ALARM AND TROUBLE SHOOTING

GE Power SystemsGas Turbine

April 2000Replaces ATCMKV_VI

GEK 107359

These instructions do not purport to cover all details or variations in equipment nor to provide for every possiblecontingency to be met in connection with installation, operation or maintenance. Should further information be desired orshould particular problems arise which are not covered sufficiently for the purchaser’s purposes the matter should bereferred to the GE Company. © 2000 GENERAL ELECTRIC COM PANY

Annunciator Troubleshooting Chart

GEK 107359 Annunciator Troubleshooting Chart

2

/HMI Alarm Message, Logic & No. Cause ActionÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L63ADL_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Atomizing Air Diff. Pressure Low

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Atomizing air compressornot providing adequatepressure.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check atomizing air system.


L26AAH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Atomizing Air Temp.High

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure of atomizingprecooler louvers to openand close.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check water supply to theatomizing air precooler,isolating valve position flowrestrictions.


L86S ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Auto Synchronizing Lockout


Auto synchronizingself-checking system hasdetected a synchronizingequipment abnormality.


Investigate synchronizationsystem to determine exactcause of problem.


L52HQ_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Auxiliary Hydraulic OilPump Motor Running


Accessory gear-drivenhydraulic pump has notsupplied sufficientpressure because of leaksor failure of pump.


Check hydraulic system.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L52QA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Auxiliary Lube Oil PumpMotor Running

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

The main accessory geardriven lube oil pump issupplying insufficientlube oil pressure due topump failure or leaks

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Examine main lube pump.Check pump output and mainlube filters for leaks orplugging.


L49X_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Auxiliary MotorOverload


One of the auxiliarymotors is overloaded.


Check auxiliary motors todetermine which motor isoverloaded and the cause ofthe overloading.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L52QS_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Auxiliary Seal Oil PumpRunning


Insufficient pressure frommain seal oil supplypump.


Check seal oil supply systemcomponents.



Battery 125 VDC GroundÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Insulation failure hasresulted in a ground onthe 125 VDC system.


Isolate and remove groundfrom the system.


L27BLN_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Battery Charger ACUndervoltage


Battery charger ACundervoltage.


Check battery charger ACbreaker. Check voltagemagnitude.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Battery DC UndervoltageÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Battery system voltage islow. Battery charger isnot functioning properly,excessive drain on thebatteries, or bad cells inbattery.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check battery charger forproper operation, correctexcessive drain on battery,check for bad cells. The gasturbine should not beoperated unless DC power isavailable to the emergencyDC lube oil pump.

Annunciator Troubleshooting Chart GEK 107359

3

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L30LOAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Bearing DrainTemperature High

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High bearing draintemperature.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check lube oil feed and drainpiping.



Bearing MetalTemperature High


Bearing or lube oilproblem.


Check bearings and lube oilsystem.


L27VVN_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Black Start InverterTrouble


The black start inverteroutput voltage has gonelow, ignition power hasbeen transferred to theMCC 12 VAC.


Troubleshoot black startinverter.


L27BN_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Bus Undervoltage – No Auto Synch


Bus synchronizingpotential not available.


Check bus PT fuses andwiring. Do not use autosynchronizing or manualsynchronizing until problemis resolved.


L28FD_SD ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Chamber Flamed OutDuring Shutdown


Flame loss during firedshutdown period.


Investigate cause and remedybefore restarting turbine.Monitor vibration on the wayup.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L30SPA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Combustion Trouble ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Faulty thermocouples, gaspath hardware or unevendistribution of fuel to thefuel nozzles.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Analyze data for trends. Atearliest shutdown checkthermocouples. Performborescope or combustioninspection. Check flowdivider fuel pressures. Checkfor plugged nozzles.


LCOM_B_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Common IOCommunication Loss(MKV Control Only)


<C> processor is nolonger communicating.


Check <C> power supplycard and cabling.


L86TCI ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Compressor InletThermocouples Disagree


Bad thermocouple signal.Thermocouples in theinlet have failed, shortedor open.


Check thermocouples andwiring and replace faultythermocouple(s).


L86CB1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Compressor Bleed ValvePosition Trouble


Compressor bleed valveshave not operatedproperly. They are in thewrong position orrequired an excessiveamount of time to movefrom one position to theother.


Investigate problem. Theproblem should be correctedbefore restarting. The MasterReset switch must be pressedbefore restarting.


4

/HMI Alarm Message, Logic & No. ActionCause

L30 COMM_IO_R VCMI I/O StateExchange for <R> failed(MKVI Only)

<R> Processor is nolonger communicating.

Check <R> power supply,cards, and cabling.

L30 COMM_IO_S VCMI I/O StateExchange for <S> failed(MKVI Only)

<S> Processor is nolonger communicating.

Check <S> power supply,cards, and cabling.

L30 COMM_IO_T VCMI I/O StateExchange for <T> failed(MKVI Only)

<T> Processor is nolonger communicating.

Check <T> power supply,cards, and cabling.


L26CTH_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Control Panel Temp HighÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Air conditions notmaintaining propertemperature.


Check air conditioners.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L12HF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Control Speed Signal Loss - HP


Machine tripped due toloss of speed signal.


Check wiring to speedpickups.


L12HFD_C ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Control Speed SignalTrouble - HP


HP speed pickup votingmismatch in <Q>.


Check and recalibrate HPspeed pickups.


L12HFD_P ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Protective Speed SignalTrouble - HP


HP speed pickup votingmismatch in .


Check and recalibrate HPspeed pickups.


L12LFÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Control Speed SignalTrouble - LP


LP speed pickup votingmismatch.


Check and recalibrate LPspeed pickups.


L30CDÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Cooldown TroubleÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Unit failed to go oncooldown, or thecooldown cycle wasaborted prior to cooldowntimer timeout.


Check ratchet system.Monitor vibration whencooldown cycle is reinitiated.


L52FC_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Cooling Fan MotorBreaker Open


Cooling fan motor did notstart.


Check cooling fan motormodule in PECC.


L71WL_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Cooling Water Level LowÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Cooling water tank levellow.


Check cooling water systemfor leaks.


L63QQ3H_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Coupling Oil Filter DiffPressure High


Clogged filter.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Replace filter.


L3CP_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Customer Start InhibitÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Customer contact inputnot enabled.


Check customer’s permissive.


L4CT_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Customer Trip ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Customer trips input tothe L4CT logic havecaused an automatic tripof the unit.


Determine which of thecustomer trip devices causedthe trip and correct.


5

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L27QEL_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

DC Motor Undervoltage(Lube Oil)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

DC power not supplied toemergency DC lubepump.


Check power to DC lubepump (MCC breaker on). Thegas turbine should not beoperated unless DC power isavailable to the emergencyDC lube pump.


L30DIAG_C ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diagnostic Alarm <C>(Mark V Control Only)


The microprocessor self-checking program hasuncovered a control panelproblem.


Call up diagnostic display.


L30DIAG_QÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diagnostic Alarm <Q>(Mark V Control Only)


The microprocessorself-checking programhas uncovered a controlpanel problem.


Call up diagnostic display.


L26DWH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Engine CoolingWater Temp High


Diesel cooling watertemperature is high.


Check diesel cooling watersystem.


L2DWZ2ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Failure to BreakTurbine Away


Diesel was unable toaccelerate to maximumrpm.


Check diesel. Check dieselmaximum torque solenoid.


L48DSXÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Failure to StartÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁDiesel has failure to start.


Check diesel fuel tank.


L4DEY_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Failure to Stop ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel should stopautomatically after a 5minute cooldown period.


Check diesel stop solenoid20DV.


L63QDN_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Lube Oil Pressure Low


Diesel lube oil pressure islow.


Check diesel lube oil system.


L83DT1ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Diesel Test Mode Selected


Indication that diesel testpushbutton permissivehas been activated.


Test mode should bedeselected once the test iscomplete.


L63LF2H_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Distillate Fuel FilterDifferential Pressure High



Replace filter.


L26FD1H_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Distillate FuelTemperature High


Possible cooling systemproblem.


Check temperature sensorand cooling system.


L12HÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Electrical Overspeed Trip - HP


The speed control systemhas not limited HPturbine speed within thetrip limits.


Isolate problem and correct.


L12LÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Electrical Overspeed Trip - LP


The speed control systemhas not limited LP turbinespeed within the triplimits.




6


L72QEZ_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Emergency Lube OilPump Motor Running


Loss of AC power tomain lube oil pumps.


Determine cause of ACpower loss.


L72ES_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Emergency Seal Oil Pump Running


Generator seal oilpressure is low.


Check main and auxiliaryseal oil supply systemcomponents.


L59E_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exciter OvervoltageÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Excessive field volts havebeen detected.


Check exciter.


L94EK ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exciter Rect CoolingTrouble - Trip 52G


Breaker has tripped andmachine is at FSNLbecause of problem withexciter rectifier cooling.


Investigate exciter rectifiercooling system.


L26SFH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exciter Rectifier BridgeTemp High


Possible cooling systemproblem.


Check exciter rectifiercooling system.


L86TXT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust OvertemperatureTrip


Turbine has tripped due tohigh median exhausttemperature.


Investigate.


L86TXT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust OvertemperatureTrip


The temperature controlsystem has not limitedexhaust temperaturewithin the trip limits.




L63TK_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust Frame CoolingAir Pressure Low


Exhaust frame blowermotor not operating. Airpassages blocked.


Check motor operation.Inspect cooling air flowpassages.


L90TKLÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust Frame CoolingSystem Trouble - Unload


Exhaust frame coolingfans 88TK-1,2 problem orsystem problem.


Investigate exhaust framecooling system.


L63EAH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust Pressure HighAlarm


Exhaust pressure hasrisen above recommendedlevels.


Inspect exhaust filter andducting for blockage.


L63ETHÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust Pressure HighTrip


Exhaust pressure hasrisen above the trip level.


Inspect exhaust filter andducting for blockage.


L63ETHX_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust Pressure SwitchTrouble


Bad signal from exhaustpressure switch.


Check switches and switchwiring.


L30TXA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust TemperatureHigh


The exhaust gastemperature is excessive.


Check all thermocouples.Replace any badthermocouples. If problem isnot thermocouples, isolateportion of Control Systemcausing the problem.


L30TXAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust TemperatureHigh


High median exhausttemperature calculated in.


Lower load to reduce exhausttemperature. Investigate.


7


L30SPTAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust ThermocoupleTrouble


Faulty thermocouple.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check thermocouples.


L86TFBÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Exhaust ThermocouplesOpen Trip


Excessive number ofthermocouples notconnected.


Check and reconnectthermocouples.


L63FLZ_FLTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure to Establish Liquid Fuel Press.


Liquid fuel forwardingsystem problem.


Check that power is beingsupplied to liquid fuelforwarding pump/motor.Troubleshoot per systemcomponents per instructions.


L30FD_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure to Ignite ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure to fire within theone minute period.


Check that ac power issupplied to the ignitionsystem.


L62TT2_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure to Start ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

The master protectivelogic signal “L4” has notbeen set within 30seconds of the startsignal, has tripped theunit twice or, if the unit isoperating in remote,flame was not establishedafter two tries.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check all signals making upthe L4 logic signal todetermine which caused theproblem, or determine causeof lack of flameestablishment.


L3Z ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure to Synchronize ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Unit did not synchronizeand close generatorbreaker within the normalexpected time (15seconds).


Check all signals goingmaking up the L4 logic signalto determine which causedthe problem or determine thecause of lack of flameestablishment.


L45FTX2_ALML45FTX1_ALM


Fire in Zone #1 or Zone #2 Trip


Fire in the turbine oraccessory compartment.


Restarting after an operationof the CO2 system requiresthat the CO2 system be reset,including all doors anddampers, and the CO2 releasemechanism.


L45FAX_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Fire Protection SystemInoperative


CO2 pressure or controlproblem.


Check fire protection system.


L28FD_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Flame Detector Trouble ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

One of the detectorsoperating when no flameis present.


Check for proper operation ofthe flame detection system.Check that the flame detectorquartz window are clean.


8

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L60FSRGÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

FSR Gag Not at MaxLimit


Manual FSR control hasnot been reset to aposition where it will notinterfere with automaticFSR control.


Raise the manual FSR controlto maximum.


L3GCVFLT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Control Valve ServoTrouble


The gas control valvefeedback signal isabnormal.


Check LVDT.


L63HGL_SENSR ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel HydraulicPressure Switch Trouble


Bad signal from hydraulicpressure switch.


Check switch and switchwiring.


L63HGL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Hydraulic TripPressure Low


Low oil pressure in gasfuel hydraulic oil tripcircuit.


Check the control oil filterand control oil piping. Thisalarm will actuate if theturbine is tripped with themanual emergency trip valveon the turbine or a large leakwere to occur in the hydraulictrip circuit piping.


L3GFIVP ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel IntervalvePressure Trouble


Pressure sensed betweenthe gas control valve andthe speed ratio valve isabnormal.


Check GRV control system,intervalve vent, and pressuretransducer.


L63PGFT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Nozzle PurgeSystem Pressure High


Problem with valves. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Determine cause of incorrectvalve positioning.


L94PGT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Nozzle PurgeSystem Trouble Trip


Either VA13-1 or -2 or20VG-2 are stuck openand machine has tripped.Gas may be backingthrough the system.


Check valves for cause.Correct positioning prior torefire.


L33PGFT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Nozzle PurgeValve Fail to Close


VA13-1 or -2 areobstructed.


Check valves to removeobstruction to resume purge.


L33PGO_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Nozzle PurgeValve Fail to Open


No atomizing air flow;VPR44-1 stuck.


Check valve.


L63FGL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Fuel Pressure LowÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas fuel pressure toturbine has been sensed aslow.


Check cause of low supplypressure.


L3GRVFLT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gas Ratio Valve PositionServo Trouble


The gas ratio valvefeedback signal isabnormal.


Check LVDT.


L63CA3L_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gen Air Filter CleanerPressure Low


Generator air inlet filtercleaning systemproblems.


Check air inlet filter cleaningcomponents.


9


L43HPA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gen Purge System onManual Control


Operator has selectedmanual control.


Change to automatic control.


L52GA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Gen. Inlet Air DirtSeparator Not Running


Generator inlet air dirtseparator malfunction.


Check separator motor forproper operation. Checksupply system wiring.


L63GFH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator Air Filter HighPressure Drop


High pressure differentialacross generator air inletfilters.


Inspect and clean/changefilter elements, as required.


L63BQL_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator BearingVacuum Low


Generator bearings aresealed by vacuum. Thisalarm indicates a potentialproblem with the sealingsystem.


Investigate generator bearingsealing system.


L52G_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator BreakerTripped


Generator breaker hasbeen tripped by anautomatic protectivedevice or manually.


Determine device that trippedthe breaker.


L63GKL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator CasingHydrogen Press. Low


Low hydrogen pressure ingenerator.


Check hydrogen supplysystem.


L71WGH_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator Casing LiquidLevel High


Liquids have accumulatedin bottom of generator.


Remove liquids, check forleaks and take action toprevent recurrence ofproblem.


L33GCC_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator CO2 DoorTrouble


Generator CO2 door isclosed.


Door must be opened and thelatch reset.


L86TGT_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator DifferentialTrip


A generator panelprotective device hastripped the 86G lockoutrelay.


Determine which protectivedevice tripped the 86G andcorrect the abnormality thatprecipitated the trip.


L64F_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator Field GroundÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

A ground on thegenerator field has beendetected.


Operation of the generatorwith the field grounded is notrecommended as a secondground could result inexcessive damage to thegenerator field.


10

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L94H_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator HydrogenPurge Shutdown

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Shutdown initiated due toone or more hydrogensystem problems, e.g.,hydrogen purity has fallento shutdown level.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check hydrogen cabinet forundervoltage. Checkhydrogen control switch inmaintenance/auto. Check andrestore hydrogen purity.Check seal unit. If puritycontinues to deteriorate, apossible hazard conditionmay develop.


L49GH_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator Stator TempHigh


Generator statortemperature is excessivecaused by lack of coolingor overload.


The generator should not beoperated when the statortemperature is excessive.Check cooling system, reduceoverload on generator.


L94GEN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Generator VentilationTrouble Shutdown


Temperature in generatorcompartment exceedslimits. Vent fansinoperable or insufficientto handle ventilationrequirements.


Check generator ventilationsystem for proper fan/motoroperation. Check ventilationdampers for properoperation/position.


L63FU2LAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Heavy Fuel Pressure Low,Auto Xfer to Dist


Problem with heavy fuelsystem.


Investigate heavy fuelsystem.


L26FU2LAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Heavy Fuel Temp Low,Auto Xfer to Dist


Problem with heavy fuelsystem.


Investigate heavy fuelsystem.


L3FUZÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Heavy Fuel TransferPermissive Trouble


Turbine unable to transferto heavy fuel.


Check heavy fuel system. Besure fuel is warm andfree-flowing.


L30SPTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High Exhaust Temp.Spread Trip


Faulty thermocouples, gaspath parts or unevendistribution of fuel to thefuel nozzles.


Analyze data for trends.Perform borescope orcombustion inspection.Check flow divider, fuelpressures. Check for pluggednozzles.


L39VA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High Vibration Alarm ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High vibration at one ormore bearings.


Monitor vibration readings.


L39VTX_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High Vibration Trip orShutdown


High vibration due tobowed rotor, mechanicalimbalance, bearingfailure, etc.


Check that the hydraulicratchet is operating properly.Check for mechanicalfailures, observe vibrationlevel on the next startup.


11

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L30TNH_DIFFÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

HP Speed SignalDifferential Alarm


One of the HP speedsensors is showing adifferent speed than theother two.


Check HP speed pickups.


L63HF1H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydraulic FilterDifferential Pressure High


Clogged filter. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Loss of fluid pressure anddeterioration of fluid puritymay result. Change filter.


L86HD ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydraulic ProtectiveTrouble


One second after thehydraulic oil trip isinitiated either the liquidfuel stop valve is notclosed or the hydraulictrip pressure (63HG,63HL) has not decreasedsufficiently.


Check operation of 20FL and20HD servos.


L63HQ1L_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydraulic Supply Pressure Low


Hydraulic supply pressureis low.


Check hydraulic supplypressure filter and differentialpressure gauge, regulatingvalve or pump.


L27GHN_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydrogen Control PanelUndervoltage


Ac power supply voltagelow.


Check power supply forproper operations. Checkwiring.


L63GL_GH_AL ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydrogen Pressure Highor Low (Gen)


High machine gaspressure or low manifoldgas pressure.


Check generator hydrogensystem.


L63HHL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydrogen Pressure Low(Skid)


Hydrogen supply skidpressure low.


Check skid components forproper operation.


L30HP ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Hydrogen Purity TroubleÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Bad generator hydrogenpurity or purity pressure.


Check generator hydrogensystem.


LWLX4MINÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Injection to Fuel RatioLow-Four MinuteAverage


Steam (water) injectionflow four minute averagelow.


Check steam (water) injectionsystem.

LWLXHR Injection to Fuel RatioLow-Hourly Average

Steam (water) injectionflow one hour averagelow.



L86GVAÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Inlet Guide Vane ControlTrouble Alarm


IGV control systemproblem.


Check IGV control system.


L4IGVTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Inlet Guide Vane ControlTrouble Trip


IGV control systemproblem.


Check IGV control system.


L3IGVFLT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Inlet Guide Vane PositionServo Trouble


Incorrect servo operation.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check servos.


12


L30TNI_DIFFÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

IP Speed SignalDifferential Alarm


One of the IP speedsensors is showing adifferent speed than theothers.


Check IP speed pickups.


L71WG_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Detected inGenerator


Excessive liquid inbottom of generator.


Remove liquid and takecorrective action to preventrecurrence of problem.


L3LFLT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel Control FaultÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid fuel checkingsystem has detected anabnormal servo or LVDTposition or signal.


Determine abnormalcondition by reading signals(L3LFLT1 to L3LFLT5).


L63LF1H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel FilterDifferential Pressure High





L30FQL_DIFF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel FlowDifferential Alarm


Speed pickups on flowdivider disagree.


Check and recalibrate speedpickups.


L63HL_SENSR ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel HydraulicPressure Switch Trouble


Bad signal from hydraulicpressure switch.


Check switch and switchwiring.


L63HLL_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel HydraulicTrip Pressure Low


Low oil pressure in liquidfuel hydraulic oil tripcircuit.


Check the control oil filterand control oil piping. Thisalarm will actuate if theturbine is tripped with themanual emergency trip valveon the turbine or a large leakwere to occur in the hydraulictrip circuit piping.


L63FLZ_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel Pressure LowÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid fuel forwardingsystem problem.


Check fuel forwardingsystem components forproper operation. Checkliquid fuel forwarding pipingfor leaks.


L3LFP_FLT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel PumpControl Trouble


Problem with one or morecontrol devices.


Troubleshoot liquid fuelpump control components todetermine problem andcorrect.


L33FL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel Stop ValveFailure to Open


Valve or control failure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check operation of VSI andcontrols.


L26FL2LA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Liquid Fuel Temp Low,Auto Xfer to Dist


Heavy fuel temperature islow. Unit has beenautomatically transferredto distillate fueloperation.


Check heavy fuel supplyheating equipment.


13

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L3TFLTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Loss of CompressorDischarge Pressure Bias


Bad signal fromcompressor dischargepressure transmitter.


Check transmitter andassociated connections forproper bias signal.


L3DWRFÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Loss of External SetpointLoad Signal


ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ


L28FDTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Loss of Flame TripÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Failure of one of thedetectors to detect flame.


Check for following: fuelbeing supplied to thecombustors, flame in allchambers, damaged crossfiretubes, or combustors. Checkfor proper control valveposition and fuel pressure.


L63QTX ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Low Lube Oil PressureTrip


Lube oil pressure hasfallen below the trip level.


Determine cause and correctbefore restarting unit.


L30TNL_DIFF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

LP Speed SignalDifferential Alarm


One of the LP speedsensors is showing adifferent speed than theother two.


Check HP speed pickups.


L26QA_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Header TempHigh


Lube header temperatureabove recommendedlimits.


Check for proper operation ofthe lube oil heat exchangers,cooling water fans (properrotation) and temperatureregulating valve.


L26QT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Header TempHigh Trip


Lube header temperatureabove recommendedlimits.


Check for proper operation ofthe lube oil heat exchangers,cooling water fans (properrotation) and temperatureregulating valve.


L71QH_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Level High ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube oil tank level high.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Investigate cause of highlevel alarm and restorenormal level.


L71QL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Level Low ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube oil tank level low. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check for leaks, restorenormal level.


L63QA1L_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Pressure Low ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube system leaks orpump trouble.


Repair leaks or pump.


L63QT_SENSRÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil Pressure SwitchTrouble


Bad signal from lube oilpressure switch.




L26QN_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil TankTemperature Low


Lube tank temperaturebelow recommendedlimits (see pipingschematic).


Check for proper operation ofthe lube oil tank heaters.Starting is inhibited if thetank temperature is low.


14


L26QT_SENSRÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Lube Oil TemperatureSwitch Trouble


Bad signal from lube oiltemperature switch.




L63QQ1H_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Main LO Filter DiffPressure High





L43MAINTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Maintenance - ForcingMode Enable


Auto calibrate, memorychanging or logic forcingmode of operation hasbeen selected.


When done with theoperation, deselect theoperation.


L86MAN_SYNCÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Manual SynchronizingLockout


Manual synch lockout hasbeen selected on OperatorInterface. Breaker willnot close.


Determine why manual synchhas been locked out. Resetusing Master Resetpushbutton on OperatorInterface.


L5E_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Manual Trip ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

The emergency stoppushbutton has beenpressed.


Correct abnormality thatcaused the operator to pushthe emergency stoppushbutton.


L86MP ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Master Protective StartupLockout


Within the turbine controlpanel the threemicroprocessorcontrollers R, S and T arein disagreement for theproper condition of theMaster Protective logic“4X”.


Determine which controller isin disagreement with theother two.


L27MC1N_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

MCC Undervoltage ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Motor control centerundervoltage.


Check that power is suppliedto the motor control center.


L30LTA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

No. 3 BearingTemperature High


High number 3 bearingtemperature.


Check lube oil feed and drainpiping.


L33BS_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

No. 3 Drain ValvePosition Trouble


Valve incorrectlypositioned.


Check drain valve operations.


L3NZFLTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Nozzle Control ServoTrouble


Problem with secondstage nozzle servo.


Check servo wiring andhydraulic oil system.


L43DIAG_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Off-Line DiagnosticsRunning


Off-line diagnosticoperation has beenselected.


Do not start unit untildiagnostics are complete.


L3WCTIM_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

On Line Water WashInhibited


Ambient temperature isbelow 50 deg F.


Wait to water wash untilambient temperature ishigher.


15


L12HBLT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Overspeed Bolt Trip - HPÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

The speed control systemhas not limited turbinespeed within the triplimits.




L83HOST ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Overspeed Test ModeSelected - HP


HP overspeed trip beingtested.


See “Overspeed Trip Checks”section of text.


L83LOSTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Overspeed Test ModeSelected - LP


LP overspeed trip beingchecked.


See “Overspeed Trip Checks”section of text.


L30EKÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Prim Exciter RectCooling Fan Trouble


Problem with primaryexciter rectifier coolingfan.


Determine and correctproblem with primary exciterrectifier cooling fan.


L4ETR_FLTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Protective Module ETRRelay Trouble


Trip due to masterprotective relay (4’s)circuit has a problem.


Isolate ProtectiveModule and correct theproblem.


L12H_P_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Protective ModuleOverspeed Trip - HP


 module HPoverspeed trip.


Investigate cause ofoverspeed.


L12L_P_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Protective ModuleOverspeed Trip - LP


 module LPoverspeed trip.


Investigate cause ofoverspeed.


L12LF_OS ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Protective Speed SignalTrouble - LP


LP speed pickup votingmismatch in .


Check and recalibrate LPspeed pickups.


L30HRX2 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet Did Not Start ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet did not initiate aratchet stroke in theprescribed time.


Check ratchet permissives.


L49HR1A_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet Motor OverloadÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet motor overload.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check ratchet motor overload(MCC). Check for properoperation of ratchetmechanism.


L30HRX1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet Trouble ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Ratchet did not completea prescribed motion innormal time.


Check for proper operation ofratchet mechanism.


L30RHFLTX ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Relative Humidity SensorFault


Humidity sensor failure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check sensor and wiring.


R5E_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Remote Emergency TripÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Unit was tripped with theremote emergency trippushbutton.


Investigate and correct causeof trip. Manually resetpushbutton.


L63SAL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Seal Oil Diff. PressureLow


Low seal oil pressureacross bearings.


Check seal oil system.


L63STÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Seal Oil Diff. PressureLow Shutdown


Seal oil pressure acrossbearings has reachedshutdown setpoint.


Correct seal oil systemproblem before restarting.


16


L71SDH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Seal Oil Drain LiquidLevel High


Seal oil drain systemproblem.


Check generator seal oil drainsystem.


L63STX_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Seal Oil Press. ShutdownSwitch Trouble


Bad signal from seal oilpressure switch.




L30WC_LAG ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Standby Cooling WaterPump Running


Either low cooling waterpressure, or a problemwith the main coolingwater pump.


Investigate problem withcooling water system or maincooling water pump.


L30FD_LAGÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Standby Dist Fuel FwdPump Running


Low distillate fuelpressure or problem withmain dist fuel fwd pump.


Investigate fuel forwardingsystem and main pump.


L4DTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting Device LockoutÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ


L3SMT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting Device Trip ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

The turbine has beentripped because thestarting device has failedto start the turbine.


Note where in the startsequence the turbine trippedto aid in determining cause oftrip. Check the suspectsystem.


L4CRTÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting Motor BreakerDid Not Pick Up


Starting motor did notstart.


Checking starting motormodule in PEECC.


L49CR_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting Motor OverloadÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting motor is showingan overload.


Investigate starting motorcircuits.


L86CRTX ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Starting Motor ProtectiveLockout


Cranking motor circuitelectrical fault.


Clear fault and reset 88CR.


L2SFT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Startup Fuel FlowExcessive Trip


Excessive fuel for startuphas been detected. For gasfuel the gas control valveis open too far.


Check the servo and feedbacksignals for proper operation.


L30EKR ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Stby Exciter Rect CoolingFan Running


Problem with primaryexciter rectifier coolingfan.


Determine and correctproblem with primary exciterrectifier cooling fan.


L60APHA_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -High Pressure


High steam pressure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Reduce steam pressure.


L60APHT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -High Pressure Trip


Steam augmentationsystem tripped due tohigh pressure.


Correct problem beforerestarting steamaugmentation.


L60ATHT ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -High Temp. Trip


Steam augmentationsystem tripped due tohigh temperature.




L60ATHA_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -High Temperature


High steam temperature.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Reduce steam temperature.


17


L60APLA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -Low Pressure


Low steam pressure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Increase steam pressure.


L60ALPT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -Low Pressure Trip


Steam augmentationsystem tripped due to lowpressure.




L60ATLT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -Low Temp. Trip


Steam augmentationsystem tripped due to lowtemperature.




L60ATLA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Augmentation -Low Temperature


Low steam temperature.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Increase steam temperature.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L60WL1_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Flow High ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁExcessive steam flow. ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁCheck steam system.


L60WQPL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Flow HighLockout


Excessive steam flow. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Correct problem beforerestarting.


L30SJÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Injection NotSelected


NOx control steaminjection systeminoperative.


Select Steam Injection onOperator Interface.


L60SPHA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Pressure HighÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

High steam pressure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Reduce steam pressure.


L60SPHT_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Pressure HighLockout


High steam pressure. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Correct steam pressure beforerestarting.

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L60SPLA_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Pressure Low ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁLow steam pressure. ÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁIncrease steam pressure.


L60SPLT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Pressure LowLockout


Low steam pressure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Correct steam pressure beforerestarting.


L60STHA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Temperature HighÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁHigh steam temperature.


Reduce steam temperature.


L60STHT_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Temperature HighLockout


High steam temperature.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Correct steam temperaturebefore restarting.


L60STLA_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Temperature LowÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Low steam temperature.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Increase steam temperature.


L60STLT_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam Temperature LowLockout


Low steam temperature.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Correct steam temperaturebefore restarting.


LWLXHR ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Steam to Fuel Ratio Low– Hourly Average


Steam (water) injectionflow one hour averagelow.




L63QQ2H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Trip Oil Filter DiffPressure High


Clogged filter. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Replace filter.


L63TF1H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine Air InletDifferential PressureAlarm



Replace filter.


18

/HMI Alarm Message, Logic & No. ActionCauseÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

L63TFH_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine Air InletDifferential PressureShut-Down


Clogged or iced filter.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Determine cause of blockage.


L63TFH_SENSRÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine Air InletDifferential PressureSwitch Trouble


Bad signal fromdifferential pressureswitch.


Check switch calibration andswitch wiring.


L30TFXÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine Air Inlet TroubleÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Inlet filter excessivepressure drop or inletfilter motor overloaded orinlet compartment bypassdoor is not in properposition.


Check the following:

Inlet filter for blockage.

Inlet filter motor for properoperation.

Inlet house bypass door.


L26BT1H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine CompartmentTemp High


Compartment temperatureexcessive.


Check cooling air fan forproper operation.


L83KU_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine CompressorAbrasive CleaningSelected


Compressor beingcleaned.


Turn function off whencleaning is complete.


L48 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine IncompleteSequence


Failure of unit to reachcomplete sequence.


Check equipment which iscausing the problem in thenormal sequence.


L3A ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine Underspeed ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Turbine has boggeddown.


Reduce the load that will beapplied to the generatorbefore reclosing the generatorbreaker.


L39VD3_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Vibration – Start InhibitÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Vibration protectionsystem problem.


Check vibration protectionsystem.


L39VDIFF ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Vibration DifferentialTrouble


Vibration protectionsystem problem.


Check vibration protectionsystem.


L39VD1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Vibration Sensor DisabledÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Signal from vibrationsensor is faulty.


Check vibration sensors andwiring.


L39VFÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Vibration TransducerFault


Vibration detectorimpedance is not withinnormal bounds.


Check impedance of eachvibration detector.


L3WFD_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Flow FeedbackTrouble


A disagreement betweenthe water flow sensors hasbeen detected.


Determine failed sensor andreplace.


L86WN3ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Flow High LockoutÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water injection systemlocked out due toexcessive water flow.This is dangerous becauseit could extinguish flame.


Investigate water injectionsystem.


19


L3WFLT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Flow SensorTrouble


Water flow sensorsdisagree.


Recalibrate or replace faultyflow sensor.


L86WN1ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Inj SuctionPressure High Lockout


High supply pressure.ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check water supply system.


L86WN2 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Injection DischargePressure Low Lockout


Low supply pressure. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check water supply system.


L30WN ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Injection NotSelected


NOx control waterinjection systeminoperative.


Select Water Injection onOperator Interface.


L26JS2H_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Skid EnclosureTemperature High


Failure of exhaust fan. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check exhaust fan/motorcomponents for properoperation.


L26ALL_ALM ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Skid EnclosureTemperature Low


Failure of heaters. ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Check heater and blower forproper operation.


L86WN4 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water System TroubleLockout


Water injection systemnot ready for use.


Check water injection systemcomponents.


L3WSFLT_ALMÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Valve LVDTTrouble


Water valve LVDTsdisagree.


Recalibrate or replace faultyLVDT.


L30TWWÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Water Wash InhibitWheelspace Temp High


Turbine not sufficientlycooled before attemptingwater wash.


Allow turbine to cool tospecification prior toselection.


L30WSA1ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Wheelspace TempDifferential High


Excessive differentialbetween wheelspacethermocouples.


Check thermocouples forshorts, grounds or opens.Replace failures. If conditionpersists investigate for sealfailure.


L30WSA2 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Wheelspace TemperatureHigh


High wheelspace temperature. Check thermocouples,investigate for seal failure.

General Electric CompanyOne River Road, Schenectady, NY 12345518 • 385 • 2211 TX: 145354

GE Power Systems

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ALARM AND TROUBLE SHOOTING