Generac Power Systems MGG155 Operating Manual page 55

NT
Alarm/History
Record
MPR Pmains IDMT
BOR PbusL IDMT
BOC NCB fail
Wrn BadPwrCfg
WrnTstOnLdFail
Wrn SpdRegLim
Wrn VoltRegLim
G L neg8
G ph+L neg8
G ph opposed8
M L neg9
M ph+L neg9
35319 C
Table 8 - Digital Controller List of Alarms
Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-
nite minimum time protection which is based on the mains power. Protection reaction
time depends on mains power value. High mains overload means short reaction time
whereas low mains overload means longer reaction time.
This protection is active if the Mns2POvrldProt setpoint is set to ENABLED. Protection is
based on setpoints Mains protect: OverldStrtEval and 2POverldStEvDel.
Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-
nite minimum time protection which is based on the left bus power. Protection reaction
time depends on the left bus power value. High left bus overload means short reaction
time whereas low left bus overload means longer reaction time.
This protection is active if the BusL2POvrldProt setpoint is set to ENABLED. Protection
is based on setpoints BusL protect: OverldStrtEval and 2POverldStEvDel.
NCB fail is detected if the NeutralCB fdb input doesn't follow Neutral CB C/O output
within 400 ms.
Power format is set differently in controllers which are part of the same control group.
Check Power formats setting in GenConfig on the Miscellaneous card (available in the
Advanced mode only).
This alarm is issued if the Test on load function is activated (by closing corresponding BI)
and genset is not able to take over mains load completely (mains import = 0) within the
Sync/Load ctrl: Load ramp time. Message "WrnTstOnLdFail" is recorded into controller
history in case of this failure. It is either necessary to extend the Load ramp time or check
engine speed regulation.
This alarm indicates that controller Speed governor output has reached its limit. Warning
is issued if Speed governor output stays close to one of the limit values for more than two
seconds. Close to one of the limits means that Speed governor output value is within
SpeedGovLowLim+0,2V range or SpeedGovHiLim-0,2V range.
This alarm gives you information that engine speed governor is either connected in a
wrong way or one of the speed control related regulation loops6 is set in a wrong way.
Warning is blocked if binary output functions SPEED up and SPEED down are config-
ured.
Refer also to Sync/load control.
This alarm indicates that controller AVRi output has reached its limit. Warning is issued if
the AVRi output stays close to 0% or 100% limit for more than two seconds. Close to limit
means that AVRi output value is either <2% or >98%.
This alarm gives you information that generator voltage regulator is either connected in a
wrong way or one of the voltage control related regulation loops is set in wrong way.
Warning is blocked if binary output functions AVR up or AVR down are configured.
Refer also to Volt/PF control adjustment chapter in an IGS-NT-x.y-Reference Guide.
Generator phase is inverted. Check generator phases connection, one of generator
phases is connected the other way round (swap generator coil leads connection).
Wrong generator phases sequence, additionally one phase is inverted.
Wrong generator phases sequence.
Mains phase is inverted. Check mains transformer phases connection, one of trans-
former phases is connected the other way round (swap transformer coil leads connec-
tion).
Wrong mains phases sequence, additionally one phase is inverted.
MGG155/210 Operating Manual
Description
Troubleshooting
51