InteliGen
NT
, InteliSys
NT
, InteliMains
NT
– Troubleshooting Guide,
SW version IGS-NT-3.1.0, IM-NT-3.1.0, ©ComAp
– August 2018
34
IGS-NT Troubleshooting Guide.pdf
IGS-NT Alarm/History
record
Alarm/
History
Appeara
nce
Description
generator current transformers (CT
’s) are connected in a
wrong way.
20
MP L1, L2 or L3 under
A+H
Mains L1, L2 or L3 voltage was under the
Mains <V MP
limit for
Mains V del
time
.
Undervoltage protections are
based on
Mains protect
:
Mains <V MP
and
Mains V del
setpoints. 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.
MP L1, L2 or L3 over
A+H
Mains L1, L2 or L3 voltage was over the
Mains >V MP
limit for
Mains V del
time
.
Overvoltage protections are
based on
Mains protect
:
Mains >V MP
and
Mains V del
setpoints. 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.
MP L12, L23 or L31 under
A+H
Mains L12, L23 or L31 voltage was under the
Mains <V
MP
limit for
Mains V del
time
.
Undervoltage protections are
based on
Mains protect
:
Mains <V MP
and
Mains V del
setpoints. This alarm is issued if voltage protections are
based on phase to phase voltages. It means that
Basic
settings
:
FixVoltProtSel
is set to PHASE-PHASE.
MP L12, L23 or L31 over
A+H
Mains L12, L23 or L31 voltage was over the
Mains >V MP
limit for
Mains V del
time
.
Overvoltage protections are
based on
Mains protect
:
Mains >V MP
and
Mains V del
setpoints. This alarm is issued if voltage protections are
based on phase to phase voltages. It means that
Basic
settings
:
FixVoltProtSel
is set to PHASE-PHASE.
Mains Avg x >V
A+H
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 history record. BO
Common MP
is activated (
x indicates number of phase
).
MP fmns under
A+H
Mains frequency was under the
Mains <f
limit for
Mains f
del
time
.
Under frequency protection is based on
Mains
protect
:
Mains <f
and
Mains f del
setpoints.
MP fmns over
A+H
Mains frequency was over the
Mains >f
limit for
Mains f del
time
.
Over frequency protection is based on
Mains
protect
:
Mains >f
and
Mains f del
setpoints.
ROCOF
H
If measured value of df/dt (mains frequency) exceed
ROCOF df/dt
(setpoint in
Mains protect
group)
,
ROCOF
protection is activated. ROCOF protection trips mains
circuit breaker (MCB). The message
ROCOF
is writen in
history of controller. Value of df/dt is evaluated from mains
voltage.
BusL L1, L2 or L3 under
H
Left bus L1,L2 or L3 voltage was under the
BusLeft <V
limit for the
BusLeft V del
time
.
Information about that is
recorded into controller history.
Setpoint
BusL protect
:
BusL Volt prot
has to be set to
ENABLED if healthy bus voltage detection and history
record are requested. Voltage has to be over the
BusLeft
<V
limit if BTB synchronisation should be started, because
the
BusLeft <V
setpoint is used for healthy bus detection
(this condition applies only if
BusL Volt prot
is set to
ENABLED).
This alarm is issued if voltage protections are based on