gt 5~8 alarms

# Message Cause Action

1

Aux lube oil pump running

3.44 bar63 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-1254mm 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 QL432 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 barAC 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 QL0.41 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-118 °C

Lube oil tank temperature below recommended limitsStarting 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-174°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.

8Lube oil temperature switch trouble

Bad signal form Lube oil temperature switch

Check temperature switches 26 QT-1A, 1B and 26QA.

9Lube 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-1A63 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.

11 Lube oil header Lube oil header temp Check for proper operation of the

1

temp high trip26 QT-1A26 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-193 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-193 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 barTrip 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-1,2,31.38 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 EKA20CT005

10°C

Maximum temperature is 65°C and minimum is 15°C.

2

23

Dist. Pumps’ upstream pressure low

63 FD-10.5 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-1D0.2 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-22.41 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-3Alarm 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.

3

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.

44Liquid 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.

45Distillate 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.

47Feeding 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).

49Heavy 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

4

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 high71 GH EKA 20

CL 207560 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 CP202Alarm 18 Bar

59

Turbine air inlet high dropNGB 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 dropNGB 30 CP003

> 1800 PaGT normal S/D

High ΔP is detected at turbine air inlet

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

69Additive dosing panel off

Panel supply is off Check the power supply. The unit STOPS when this panel is OFF.

70Additive dosing panel trouble

Trouble on this panel Check proper operation of this panel. Check electrical circuit and instrumentation.

5

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.

90Cranking 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.

93Cool-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.

97Inlet guide vane position servo-trouble

Loss of feed back Check LVDT and logic circuit

98Inlet 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.

6

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-1alarm 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

7

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.

115Exhaust thermocouple trouble

Faulty thermocouple Check thermocouples and change if necessary

116

Exhaust temperature highTTDX 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 tripTT-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 tripTT-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 tripTT-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.

128Vibration sensor disabled

Signal from vibration sensors is faulty

Check sensors and wiring

129 High vibration High vibration at one Monitor vibration readings.

8

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.

132Vibration-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.

139Over-speed test mode selected

Over-speed trip being checked

140

Electrical over-speed trip77 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).

9

141

Over-speed bolt trip12 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.

142Off line diagnostics running

Off line diagnostic operation has been selected

Do not start unit until diagnostics are complete.

143

Loss of compressor discharge pressure bias96 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.

145Control 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 high26 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.

10

operation has been selected

151

Load compartment temperature high26 VG-2 316°C26 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.

160Battery 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

11

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°C9A, 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°CCO2 release at

315°C

Fire is detected in turbine, accessory, or load coupling area.


166Manual trip5EI-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.


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

12

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 G1,2,3Alarm 130°C

Tripping 140°CTripping 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. Appears after

Check the equipment causing the trouble. Determine and repair.

13

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


226

(T) communication link inoperative

Turbine panel communication between the (T) control microprocessor and the communication microprocessor has failed


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.

241Bearing 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 differential high

Excessive differential between wheel-space thermocouples

Check thermocouples for shorts, grounds or opens. Replace failures. Ir conditions persist, investigate for

14

83.3°C seal failure.

244

Wheel-space temperature high

High Wheel-space temperature.1st stage fwd (inner) 427°C1st stage fwd (outer) 482°C1st stage aft 510°C2nd stage fwd 510°C2nd stage aft 510°C3rd stage fwd 454°C3rd stage (aft) 427°CNote: +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



252

(T) high pressure set magnetic pickup fault



Gas fuel nozzle purge valve improperly close

Changeover to HSD and reset the indication.

Remote alarmsOn 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.

15

gt 5~8 alarms

Documents