Generac Power Systems MGG155 Operating Manual page 54

Troubleshooting
NT
Alarm/History
Record
Mains Avg x >V
MP fmns under
MP fmns over
Bus meas error
OfL StartBlck
StartBlck
BOC IDMT
MPR Imains IDMT
BOR IbusL IDMT
BOC ShortCurr
BOC Overload
50
Table 8 - Digital Controller List of Alarms
If the value of 10 min. average mains voltage of any phase (Mains Avg V1, Mains Avg
V2, Mains Avg V3) exceed value given by setpoint Mains Avg >V MP (Mains protect
group), the MCB is opened and message Mains Avg x >V appears in alarm list and his-
tory record. BO Common MP is activated (x indicates number of phase).
Mains frequency was under the Mains <f limit for Mains f del time. Under frequency pro-
tection is based on Mains protect: Mains <f and Mains f del setpoints.
Mains frequency was over the Mains >f limit for Mains f del time. Over frequency protec-
tion is based on Mains protect: Mains >f and Mains f del setpoints.
Bus measurement error is issued if bus voltage is out of limits. For details, see descrip-
tion of the Gener protect: BusMeasError setpoint in IGS-NT-x.y-Reference Guide.
This alarm indicates wrong setpoints setting that disables engine start or load takeover.
Incorrect combination of ProcessControl: Island enable; ParallelEnable; Synchro
enable; MF start enable setpoints setting is the reason why this alarm is issued.
See AUT mode section of the OFF-MAN-AUT mode chapter in IGS-NT-x.y-Reference
Guide for SPTM, SPI or COMBI application.
This alarm indicates wrong setpoints setting that disables start of gensets. Incorrect
combination of ProcessControl: Island enable; ParallelEnable; Synchro enable; MF
start enablesetpoints setting is the reason why this alarm is issued.
See OFF-MAN-AUT mode chapter in IM-NT-MCB-MGCB Reference Guide.
Indicates current IDMT protection activation. Current IDMT protection is inverse definite
minimum time protection which is based on the generator current. Protection reaction
time depends on overcurrent value. High overcurrent means short reaction time whereas
low overcurrent means longer reaction time. Protection is based on setpoints Generator
protect: 2Inom del and Basic settings: Nomin current.
Indicates current IDMT protection activation. Current IDMT protection is inverse definite
minimum time protection which is based on the mains current. Protection reaction time
depends on overcurrent value. High overcurrent means short reaction time whereas low
overcurrent means longer reaction time.
This protection is active if the Mns2Inom prot setpoint is set to ENABLED. Protection is
based on setpoints Mains protect: Mains2Inom del and Basic settings: Nomin current.
Indicates current IDMT protection activation. Current IDMT protection is inverse definite
minimum time protection which is based on the left bus current. Protection reaction time
depends on overcurrent value. High overcurrent means short reaction time whereas low
overcurrent means longer reaction time.
This protection is active if the BusL2Inom prot setpoint is set to ENABLED. Protection is
based on setpoints BusL protect: BusL2Inom del and Basic settings: Nomin current.
Generator short current protection was activated. Generator current was over Generator
protect: Ishort level for Ishort del. time.
Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-
nite minimum time protection which is based on the generator power. Protection reaction
time depends on generator power value. High generator overload means short reaction
time whereas low generator overload means longer reaction time. Protection is based on
setpoints Generator protect: OverldStrtEval and 2POverldStEvDel.
MGG155/210 Operating Manual
Description
35319 C