Troubleshooting
50
MGG155/210 Operating Manual
35319 C
Mains Avg x >V
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
).
MP fmns under
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.
MP fmns over
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 meas error
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.
OfL StartBlck
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.
StartBlck
This alarm indicates wrong setpoints setting that disables start of gensets. Incorrect
combination of
ProcessControl
:
Island enable; ParallelEnable; Synchro enable; MF
start enable
setpoints setting is the reason why this alarm is issued.
See
OFF-MAN-AUT mode
chapter in IM-NT-MCB-MGCB Reference Guide.
BOC IDMT
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.
MPR Imains IDMT
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.
BOR IbusL IDMT
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.
BOC ShortCurr
Generator short current protection was activated. Generator current was over
Generator
protect
:
Ishort
level for
Ishort del.
time.
BOC Overload
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.
Table 8 - Digital Controller List of Alarms
NT
Alarm/History
Record
Description
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