GT 5~8 Alarms

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Message Aux lube oil pump running 3.44 bar 63 QA-1 Lube oil level high 71 QH-1 254mm or 10”

Cause Main pump is supplying insufficient pressure due to pump failure or leaks. High level of lube oil tank or some liquid is coming in the tank.

Lube oil level Lube oil tank level low low 71 QL 432 mm or 17” Lube oil pressure low 3.44 bar AC pump cut in. Emergency lube pump motor running 63 QL 0.41 bar Lube oil tank temperature low 26 QL-1 18 °C Lube oil header temperature high 26 QA-1 74°C Lube oil temperature switch trouble Lube oil pressure switch trouble Low Lube oil pressure trip 63 QT-1A 63 QT-2A 0.55bar Lube oil header

System leaks or pump or pressure switches trouble. The main and ac lube oil pumps are supplying insufficient pressure due to pump failure or leaks. Lube oil tank temperature below recommended limits Starting is inhibited if header temperature is 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. Turbine air inlet High ΔP is detected at excessive drop turbine air inlet NGB 30 CP003 > 1800 Pa GT normal S/D Additive dosing Panel supply is off panel off Additive dosing Trouble on this panel panel trouble

water level in the tank. Check the generator CW system: proper operation of water pump, pressure switches, leaks). Check the water level in the tank. Correct cause of problem and close

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.

Check for proper operation of air inlet system (filters, sequences, compressed air system).

Check for proper operation of air inlet system (filters, sequences, compressed air system). Check the power supply. The unit STOPS when this panel is OFF. Check proper operation of this panel. Check electrical circuit and instrumentation.

6 No additive flow, transfer to distillate or shutdown Starting device trip

The additive system is in trouble

Check for the cause of this trouble and repair.

Failure of cranking motor to start

NormalEmergency supply changeover trip Normal shutdown protective lockout

Trouble on the normal emergency supply changeover

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. Check the change over system (breakers, electrical circuit) and the power plant electrical supply.

Cranking motor temp high

Over-temperature on the cranking motor

Starting motor protective lockout

The cranking motor protective system has been initiated

92

Torque converter drain valve trouble

93

Cool-down trouble

The torque converter drain valve is not actuated in the same time the solenoid valve (20 TU-1) Turning gear sequence is stopped

Turbine shaft does not break away

Unit can not break away or reach its nominal speed

71

86

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88

90

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94

Turning gear motor trouble

Electrical trouble on the generator with normal shutdown for unit

The turning gear motor is not running 95 during the turning gear sequence Inlet guide vane Loss of feed back 97 position servotrouble Inlet guide vane IGV position is nor 98 control trouble- correct alarm 100 Inlet guide vane IGV position is not

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. Search and determine the cause of this over temperature. Check the temperature switch. Determine the cause of this fault before attempting a new start. Note: the master reset switch must be pressed before restarting. Check the proper operation of drain valve and solenoid valve/ check the limit switch. Check the AC power supply on the unit. Check the turning gear motor drawer. Check the starting sequence. Check the starting means system. Research why the turbine can not reach its nominal speed. Check the motor drawer 88 TG (fuses, breaker, relaying, power supply). Check the AC power supply. Check LVDT and logic circuit Check the IGV control. Check the IGV control.

7 control trouble trip Compressor bleed valve position trouble 102

Atomizing air diff pressure low Auto transfer to 104 distillate

correct 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. Compressor is not supplying adequate pressure

63 AD-1 < 1.03 bar

Atomizing air temp high 26 AA-1 105 alarm 105°C 135°C GT normal S/D Chamber flamed out 109 during shutdown Loss of flame trip No signal from three flame 110 detectors.

Temperature high at the AA compressor input.

Failure to ignite

Failure to fire within one minute period

Chamber flamed out during shutdown Failure of flame detectors of loss of flame

111

112 Combustion trouble

Faulty thermocouples, gas path hardware or uneven distribution of fuel to fuel nozzles

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. 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 Check water supply to AA precooler, isolating valve position for flow restrictions. Check proper operation of thermostatic valve VTR-2 and temperature switch 26 AA-1. Check the fuel supply and the fuel control. Check fuel nozzles. 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. 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. Analyze data for trends. At the earliest shutdown to check thermocouples. Perform bore-scope or combustion. Check flow divider

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Flame detector trouble 113

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123 128 129

Compressor inlet thermocouples disagree Exhaust thermocouple trouble Exhaust temperature high TTDX 1 to 24 > TTRX + 15°C Exhaust frame cooling air pressure low

One of the detectors operating when no flame is present or flame detection before the firing sequence. Bad thermocouple signal. Thermocouple Δt > 52.8°C.

fuel pressure. Check for plugged nozzles. Check for proper operation of flame detection system. Check that flame detectors quartz windows are clean. Repair or replace if necessary. Check the wiring of thermocouples.

Faulty thermocouple

Check thermocouples and change if necessary

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. Check motor operation. Inspect cooling air flow passages. Check pressure switches 63 TK-1, 2.

Exhaust frame blower motor is nor operating. Air passage is blocked High exhaust Faulty thermocouples, temp spread trip gas path parts or TT-DX-1 to 24 uneven distribution of > TTXSPL. fuel to the nozzles. Two adjacent thermocouples Δt >69°C Exhaust overTemp control system temperature trip has not limited TT-DX-1 to 24 exhaust temp within =TTRX +22°C trip limits. OR > 615°C. Exhaust Excessive number of thermocouple thermocouples not open trip connected TT-DX-1 to 24 average exhaust temperature < 121 °C after 50% speed. Exhaust base Exhaust base plenum plenum cooling cooling air pressure is air trouble too low when the breaker is closed. Vibration Signal from vibration sensor disabled sensors is faulty High vibration High vibration at one

Analyze data for trends. Perform bore-scope or combustion inspection. Check flow divider, fuel pressures. Check for plugged nozzles. Check temp control loop and fuel control system.

Check and reconnect thermocouples. Check the combustion in chambers.

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. Check sensors and wiring Monitor vibration readings.

9 alarm or more bearings > 12.5 mm/sec Vibration Vibration detector transducer fault impedance is not within normal bounds 130 or 3 or more gas turbine sensors are disabled or faulty. Vibration Vibration protection differential system problem 131 trouble Vibration-start inhibit High vibration trip or shut 133 down > 25 mm/sec 132

Turbine underspeed 136

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Turbine incomplete sequence

Failure to start

138

Over-speed test mode selected Electrical overspeed trip 77 NH-1,2,3 140 >3300 rpm 139

Determine cause of this trouble and repair. 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. Check vibration protection system. Check level of each sensor and determine cause of differential. Check the logic. Check Vibration protection system problem. Check hydraulic ratchet is operating properly. Check for mechanical failures; observe vibration level on next start-up.

Vibration protection system problem High vibration due to bowed rotor, mechanical imbalance, bearing failure, etc. Speed is too low at the Reduce the load that will be applied end of starting to the generator before re-closing sequence generator breaker. (Network problems). Check proper operation of 14 HS circuit logic. Failure of unit to Check equipment which is causing reach complete problem in the normal sequence: sequence starting means power, torque converter, fuel control, acceleration loop. Check if AUTO order had been executed. Master protective Check all the signals going making logic signal “L4” has up the L4 logic signal to determine not been set within 30 which caused the problem or seconds of start determine cause of lack of flame signal, has tripped the establishment. unit twice or if the unit is operating in remote, flame was not established after two tries at establishing flame. Over-speed trip being checked Speed control system Determine and repair before has not limited turbine restarting (mechanical, electrical or speed within the trip fuel or speed control trouble). limits or the turbine trips during the electrical over-speed test

10 Over-speed bolt trip 12 HA >3375 141 rpm ± 50

Trip circuit has been tripped by mechanical over-speed action

Off line 142 diagnostics running Loss of compressor discharge 143 pressure bias 96 CD-1 < 4.83 bar at full speed FSR gag not at maximum limit 144

Off line diagnostic operation has been selected Bad signal from compressor discharge pressure transmitter.

Control panel 145 temp high Turbine compartment 146 temp high 26 BT-1 120°C Master protective startup lockout 147

Control system self check trip

148

149 Maintenanceforcing mode enabled

Manual FSR control has not been reset to a position where it will not interfere with automatic FSR control Air conditioners are not maintaining proper temperature. Compartment temp excessive

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”. 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 Auto calibrate, memory changing or logic forcing mode of

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. Do not start unit until diagnostics are complete. Check transmitter and associated connections for proper bias signal.

Raise the manual FSR control to maximum.

Check the ACs. Clean their filters if dirty. Note: the control compartment doors must be closed. 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. Determine which controller is in disagreement with the other two ones. Check which conditions are not correct to authorize the start-up?

Investigate problem. Check section running lights on auxiliary display. Check HCMA card status “OK” lights.

When done with the operation, deselect the operation.

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Load compartment temperature 151 high 26 VG-2 316°C 26 VG-1 205°C

153

Damper system alarm MCC undervoltage

operation has been selected A high temp is detected in the load gear compartment

Indicates that BYD closed and BID opened. Mismatch or fault on BYD or BID. MCC panel is not supplied

Check the proper operation of fan motor 88 VG. Check the opening of load gear compartment dampers.

Check the breaker and its fuses. Note: with this alarm, no permissive 155 to close the generator breaker 52 G or opening when this alarm occurs. Auxiliary motor One of the auxiliary Check auxiliary motors to determine overload motors is overload which motor is overloaded and the cause of overloading. On the defective motor, check the overload relay, the fuses (or the CB), the 156 motor with the cables. Check set point of the overload relay. Check fuses FU 1, 2 on the motor overload circuit. DC motor DC power not Check power to dc lube pump under-voltage supplied to emergency (MCC breaker on). Check the fuses dc Lube Oil Pump and the relay 27 QE. Note: gas 158 turbine should not be operated unless dc power is available to emergency dc Lube Oil Pump. Battery charger Battery charger AC Check its AC breaker and voltage under-voltage magnitude. 160 AC undervoltage Battery DC Battery system Check battery charger for proper under-voltage voltage is low. Battery operation, correct excessive drain o charger is not battery. Check for bad cells. Check functioning properly, battery charger fuses. Note: gas 161 excessive drain on the turbine should not be operated batteries, or bad cells unless dc power is available to the in battery. emergency dc Lube Oil Pump. Insulation failure has Immediate action should be taken to 162 Battery 125 V dc ground resulted in a ground locate ground and to repair, because on the 125 Vdc system 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

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Fire ( load tunnel)

A fire is detected in the load tunnel area.

45FT 8A,8B,9A,9B

164

8A, 8B 510°C 9A, 9B 315°C

Fire (Turbine, Fire is detected in Accessory turbine, accessory, or compartment load coupling area. Alarm 120°C CO2 release at 165 315°C

Manual trip Emergency stop 166 5EI-PB in LCR pushbutton has been pressed Fire Fire is detected in (Generator) generator area. 45 FG-1,2 167

Customer equipment trip 168 (If used) Customer equipment start 169 inhibit ( If used) 170 Bus undervoltage-no auto synch

Customer trips input to the L4CT logic have caused an automatic trip of the unit Customer equipment inhibits the starting procedure Bus synchronizing potential not available

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. 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 overtemperature. 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. 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 overtemperature. 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. Correct abnormality that caused operator to push the emergency stop pushbutton. 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 overtemperature. 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. Determine which of the customer trip devices caused the trip and correct. Determine which of the customer equipment inhibit the start. Check bus PT fuses and wiring. Do not use auto synchronizing or manual synchronizing until problem

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Auto synchronizing 171 lockout

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Auto synchronizing self checking system has detected a synch equipment abnormality. Failure to Unit did not synchronize synchronize and close generator breaker within the normal expected time. Generator stator Generator stator temperature temperature is high excessive caused by 49 G1,2,3 lack of cooling or Alarm 130°C overload Tripping 140°C Tripping of generator and normal shut down of GT. Generator Electrical trouble with differential trip emergency shutdown. Relay 86 E indicates a generator differential Generator Generator breaker has breaker tripped been tripped by an automatic protective device or manually

Generator electrical fault

Electrical troubles on generator control or/and o protection panel.

Transformer fault

Trouble on the transformer. Appears after tripping / isolating of GT.

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177

178 Fault from 220 KV switchyard

There is a fault on 220KV switchyard.

is resolved. Check relays 27 B-1, 2. Investigate synchronizing system to determine exact cause of problem.

Investigate synchronizing system to determine exact cause of problem. Check the stability of the turbine speed control. 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. The unit should not be operated until the cause of the problem has been determined and corrected. 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. 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. 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. Check the equipment causing the trouble. Determine and repair.

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® communicator link inoperative 224

(S) communication link inoperative 225

(T) communication link inoperative 226

Fire detector system trouble

Appears after tripping / isolating of GT. Turbine panel communication between the ® control microprocessor and the communication microprocessor has failed Turbine panel communication between the (S) control microprocessor and the communication microprocessor has failed Turbine panel communication between the (T) control microprocessor and the communication microprocessor has failed Fire detector problem

229

Water wash inhibit- wheel230 space temp high >149°C Diagnostic alarm. See 232 display

The washing procedure is inhibited because wheel-space temp is too high The microprocessor self checking program has uncovered a control problem Operator has changed a EEPROM, but this EEPROM is not backed up Bearing or lube oil problem

Primary EEPROM 234 changed, not backed up Bearing drain 241 temp high 100°C Excessive differential 243 Wheel-space temp between wheel-space

Check the power supply. Replace faulty component.

Check the power supply. Replace faulty component.

Check the power supply. Replace faulty component.

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. Check temp and wait for an adequate wheel-space temp. Call up diagnostic display.

Restore normal conditions.

Check bearings and lube oil system. Check thermocouples and lube oil cooling system. Check thermocouples for shorts, grounds or opens. Replace failures.

15 differential high 83.3°C Wheel-space temperature high

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® high pressure 250 set magnetic pickup fault (S) high pressure set 251 magnetic pickup fault (T) high pressure set 252 magnetic pickup fault Gas fuel nozzle purge valve improperly close

thermocouples High Wheel-space temperature.

Ir conditions persist, investigate for seal failure. Check thermocouples, investigate for seal failure.

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.

A speed magnetic pickup is faulty

Check the magnetic pickup and its signal. Check logic circuit.

A speed magnetic pickup is faulty

Check the magnetic pickup and its signal. Check logic circuit.

A speed magnetic pickup is faulty

Check the magnetic pickup and its signal. Check logic circuit. 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.