ComAp IG-NT GC Reference Manual page 28

BO GCB close/open
opened
BI GCB feedback
Time delay
Alarm: GCB fail

In case that CB fail is detected after switching the controller on (CB is closed), the CB OFF coil output is
activated immediatelly.
N :
OTE
If the MCB or GCB feedback gets active during synchronization the breaker is imediately closed.
C !
AUTION
In case that MCB feedback is active (MCB is expected as closed) and "MCB fail" is reported due to previous
incorrect manipulation of MCB, in the moment of Fault reset, the MCB fail is cleared and the controller
internally goes to "closed" state. I.e. MCB fdb status is confirmed and the output MCB close/open is
energized.
MCB fail Information
Opening of the MCB externally is allowed because external protection device may open it based on its
protections. The controller will try to reclose the breaker if Mains protect type protection is not configured
accordingly (e.g. external protection device/relay does not allow user to send this type of signal or such
wiring is impractical). After failed attempt to close the breaker, the controller issues standard alarm and in
AUT mode starts the engine and consequently closes GCB breaker.
Warning!
In this case, if the supposed opening of the MCB is caused merely by MCB feedback failure and
the actual position of the MCB is still closed, the controller will close GCB to the Mains voltage
directly without synchronizing because it cannot be distinguished what exactly happened. This
situation can be possibly harmful to the personnel or the equipment. Should this be the case, the
following solution is proposed:
Inteli NT GeCon-MARINE SPI, SW Version 3.2, ©ComAp – July 2015
IGS-NT-GeCon-MARINE-SPI-3.2.PDF
opened
active
5 sec
Rename the VPIO to suitable name
(e.g. L2 MCB fail, which indicates that it is
Level 2 alarm)
Choose Wrn MCB fail from Prg. States group on
any VPIO output
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