# Message Cause Action 1
Aux lube oil pump running
3.44 bar 63 QA-1
Main pump is
supplying insufficient pressure due to pump failure or leaks.
Examine lube oil pump. Check it’s out put (6.89 bar) and filters for leaks or plugging. Check pressure switch 63 QA-1.
2
Lube oil level high
71 QH-1 254mm or 10”
High level of lube oil tank or some liquid is coming in the tank.
Check level switch 71 QH-1. Investigate cause of high level alarm and restore normal level.
NOTE: stop the unit if there is some other fluid with the lube oil (water or liquid fuel). In this case never start unit without repair.
3
Lube oil level low
71 QL 432 mm or 17”
Lube oil tank level low
Check level switch 71 QL-1. Check the system for possible leakage or for excessive consumption. NOTE:
in these units oil consumption is normal, so refilling is necessary periodically.
4
Lube oil pressure low
3.44 bar
AC pump cut in.
System leaks or pump or pressure switches trouble.
Repair leaks or pump. Check proper operation of pressure switch 63 QA-1 and check closing of test valves.
5 Emergency lube pump motor running 63 QL 0.41 bar
The main and ac lube oil pumps are
supplying insufficient pressure due to pump failure or leaks.
Check for leaks and pumps’ malfunction. Check proper operation of pressure switches 63 QL, 63 QT-2A, and 63 QT-2B.
6
Lube oil tank temperature low
26 QL-1 18 °C
Lube oil tank temperature below recommended limits
Starting is inhibited if header temperature is <18°C.
Check for proper operation of the Lube oil tank heaters. Check for proper operation of the temperature switch 26 QN-1.
7
Lube oil header temperature high
26 QA-1 74°C
Lube oil header temperature is above recommended limits.
Check Lube oil heat exchangers, CW fans (proper rotation) and temperature regulating valve VTR-1. Check temperature switch 26 QA-1.
8
Lube oil temperature switch trouble
Bad signal form Lube oil temperature switch
Check temperature switches 26 QT-1A, 1B and 26QA.
9
Lube oil
pressure switch trouble
Bad signal from Lube oil pressure switch
Check pressure switches 63 QT-2A, 2B and 63 QA.
10
Low Lube oil pressure trip
63 QT-1A 63 QT-2A 0.55bar
Pressure below the trip level. Pump 6.89
bar; bearing header 1.85 bar.
Determine cause and correct before restarting unit. Check pressure regulating v/v VPR.2.
temp high trip 26 QT-1A 26 QT-1B 80°C
above recommended
limits Lube oil Heat exchangers, CW fans (proper rotation) and temp regulating v/v VTR-1. Check temp switches 26 QT-1A and 26 QT-1B. 12
3 bearing temp High
371°C
Excessive temp at the load tunnel bearing 3
NOTE: this excessive temp gives a normal
stop order.
Check thermocouple TT-1B-1 if necessary. Look for reasons of this excessive temp.
14
Aux hydraulic oil pump motor running
63HQ-1 93 bar
Aux hydraulic oil pump is running after signal 14HS.
Check the hydraulic supply circuit (filters, regulating valve, vent and purge, leaks) or proper operation of the main hydraulic oil pump. Check circuit of the 88 HQ drawer.
15 Hydraulic supply pressure low 63HQ-1 93 bar Hydraulic supply pressure is low. Normal reading is 110 bar.
Check hydraulic supply pressure filter and differential pressure gauge, regulating v/v or, pump or proper operation of pressure switch 63 HQ-1. 16 Liquid fuel hydraulic trip pressure low 1.38 bar Trip the GT
Low oil pressure in liquid fuel hydraulic oil trip circuit. Normal value is 4.5 bar.
Check control oil filter and its piping. This alarm actuates if the turbine is tripped with the manual emergency trip valve on the turbine or a large leak were to occur in the hydraulic trip circuit piping.
17
Hydraulic protective trouble
One second after the hydraulic oil trip is initiated either the liquid fuel stop valve is not closed or the hydraulic trip pressure (63 HL-1, 2, 3) has not decreased sufficiently.
Check operation of 20 FL-1 servo valve. 18 Gas fuel hydraulic trip pressure low 63 FG-1,2,3 1.38 bar
Low oil pressure in gas fuel hydraulic oil trip circuit. Trip the GT 19 Liquid fuel hydraulic pressure switch trouble A low pressure is detected on the trip oil circuit or pressure switches’ trouble.
Check the ΔP on the trip oil filters. Transfer to the second filter and change if necessary as soon as possible. Check proper operation of temperature switches 63 HL-1, 2, 3. 21 Gas fuel temperature low trip 26 GL EKA20 CT005 10°C Maximum temperature is 65°C and minimum is 15°C.
23 Dist. Pumps’ upstream pressure low 63 FD-1 0.5 bar A distillate low pressure on the fuel oil supply is detected (forwarding skid). Normal value: 3.5bar
Check pressure switches 63FD-1, FD-2, and their proper operation and setting. Check the supply of the fuel pump motors and their drawers.
24
Heavy fuel filter Diff Press High (Upstream)
0.2 bar
The differential pressure on the heavy fuel filter is high
Check the ΔP switch. Change heavy fuel filter.
25
Dist fuel filter Diff Press High
(Upstream)
63 FL-1D 0.2 bar
The differential pressure is too high at fuel oil filter
Inspect fuel oil filters. Check of fuel oil filter differential pressure switch (operation and set point) 63 FL-1. Change or repair if necessary.
26 Liquid fuel pressure low 63 FL-2 2.41 bar (±0.14)
A low fuel oil supply pressure is detected ahead of the fuel oil stop valve.
GT trips with 5 sec delay.
Check fuel oil supply equipment i.e., filter and fuel oil pumps. Check pressure switch 63 FL-2 and the electronic circuit. Normal value is 6.3 bar. 27 Gas fuel pressure low 63 FG-3 Alarm 17.5 bar C/O to HSD Normal pressure is 25 bar. Tripping is at 13 bar. Setting of safety valve is 28 bar. 34 Heavy pumps upstream press. Low. Transfer to dist. 0.5 bar
A low pressure on the heavy fuel supply is detected.
Normal value: 3.5bar
Check pressure switches 63 FU-1, FU-2. Check the supply of the heavy fuel pump motor and their drawers. NOTE: Unit transfers automatically to distillate fuel oil. 35
Dist. Fuel skid trouble
Low distillate fuel pressure (6bar) pump or trouble with a forwarding pump at forwarding skid.
Check the fwd pump and its motor. Check the pipes, valves, filters, purges, vents, leaks. Check pressure switches 63 FD-1, 2 (operation and set point). 36 Heavy fuel transfer permissive trouble Trouble on the transfer operation
Check the heavy fuel transfer permissive logic
37
Heavy fuel press. Low auto transfer to dist.
< 4.5 bar at filtration skid.
63 FU-3
Heavy fuel pressure is low.
Normal value is 6.3 bar.
Search for the causes of low fuel pressure (fwd pump, filters, heavy fuel supply).
NOTE: if the unit is running with heavy fuel, the transfer to distillate is automatically initiated. 38 Heavy fuel temp. Low, Auto transfer to Dist. 92°C Heavy fuel
temperature is low Check the temperature switch and its proper operation and setting. Check the heavy fuel heating system. NOTE: the unit transfers automatically to distillate fuel oil.
39 A.A. Diff. pressure High Auto transfer to Dist. Atomizing air Δp is
high Check atomizing air system, the A.A. compressor and the pressure switch 63 AD. NOTE: if the unit is running with heavy liquid fuel, the transfer to distillate is automatically is initiated.
40
Liquid fuel temp. low
Distillate fuel temp is low on the fuel heating skid
Check the fuel temperature,
temperature switch and its set point. Check the proper operation of fuel heating system (heater, temperature switches, and electrical supply). 41 Auto Transfer to Dist. Communicator Failure © communicator link
failure Check the © communicator link. NOTE: with this trouble, the unit transfers automatically to distillate.
42
Liquid fuel control fault
Liquid fuel checking system has detected an abnormal servo or LVDT position or signal.
Determine abnormal condition by reading signal L3FLT1 to L3LFT3 on panel CRT display. 43 Start-up fuel flow excessive trip
Excessive fuel for start-up has been detected. For gas fuel the gas control valve is open too far.
Check the servo and feed back signals for proper operation. With liquid fuel: check tripping set point and fuel loop system operation. With gas fuel : check setting value of L.V.D.T. when valve is closed and the calibration of the V.S.R. 44
Liquid fuel stop valve failure to open
Fuel oil stop valve takes a long time to open
Check proper operation of stop valve and of the trip oil circuit. 45
Distillate fuel filter diff pressure high
Differential pressure is too high fuel oil filter
Inspect the filters. Check Δp switch (operation and set point).
46 Heavy fuel filter diff pressure high (downstream) Δp is too high at heavy FO filter
Inspect the filter. Check the Δp switch.
47
Feeding pipe purge running
Feeding pipe purge is not in correct
condition
Check the limit switch. Check the correct position.
48
Heavy fuel temp high
Heavy fuel temp is high on fuel heating skid
Check fuel temp. Check temp switch. Check proper operation of fuel heating system (heater, temperature switches). 49 Heavy skid trouble
Low heavy pressure supply
Check heavy forwarding system (pumps, filters, and pressure switches).
50 Turbine cooling water system trouble
Trouble on the turbine
CW system Check the turbine CW system: proper operation of water pump, pressure switches, leaks). Check the
water level in the tank. 51 Generator cooling water system trouble < 3 bar standby
pump cuts in.
Trouble in the generator CW system
Check the generator CW system: proper operation of water pump, pressure switches, leaks). Check the water level in the tank.
52 Cooling fan motor breaker open Breaker opened by operator or tripped by high motor temperature
Correct cause of problem and close
52 Gas scrubber condensate level high 71 GH EKA 20 CL 207 560 mm C/O to HSD 53 Gas scrubber condensate level very high
71 GHH EKA 20 CL 208
740 mm S/D. 54
Sump tank high level
Sump level is too high Check level. Check the sump pump 88 WP and its power and control supply. Check level indicator 71 WP. Empty the sump tank with the pump as soon as possible.
56
Gas fuel supply pressure low
63 FG-1 EKA20 CP202 Alarm 18 Bar
59
Turbine air inlet high drop
NGB 30 CP002 > 1300 Pa
High ΔP is detected at turbine air inlet. Normal ΔP is 180 to 600 Pa. at 700 Pa cleaning cycle starts, and 500 Pa cleaning is stopped.
Check for proper operation of air inlet system (filters, sequences, compressed air system).
60
Turbine air inlet excessive drop
NGB 30 CP003 > 1800 Pa GT normal S/D
High ΔP is detected at
turbine air inlet Check for proper operation of air inlet system (filters, sequences, compressed air system).
69 Additive dosing panel off Panel supply is off Check the power supply. The unit STOPS when this panel is OFF. 70
Additive dosing panel trouble
Trouble on this panel Check proper operation of this panel. Check electrical circuit and instrumentation.
71
No additive flow, transfer to distillate or shutdown
The additive system is
in trouble Check for the cause of this trouble and repair.
86
Starting device trip
Failure of cranking motor to start
Check the cranking motor cell, the breaker and the electrical motor. Identify the faulty circuit and repair. Caution: take the safety
recommendation for working on medium voltage. 87 Normal-Emergency supply changeover trip
Trouble on the normal emergency supply changeover
Check the change over system (breakers, electrical circuit) and the power plant electrical supply.
88 Normal shutdown protective lockout Electrical trouble on the generator with normal shutdown for unit
Determine the electrical trouble with the matrix in the protection panel. The unit should not be operated until the cause of the problem has been determined and corrected.
90 Cranking motor temp high Over-temperature on the cranking motor Search and determine the cause of this over temperature. Check the temperature switch.
91
Starting motor protective lockout
The cranking motor protective system has been initiated
Determine the cause of this fault before attempting a new start. Note:
the master reset switch must be pressed before restarting.
92
Torque
converter drain valve trouble
The torque converter drain valve is not actuated in the same time the solenoid valve (20 TU-1)
Check the proper operation of drain valve and solenoid valve/ check the limit switch. 93 Cool-down trouble Turning gear sequence is stopped
Check the AC power supply on the unit. Check the turning gear motor drawer.
94
Turbine shaft does not break away
Unit can not break away or reach its nominal speed
Check the starting sequence. Check the starting means system. Research why the turbine can not reach its nominal speed.
95
Turning gear
motor trouble The turning gear motor is not running during the turning gear sequence
Check the motor drawer 88 TG (fuses, breaker, relaying, power supply). Check the AC power supply.
97
Inlet guide vane position servo-trouble
Loss of feed back Check LVDT and logic circuit
98
Inlet guide vane control trouble-alarm
IGV position is nor correct
Check the IGV control. 100 Inlet guide vane IGV position is not Check the IGV control.
control trouble trip correct 102 Compressor bleed valve position trouble Compressor bleed valves have not operated properly. They are in wrong position or required an excessive amount of time to move from one position to another.
Investigate problem. The problem should be corrected before
restarting. The master reset switch must be pressed before restarting. Check proper operation of solenoid valve 20 CB: check control air supply of VA 2-1, 2-2, 2-3, 2-4 valves and opening of isolating valve, and cleanliness of air separator. 104 Atomizing air diff pressure low Auto transfer to distillate 63 AD-1 < 1.03 bar Compressor is not supplying adequate pressure
Check atomizing air system and closure of vent valve at outlet of main atomizing air compressor. Check on turning gear if the shaft driven AA compressor is running; if coupling is broken replace the compressor before starting the unit. Check for any vibration of
compressor. Check pressure switch 63 AD-1 and its set point
105 Atomizing air temp high 26 AA-1 alarm 105°C 135°C GT normal S/D Temperature high at the AA compressor input.
Check water supply to AA pre-cooler, isolating valve position for flow restrictions. Check proper operation of thermostatic valve VTR-2 and temperature switch 26 AA-1. 109 Chamber flamed out during shutdown
Chamber flamed out during shutdown
Check the fuel supply and the fuel control. Check fuel nozzles.
110 Loss of flame trip No signal from three flame detectors. Failure of flame detectors of loss of flame
Check for the following: fuel being supplied to combustors, flame in all chambers, damaged crossfire tubes, or combustors. Check for proper control valve position and fuel pressure. Check for proper
operation of the flame detectors 28 FD-3, 4, 5, 11.
111
Failure to ignite Failure to fire within one minute period
Check AC power is supplied to ignition system. Check fuel supply. Check if isolating valves on flame detectors are open. Check proper operation of spark plugs and flame detectors.
112 Combustion trouble
Faulty thermocouples, gas path hardware or uneven distribution of fuel to fuel nozzles
Analyze data for trends. At the earliest shutdown to check
thermocouples. Perform bore-scope or combustion. Check flow divider
fuel pressure. Check for plugged nozzles.
113
Flame detector
trouble One of the detectors operating when no flame is present or flame detection before the firing sequence.
Check for proper operation of flame detection system. Check that flame detectors quartz windows are clean. Repair or replace if necessary.
114 Compressor inlet thermocouples disagree Bad thermocouple signal. Thermocouple Δt > 52.8°C.
Check the wiring of thermocouples.
115
Exhaust thermocouple trouble
Faulty thermocouple Check thermocouples and change if necessary 116 Exhaust temperature high TTDX 1 to 24 > TTRX + 15°C
Exhaust gas temp is excessive. TTRX is temperature control reference.
Check all thermocouples. If they are normal, isolate portion of control system causing problem. Check temp control loop and fuel control system.
117
Exhaust frame cooling air pressure low
Exhaust frame blower motor is nor
operating. Air passage is blocked
Check motor operation. Inspect cooling air flow passages. Check pressure switches 63 TK-1, 2.
119
High exhaust temp spread trip
TT-DX-1 to 24 > TTXSPL. Two adjacent thermocouples Δt >69°C Faulty thermocouples, gas path parts or uneven distribution of fuel to the nozzles.
Analyze data for trends. Perform bore-scope or combustion
inspection. Check flow divider, fuel pressures. Check for plugged nozzles. 120 Exhaust over-temperature trip TT-DX-1 to 24 =TTRX +22°C OR > 615°C.
Temp control system has not limited exhaust temp within trip limits.
Check temp control loop and fuel control system. 121 Exhaust thermocouple open trip TT-DX-1 to 24 average exhaust temperature < 121 °C after 50% speed. Excessive number of thermocouples not connected
Check and reconnect thermocouples. Check the combustion in chambers.
123
Exhaust base plenum cooling air trouble
Exhaust base plenum cooling air pressure is too low when the breaker is closed.
Check motor 88 TK-1 or 88 TK-2. Check cooling air flow passages. Check proper operation of pressure switches 63 TK-1, 63 TK-2.
128 Vibration sensor disabled
Signal from vibration sensors is faulty
Check sensors and wiring 129 High vibration High vibration at one Monitor vibration readings.
alarm
> 12.5 mm/sec or more bearings Determine cause of this trouble and repair.
130
Vibration
transducer fault Vibration detector impedance is not within normal bounds or 3 or more gas turbine sensors are disabled or faulty.
Check impedance of each vibration detector (open or short circuit). Check vibration protection system.
Note: within the 3 or more sensors disabled or faulty, the start is inhibited. 131 Vibration differential trouble Vibration protection
system problem Check vibration protection system. Check level of each sensor and determine cause of differential. Check the logic.
132 Vibration-start inhibit
Vibration protection system problem
Check Vibration protection system problem. 133 High vibration trip or shut down > 25 mm/sec
High vibration due to bowed rotor,
mechanical
imbalance, bearing failure, etc.
Check hydraulic ratchet is operating properly. Check for mechanical failures; observe vibration level on next start-up.
136
Turbine
under-speed Speed is too low at the end of starting sequence
Reduce the load that will be applied to the generator before re-closing generator breaker. (Network problems). Check proper operation of 14 HS circuit logic. 137 Turbine incomplete sequence Failure of unit to reach complete sequence
Check equipment which is causing problem in the normal sequence: starting means power, torque converter, fuel control, acceleration loop. Check if AUTO order had been executed.
138
Failure to start Master protective logic signal “L4” has not been set within 30 seconds of start signal, has tripped the unit twice or if the unit is operating in remote, flame was not established after two tries at establishing flame.
Check all the signals going making up the L4 logic signal to determine which caused the problem or determine cause of lack of flame establishment.
139 Over-speed test mode selected
Over-speed trip being checked 140 Electrical over-speed trip 77 NH-1,2,3 >3300 rpm
Speed control system has not limited turbine speed within the trip limits or the turbine trips during the electrical over-speed test
Determine and repair before
restarting (mechanical, electrical or fuel or speed control trouble).
141
Over-speed bolt trip
12 HA >3375 rpm ± 50
Trip circuit has been tripped by mechanical over-speed action
Check electrical over-speed system. Check proper operation and setting of over-speed bolt assembly. Repair before starting and reset manually the mechanical over-speed limit switch on the over-speed bolt. 142
Off line diagnostics running
Off line diagnostic operation has been selected
Do not start unit until diagnostics are complete. 143 Loss of compressor discharge pressure bias 96 CD-1 < 4.83 bar at full speed
Bad signal from compressor discharge pressure transmitter.
Check transmitter and associated connections for proper bias signal.
144
FSR gag not at maximum limit
Manual FSR control has not been reset to a position where it will not interfere with automatic FSR control
Raise the manual FSR control to maximum.
145 Control panel temp high Air conditioners are not maintaining proper temperature.
Check the ACs. Clean their filters if dirty. Note: the control
compartment doors must be closed.
146 Turbine compartment temp high 26 BT-1 120°C Compartment temp excessive
Check cooling air fan for proper operation. Check for hot air leaks. Check temp switch 26 BT-1. Note:
an excessive turbine compartment temp can trip the fire protection.
147
Master
protective start-up lockout
Within the turbine control panel the three microprocessor
control sections R, S, and T are in
disagreement for the proper condition of the Master Protective Logic “4X”.
Determine which controller is in disagreement with the other two ones. Check which conditions are not correct to authorize the start-up?
148
Control system
self check trip Microprocessor self checking program has uncovered a control panel problem. Communication amongst communicator and controllers R, S ,and T has failed or a HCMA card has failed
Investigate problem. Check section running lights on auxiliary display. Check HCMA card status “OK” lights. 149 Maintenance-forcing mode enabled Auto calibrate, memory changing or logic forcing mode of
When done with the operation, deselect the operation.
operation has been selected 151 Load compartment temperature high 26 VG-2 316°C 26 VG-1 205°C A high temp is detected in the load gear compartment
Check the proper operation of fan motor 88 VG. Check the opening of load gear compartment dampers.
153
Damper system alarm
Indicates that BYD closed and BID opened. Mismatch or fault on BYD or BID. 155
MCC under-voltage
MCC panel is not supplied
Check the breaker and its fuses.
Note: with this alarm, no permissive to close the generator breaker 52 G or opening when this alarm occurs.
156
Auxiliary motor overload
One of the auxiliary motors is overload
Check auxiliary motors to determine which motor is overloaded and the cause of overloading. On the
defective motor, check the overload relay, the fuses (or the CB), the motor with the cables. Check set point of the overload relay. Check fuses FU 1, 2 on the motor overload circuit. 158 DC motor under-voltage DC power not supplied to emergency dc Lube Oil Pump
Check power to dc lube pump (MCC breaker on). Check the fuses and the relay 27 QE. Note: gas
turbine should not be operated unless dc power is available to emergency dc Lube Oil Pump.
160 Battery charger AC under-voltage Battery charger AC under-voltage
Check its AC breaker and voltage magnitude.
161
Battery DC under-voltage
Battery system
voltage is low. Battery charger is not
functioning properly, excessive drain on the batteries, or bad cells in battery.
Check battery charger for proper operation, correct excessive drain o battery. Check for bad cells. Check battery charger fuses. Note: gas turbine should not be operated unless dc power is available to the emergency dc Lube Oil Pump. 162 Battery 125 V
dc ground
Insulation failure has resulted in a ground on the 125 Vdc system
Immediate action should be taken to locate ground and to repair, because if a second ground occurs, this can result in severe damage to the wiring and the battery. As soon as possible, shut down the unit and check the 125Vdc power. Isolate the ground and remove system. Check
dc motors and all circuits supplied with dc voltage. Caution: during
this search, the generator breaker and electrical engine breaker must be opened for safety.
164 Fire ( load tunnel) 45FT 8A,8B,9A,9B 8A, 8B 510°C 9A, 9B 315°C A fire is detected in
the load tunnel area. Check if there is really a fire? If it is, check if the fire protection is actuated and the doors and dampers are closed. If no fire, determine the real cause; fire detector or over-temperature. Note: the unit should
not be operated until the problem has been corrected and the fire protection has been re-established in its normal condition.
165 Fire (Turbine, Accessory compartment Alarm 120°C CO2 release at 315°C Fire is detected in turbine, accessory, or load coupling area.
Check if there is really a fire? If it is, check if the fire protection is actuated and the doors and dampers are closed. If no fire, determine the real cause; fire detector or over-temperature. Note: the unit should
not be operated until the problem has been corrected and the fire protection has been re-established in its normal condition.
166
Manual trip 5EI-PB in LCR
Emergency stop pushbutton has been pressed
Correct abnormality that caused operator to push the emergency stop pushbutton. 167 Fire (Generator) 45 FG-1,2 Fire is detected in generator area.
Check if there is really a fire? If it is, check if the fire protection is actuated and the doors and dampers are closed. If no fire, determine the real cause; fire detector or over-temperature. Note: the unit should
not be operated until the problem has been corrected and the fire protection has been re-established in its normal condition.
168
Customer equipment trip (If used)
Customer trips input to the L4CT logic have caused an automatic trip of the unit
Determine which of the customer trip devices caused the trip and correct. 169 Customer equipment start inhibit ( If used) Customer equipment inhibits the starting procedure
Determine which of the customer equipment inhibit the start.
170 Bus under-voltage-no auto synch
Bus synchronizing
potential not available Check bus PT fuses and wiring. Do not use auto synchronizing or manual synchronizing until problem
is resolved. Check relays 27 B-1, 2. 171 Auto synchronizing lockout Auto synchronizing self checking system has detected a synch equipment
abnormality.
Investigate synchronizing system to determine exact cause of problem.
172
Failure to synchronize
Unit did not
synchronize and close generator breaker within the normal expected time.
Investigate synchronizing system to determine exact cause of problem. Check the stability of the turbine speed control. 173 Generator stator temperature high 49 G1,2,3 Alarm 130°C Tripping 140°C Tripping of generator and normal shut down of GT. Generator stator temperature is excessive caused by lack of cooling or overload
The generator should not be operated when the stator temp is excessive. Check cooling system, reduce overload on generator. Check proper operation of temp detector system and its alarm set point. Check the thermocouple circuit and the ac power of this equipment.
174
Generator differential trip
Electrical trouble with emergency shutdown. Relay 86 E indicates a generator differential
The unit should not be operated until the cause of the problem has been determined and corrected.
175
Generator breaker tripped
Generator breaker has been tripped by an automatic protective device or manually
Determine device that tripped the breaker. The problem should be corrected before re-coupling. Note:
for a new coupling, one must give a new start order for proper
operation of synchronizing sequence. 176 Generator electrical fault Electrical troubles on generator control or/and o protection panel.
Determine the electrical trouble with the matrix in the protection panel and in generator control panel (ATG-02). Check the power supply breaker. For checks seethe
indicating lights in front of ATG 02 panel for these alarms.
177
Transformer
fault Trouble on the transformer. Appears after tripping / isolating of GT.
Check the equipment causing the trouble. For the search, look at the indicating lights LED on the matrix (protection panel) and main
transformer schematic diagrams.
Note: the trouble must be reset on the matrix with the reset
pushbutton.
178 Fault from 220 KV switchyard
There is a fault on 220KV switchyard.
Check the equipment causing the trouble. Determine and repair.
Appears after tripping / isolating of GT. 224 ® communicator link inoperative Turbine panel communication between the ® control microprocessor and the communication microprocessor has failed
Check the power supply. Replace faulty component. 225 (S) communication link inoperative Turbine panel communication between the (S) control microprocessor and the communication microprocessor has failed
Check the power supply. Replace faulty component. 226 (T) communication link inoperative Turbine panel communication between the (T) control microprocessor and the communication microprocessor has failed
Check the power supply. Replace faulty component.
229
Fire detector
system trouble Fire detector problem Check the fire detectors and the electrical circuit. This trouble must be corrected as soon as possible.
Note: before this search, the fire protection must be inhibited. Don’t forget to put again in service as soon as the maintenance is finished.
230
Water wash inhibit- wheel-space temp high
>149°C
The washing
procedure is inhibited because wheel-space temp is too high
Check temp and wait for an adequate wheel-space temp.
232
Diagnostic alarm. See display
The microprocessor self checking program has uncovered a control problem
Call up diagnostic display.
234
Primary EEPROM changed, not backed up
Operator has changed a EEPROM, but this EEPROM is not backed up
Restore normal conditions.
241
Bearing drain temp high
100°C
Bearing or lube oil problem
Check bearings and lube oil system. Check thermocouples and lube oil cooling system.
243 Wheel-space temp
Excessive differential between wheel-space
Check thermocouples for shorts, grounds or opens. Replace failures.
differential high
83.3°C thermocouples Ir conditions persist, investigate for seal failure.
244 Wheel-space temperature high High Wheel-space temperature. 1st stage fwd (inner) 427°C 1st stage fwd (outer) 482°C 1st stage aft 510°C 2nd stage fwd 510°C 2nd stage aft 510°C 3rd stage fwd 454°C 3rd stage (aft) 427°C
Note: +39°C for 1st 1 hour.
Check thermocouples, investigate for seal failure.
250 ® high pressure set magnetic pickup fault A speed magnetic pickup is faulty
Check the magnetic pickup and its signal. Check logic circuit.
251 (S) high pressure set magnetic pickup fault A speed magnetic pickup is faulty
Check the magnetic pickup and its signal. Check logic circuit.
252 (T) high pressure set magnetic pickup fault A speed magnetic
pickup is faulty Check the magnetic pickup and its signal. Check logic circuit. Gas fuel nozzle
purge valve improperly close
Changeover to HSD and reset the indication.
Remote alarms
On the remote desk, there are many alarms that regroup the main alarms on the alarm display of the turbine control panel. These alarm indicating lights are:
• GT control system failure
• Starting sequences failure
• Auxiliary system failure
• MCC trouble
• Fuel trouble
• Lube oil or turning gear trouble
• Turbine shaft trouble or trip
• Flame detecting trouble or trip
• Exhaust temperature trouble or trip
When an alarm appears on the remoter control desk, one must go in the turbine control compartment for looking the veritable alarm message on the CRT.
