Generac Power Systems MGG155 Operating Manual page 52

Troubleshooting
NT
Alarm/History
Record
Start blocking
Wrn CylTemp1-32
Wrn MCB fail
Stp GCB fail
Wrn BTB fail
Wrn MGCB fail
Sd Oil press B
Wrn RSync fail
Stp Sync fail
Wrn Sync fail
BOC L1, L2 or L3 under
48
Table 8 - Digital Controller List of Alarms
This message means that a binary input with Startblocking function is active and engine
start is blocked. If active, NotReady state is shown on the controller screen and the mes-
sage appears in the Alarm list. As soon as input is deactivated, engine start is enabled
again.
Warning protection on AI Cylinder temperature 1-32 is active. Check corresponding set-
points in the Engine protect group.
MCB failure was detected.
See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT-
x.y-Reference Guide.
GCB failure was detected.
See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT-
x.y-Reference Guide.
BTB failure was detected.
See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT-
x.y-Reference Guide. It applies to BTB breaker too.
MGCB failure was detected.
See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT-
x.y-Reference Guide. It applies to MGCB breaker too.
Engine shut-down was activated by binary input with "Oil press" function (see LBI card in
GenConfig for information about source signal for this function).
Reverse synchronization failure indication, genset or group of gensets was not synchro-
nized to mains within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn-
chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn-
chroscope where speed and voltage regulator's outputs, slip frequency and generator
and mains voltages can be observed during the synchronization process.
Synchronization failure indication (alarm Sync timeout is active), genset or group of gen-
sets was not synchronized to mains/bus within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn-
chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn-
chroscope where speed and voltage regulators' outputs, slip frequency and generator
and mains/bus voltages can be observed during the synchronization process.
Synchronization failure indication (alarm Sync timeout is active), genset or group of gen-
sets was not synchronized to mains/bus within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn-
chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn-
chroscope where speed and voltage regulators' outputs, slip frequency and generator
and mains/bus voltages can be observed during the synchronization process.
Generator L1, L2 or L3 voltage was under the Gen <V BOC limit for Gen V del time.
Undervoltage protections are based on Gener protect: Gen <V BOC and Gen V del set-
points. This alarm is issued if voltage protections are based on phase to neutral voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.
MGG155/210 Operating Manual
Description
35319 C