-400.

Cause Corrective action

Oil flow stopped or temperature switch tripped in aninstalled Heatpac heater.

lf oil flow stopped, investigate the cause. See correc-tive actions for PS42.Check the flow switch on the Heatpac heater.lf temperature switch tripped, investigate the temper-ature switch setting. lf OK check the heater for clean-liness.

Clogged heater. Clean heater.



Rtarrtrt|ode flashes. Alarm diode off.

Change:ov$ valve (V1) is set for oil recirculation. V1 is set for oil feed to separator.

Heater switched off. Heater switched on.

1 4


3.5 LED and DisplayAlarms and FaultFinding

3.5.1 High or Low Oil Temperature(Option)

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- \, N.B. Also applicable to TT2 temperature sensor, if fitted.

Gauses Corrective actions

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

Investigate the reason and remedy it.

'High temperature alarm when:

- faulty steam supply valve- electrical control system out of function

lnvestigate the reason and remedy it.fr

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

1. Adjust the parameters.P5 = rnax. tempP6 = min. t€mpP7 = set point.See "Parameter List'.

2. Check the temperature control loop.

Steam controlvalve (SRVI) too far open or closed. 1. Check and adjust the SRVI function.

2. Gheck the EPC output functions.

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

Check the heater and parameter P41, See "Parame-

ter List'.

Pt 100 temperature signalfaulty. Check the Pt 100 temperature sensor. 1

N.B. The current temperature is indicated when the alarm is acknowledged. To find the appropriatetemperature sensor reading, push the alarm reset button twice 1C (1 F) = TT1 ,2C (2F) = TT2. Forrnore information, see "Operatin g I nstructions'.



Alarm diode and displayed value flashes. Alarm diode off and display returned to normal.


Heater is switched ofi at high temperature (if heater iscontrolled by EPC-400).

Heater is switched on (if heater is controlled by EPC-400).

1 5


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3.5.2 Temperature Sensor Error(Option)

@ *N.B. Also applicable to TT2 temperature sensor, if fitted.

Gauses Corrective actions

Temperature sensor is incorrectly connected. Check the temperature sensor by the test program,see "Analog inputs" on page 32 in the chapter "Test

Program".

Temperature sensor loop is open or short+ircuit. Check the connections.

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

Check the cables between the temperature sensorand EPC-400.

N.B. Push the alarm reset button to find appropriate process value reading.1C (1F) = TT1, 2C (2Fl =TT2.lf both temperature sensors are fitted, alarm A6 is also activated.


Main alarm flashes. Main alarm otf.

Alarm diode and displayed value flashes. Alarm diode off and display returned to normal.


1 6


3.6 Display Alarms andFault Finding

3.6.1 Communication Error

W-HAlarm code Cause Corrective actions

Communication error between frontand rear circuit board.

1 . Check by measurement thefuses A1:F2 (front board),A2:F2 and M:F3 (rear board).(See "Component DescriPtion,EPC-400 Control Unit').

Replace the contol module.2.

Automatic action at alarm Automatic actions after alarmreset

Main alarm flashes.Display flashes.

Main alarm off.Display normal.


3.6.2 Processor Fault

E HAlarm codes Causes Corrective actions

sI6

Internal RAM error. Replace control module.

pa5

External RAM error. Replace control module.

BE2 RAM error. Replace control module.

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Program error. Replace control module.

E:6

Mode switch error. Check that the mode selector is inthe correct position.

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EA / D (Analog / Digital) conversionerror.

Check the fuse A1:F2 (front board)lf the fuse is correct, replace thecontrolmodule.

dCalibration error. Ask for service or replace the con-

trolmodule.

Automatic actions at alarm Automatic actions after alarmreset



1 8


3.6.3 Programming Error

E-;Alarm code Cause Corrective action

Programming mode too long(more than 30 minutes withoutprogramming during this time).

Change the mode selector to the"L" (Local) position and whenappropriate, return to the"P" (Programming) Position andcontinue with programming.




1 9


Alarm codes Causes Corrective actions

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Power failure. 1. Check the power supply.

2. lf the power has been ofiduring more thanapproximately 10 minutes theseparator bowl must bestopped and manually cleanedbefore restart.

3. Restart the heater, separatorand EPC program.

Power supply frequency too high(more than + 5%).1

1. Check the power supply.

2. lf the power has been offduring more thanapproximately 10 minutes theseparator bowl must bestopped and manually cleanedbefore restart.

3. Restart the heater, separatorand EPC program.

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3.6.4 Power Failure

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All outputs are off.

Only valid for alarm A4-1:Main alarm diode and display starlto flash when power returns.

Only valid for alarm Azl-1:Main alarm otf.Display indicates "OFF'.

Only valid tor alarm A42:Main alarm flashes.Display flashes. '

Onfy valid tor alarm A*2:Main alarm off.Display normal.

1. The frequency deviation must be repeated or be continuous during the alarm delay time before an alarm isactivated.

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20


3.6.5 Temperature Deviation

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Autbmatic actions at alarm Automatic actions after alarmreset



N.B. Push the alarm reset button to find the appropriate process value reading 1C (1F) = TT1,2C (2F) =TT2. For more information, see "Operating Insfuctions".

Alarm code Cause Corrective actions

I=6

Temperature deviation alarm(difference between TT1 and TT2is more than 30 'C/54 "F).

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


3.6.6 ALCAP Alarms

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Alarm codes Causes Corrective actions

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

. High water content in oil. Check the oil system for water leak-age.

o Water transducer dirty inside. Clean the liquid-wetted surfaces ofwater transducer. See "ComponentDescription, Water Transduce/'.

at

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

. Open circuit in the MT4. 1. Check connections in controlunit and transducer.

2. Check cables for damage.

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. Bad connection betweenoscillator unit and electrode.

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1. Check the cable connection.

2. Tighten oscillator unit to theelectrode.

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ALCAP stanGby more than 24hours.

Thbleason for stand-by mode mustbe checked!Try then to operate the system nor-mally.

5

PROM and/or RAM fault. Replace contdi module.

6

No friggering by water tansducersignal at two sludge discharges in arow.

1. Check the displacement watersupply, including parts inseparator.

2. Check for bnwl leakage.

Automatic actions at alarm Automatic acticns after alarmreset



22

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FOPX Alarms and Fault Finding

3.6.7 Other Alarms

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Alarm codes Causes Corrective actionsn."&.,:

Extra alarm. 1. Check the connd$ed extemalfunction. -,. ; ' l

e$lQ$eck the Jumper at terminal{JKC-X7:1 (when extra alarm not

used).

Low pressure signal (PS42) faulty atstart. Circuit should be open.

Check the pressure switch.',"t:df:

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Automatic actions at alarm


Main alarm otf.Display normal. :;,rj,

The start of the timer sequences isblocked (is only valid for alarmA9-2). . I

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4 Alarm Tests

f

Use the following guide for testing alarmfunctions by activating them. Alarms areprovoked by one or more actions (A, B and soon) as shown in the right columno however,certain alarm functions can not be testedwithout being disconnected.

N.B. If the alarm functions are to bedisconnected in the control unit, becareful to avoid a short-circuit.

The recommendation is to test the alarms

L-

every 3 months. '+ffiLED alarm Display alarm Function Sensor Actions to provoke an alarni l:*

@High oil pressure PS41 Increase back pressure.

@Low oil pressure (lowflow)

PS42 A. Stop oilfeed pump.

B. Change V1 position bY reducingair pressure

C. Reduce the back pressurd.-'-'

) rSludge discharge failure PS42 1. Disconnect hose for oPening

water (MV15).

2. Initiate a sludge discharge.

@Water transducer fault MT4 Disconnect cable to XE:4 (the test

signalto MT4).

@Emergency stop X52 Press the emergency stotibuttoh.

@Vibrations (option) XS1 Tap on the vibration switch three

times within one second.

NHeater fault 1. Start the heater.

2. Disconnect cable to X9:3.

4 Alarm Tests FOPX Alarms and Fault Finding

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LED alarm Display alarm Function Sensor Actions to provoke an alarm

@High or low oiltempera-ture (option)

TT1 A. Remove sensor from pipe andput into hoVcool liquid.

B. Change alarm limit parameters(P5 = m?x temp., P6 = min.temp.) in relation to actualtemperature. For moreinformation see "Parameter

List'.

N.B. Reset the parameter valuesafter test.

Communication error Remove fuse 42:F3 (rear board).

A/Dconvers ionerror Remove fuse A1:F2 (front board).

Programming error Leave the mode selector switch inposition P for 30 minutes.

Power failure Switch the power to the EPC off andon when it is in operation.

Temperature deviation TT1 . TT2 Remove one sensor from pipe to cooloff or be heated up (temp. diff. morethan 30'C/54'F).

High water transducer(MT4) value (above400).

MT4 Touch the central screw in the MT4cpnnection box.

Low water transducer(MT4) value (below100) .

MT4 Disconnect cable to XE:3 in EPC.

Insufficient amount ofdisplacement water

MT4 A. Ghange parameter 70 to a lowvalue (e.9.5 seconds) andinitiate discharge cycle twice.

:, ' .B. Close displacement water

supply and wait 2 dischargecycles.

The amount of displacement watersupply is checked every 2nd dis-charge.

Extra alarm A. Activate appropriate sensor.

B. Disconnect cable X7:1.

PS42 faulty at start(Circuit should be open)

PS42 With the EPC in off mode puta jumper between XC- X7:4 and push thestart button.

26

4 Alarm Tests

Use the following guide for testing alarmfunctions by activating them. Alarms areprovoked by one or more actions (A, B and soon) as shown in the right columno however,certain alarm functions can not be testedwithout being disconnected.

N.B. If the alarm functions are to bedisconnected in the control unit, becareful to avoid a short-circuit.

The recommendation is to test the alarms

L-

every 3 months. '"FwLED alarm Display alarm Function Sensor Actions to provoke an alarm .:*i

@High oil pressure PS41 Increase back pressure.

@Low oil pressure (lowflow)

PS42 A. Stop oilfeed pump.

B. Ghange V1 position by reducingair pressure

C. Reduce the back pressure.-:'

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Sludge discharge failure PS42 1. Disepnnect hose for openingwater (MV15).

2. Initiate a sludge discharge.

@Water transducer fault MT4 Disconnect cable to XE:4 (the test

signalto MT4).

@Emergency stop X52 Press the emergency stoP tiuttqn.

@Vibrations (option) XS1 Tap on the vibration switch three

times within one second.

NHeater fault 1. Start the heater.

2. Disconnect cable to X9:3.

4 Alarm Tests FOPX Alarms and Fault Finding

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LED alarm Display alarm Function Sensor Actions to provoke an alarm

@High or low oiltempera-ture (option)

TT1 A. Remove sensor from pipe andput into hoVcool liquid.

B. Change alarm limit parameters(P5 = mdx temp., P6 = min.temp.) in relation to actualtemperature. For moreinformation see "Parameter

List'.

N.B. Reset the parameter valuesafter test.

Communication error Remove fuse 42:F3 (rear board).

A/Dconvers ionerror Remove fuse A1:F2 (front board).

Programming error Leave the mode selector switch inposition P for 30 minutes.

Power failure Switch the power to the EPC off andon when it is in operation.

Temperature deviation TT1 -TT2 Remove one sensor from pipe to cooloff or be heated up (temp. diff. morethan 30'C/54'F).

High water fansducer(MT4) value (above400).

MT4 Touch the central screw in the MT4connection box.

Low water transducer(MT4)value (below1 00).

MT4 Disconnect cable to XE:3 in EPC.

Insufficient amount ofdisplacement water

MT4 A. Change parameter 70 to a lowvalue (e.9. 5 seconds) andinitiate discharge cycle twice.

B. Close displdcement watersupply and wait 2 dischargecycles.

The amount of displacement watersupply is checked every 2nd dis-charge.

Extra alarm A. Activate appropriate sensor.

B. Disconnect cable X7:1.

PS42 faulty at start(Gircuit should be open)

PS42 With the EPC in otf mode put a jumper between XC- X7:4 and push thestart button.

\ -

26

IIi

5 Test Program

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

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

5.1 How to Start the TestProgram

N.B. The test program is only to be usedwhen the separation system is out ofoperation.

To run the test program, do as follows:

1. Open the control unit door.

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

3. Press simultaneously the discharge and thealarm push-buttons, and keep thempressed.

4. Switch the power on.

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

f-fr3:

27

5 Test Program FOPX Alarms and Fault Finding

5.2 Lamp TestThe 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 segmentindividually lit (see the picture).

. Each group of LED:s and displaysegments lit.

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

5.3 How to ActivateDifferent Parts of theTest Program

Use the push-buttons to activate different partsof the test program (see the figures I,2 and 3in the picture).

l. Push button I to step from function I tofunction 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? to step forward within eachfunction in the test program, for instancefrom function l.l to 1.2.

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

28

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FOPX Alarms and Fault Finding 5 Test Program

5.4 Functions in the TestProgram

1. Memory

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2. Digital inputs

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aMemory correct

Memory tault

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Function

1.1 PROM

1.2 lnternalRAM

1.3 External RAM

1.4 EEPROM

Circuit open

Ciruit closed

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Function Terminal Unit Gorrectvalue

2.1 Low flow X7:4-XC PS42 0

2.2 High pressure X7:3-XC PS41 1

2.3 Not in use

2.4 Not in use

2.5 Emergency stop or Vibrationswitch

X8:4-XC XS2 orXS1

1

2.6 Not in use

2.7 Start or stop EPC X8:2-XC Remoteswitch

0

2.8 Start or stop heater X8:1-XC Remoteswitch

0


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3. Digital inputs

4. Mode selector

Circuit open

Circuit closed

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Function Terminal Unit Correctvalue

3.1 Alarm acknowledge or Reset X9:4-XC Remoteswitch

0

9.2 Heater fault X9:3-XC I

3.3 Sludge discharge X9:2-XC Remoteswitch

0

Remote position

Localposition

Program position

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Function

4.1 Remote (R) position

4.2 Local (L) position

Program (P)position

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30

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FOPX Alarms and Fault Finding 5 Test Program

5. Digital outputs

Use push-button 3 to activate or deactivateeach output (see "How to Activate DifferentParts 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 eachoutput. (See "How to Activate Different Partsof the Test Program" on page 28.)

L-,, N.B. Corresponding green LED is not lit.

31 II

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Circuit deactive

Circuit active

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Function Terminal Unit

5.1 Oilfeed X4:4-XD MV1/V1

5.2 Water drain X5:1-XD MV5

5.3 Displacement or sealing watersuPPIY

X5:2-XD M V l O

5.4 Opening water X5:&XD MV15

5.5 Closing water X5:4-XD MV16

5.6 Steam shut-off valve or Heatpacfixed load

X6:1-XD

5.7 Steam valve decrease or Heatpacfixed load

X6:2-XD

5.8 Steam valve increase or Heatpacfixed load

X6:3-XD

Circuit deactive

Ciranit active

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6.1 Heatpac variable load X6:4-XD

6.2 Heatpac alarm blocking duringstart

X4:2-XD K15 inpowerunit

6.3 Not in use

6.4 Separator stop X1:1-2

6.5 Not in use

6.6 Remote/commonalarm X2:1-2

6.7 Blocking vibration switch X2:*4 XS1

7. Not in use

5 Test Program .FOPX Alarms and Fault Finding

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8. Analog inputs

To simulate the temperature sensor elements(Pt 100) in 8.1 and 8.2, a resistor can be used.Separate plug connectors with appropriateresistors are included in the test module kit.

Resistor Ref.temp Displayreading

110 c) 25 "ct77 "F 60140 c) 104'ct2t9.F 215

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 (ora very low value) or 255 indicates a seriousfault.

A normal value for function 8.3" Reference4 V should be 195 - ?lln

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The table below shoftJlibw to find the fault.

For instance, if the display shows "000" forfunction 8.1, 8.2 and 8.3, it must be either ablown fuse or A/D converter fault. Check it inthis order:

l. If the fuse is blowno replace it.

2. If the fuse is correct, replace the controlmodule.

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

Function Terminal Unit Fuse A1:F2blown

A/D conver-sion faulty

Input open Input shortcircuit

8.1 Temperature sensor forcontrol

X10:1-2-3TT2 000 000 255 000

8.2 Temperature sensor foralarm

X11 :1 -2 -3TT1 000 000 255 000

8.3"' Reference 4 V 000 000 1 9 5 - 2 1 5 1 9 5 - 2 1 5

8.4 Not in use

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FOPX Alarms and Fault Finding, 5 Test Program I

BCircuit @rrect

Circuit fault

E


9.1 Not applicable(The display will show an E).

X14 :1 -3

9.2 RS 232 CMeasure -10 to -12V DCon X14:1-3 (Circuit correct).

X 1 4 : 1 - 3

t

9. Serial communication

N.B.

N.B. Disconnect the communication cableand put a jumper between Xl4:3-4before the test is carried out.

!

1

{

F

E

After the test. remove the terminaljumpers and connect communicationcables.I

33

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10;-Test of EPROM (rear circuit board)

11.Test of internal RAM in GPU (rearcircuit board

. ' , ' . ' i

12.Test of"exftllnal RAM in GPU (rearcircuit board)

, 13.Test of lC 8255 l/O port (rear circuitboard)

14. Low reference analog input(internal)

A value between 42 and66 is displayed, when

, it is correct.

u

l. 15. High referience analog inputI (internal)

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

F. l6.Transducer signal (internal)hr

i fne display shows 100 + -50 with oil in WT' 200 and 55 + 10 with air, when it is correct.

?t

ftIF

;B

Circuit correct

ECiraitfault

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1 iJ4.x

i

, k? , Q+ , -r t )

>xu l

1

I r - to ' t

7 ' ! ! .

( i orr

34

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Alarms and Fasult Finding

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Transcript of Alarms and Fasult Finding