GE SPEEDTRONIC Mark V Troubleshooting Chart page 8

Alarm 1
156 L86TXT
157 L86TFB
158 L30SPTA
159 L30SPA
160 L30SPT
161 L39VD3_ALM
162 L39VTX_ALM
163 L39VD1
164 L39VF
165 L39VA
166 L39VDIFF
167 L3GRVFLT
168 L3GCVFLT
169 L3GFIVP
170 L63FGL_ALM
8
SPEEDTRONIC Mark V Annunciator Troubleshooting Chart
Exhaust Overtemperature The temperature control
Trip system has not limited ex-
haust temperature within
the trip limits.
Exhaust Thermocouples Excessive number of ther-
Open Trip mocouples not connected.
Exhaust Thermocouple Faulty thermocouple.
Trouble
Combustion Trouble Faulty thermocouples, gas
path hardware or uneven
distribution of fuel to the
fuel nozzles.
High Exhaust Temp. Faulty thermocouples, gas
Spread Trip path parts or uneven dis-
tribution of fuel to the fuel
nozzles.
Vibration – Start Inhibit Vibration protection sys-
tem problem.
High Vibration Trip or High vibration due to
Shutdown bowed rotor, mechanical
imbalance, bearing failure,
etc.
Vibration Sensor Disabled Signal from vibration sen-
sor is faulty.
Vibration Transducer Fault Vibration detector imped-
ance is not within normal
bounds.
High Vibration Alarm High vibration at one or
more bearings.
Vibration Differential Vibration protection sys-
Trouble tem problem.
Gas Ratio Valve Position The gas ratio valve feed-
Servo Trouble back signal is abnormal.
Gas Control Valve Servo The gas control valve
Trouble feedback signal is abnor-
mal.
Gas Fuel Intervalve Pres- Pressure sensed between
sure Trouble the gas control valve and
the speed ratio valve is ab-
normal.
Gas Fuel Pressure Low Gas fuel pressure to tur-
bine has been sensed as
low.
Isolate problem and correct.
Check and reconnect thermocouples.
Check thermocouples.
Analyze data for trends. At earliest shut-
down check thermocouples. Perform bore-
scope or combustion inspection. Check flow
divider fuel pressures. Check for plugged
nozzles.
Analyze data for trends. Perform borescope
or combustion inspection. Check flow di-
vider, fuel pressures. Check for plugged
nozzles.
Check vibration protection system.
Check that the hydraulic ratchet is operating
properly. Check for mechanical failures, ob-
serve vibration level on the next startup.
Check vibration sensors and wiring.
Check impedance of each vibration detec-
tor.
Monitor vibration readings.
Check vibration protection system.
Check LVDT.
Check LVDT.
Check GRV control system, intervalve vent,
and pressure transducer.
Check cause of low supply pressure.