IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
Setpoint: MCB Opens on
This setpoint selects the in which moment the MCB is opened after the mains
failed.
The MCB is opened immediately when the mains failure is
detected. This option expects the breaker is able to be
controlled even there is no AC voltage at the moment, as the
mains is failed and the genset is not running yet. Use this
option for contators, for breakers equipped with undervoltage
release coil or for breakers controlled by 24VDC.
The MCB open command is issued not until the gen-set is
running and providing voltage (prior to GCB is closed!!). Use
this option for AC controlled breakers. The wiring of the
breaker control must be provided in such a way, that it
automatically switches the AC control voltage either from the
mains incomer (before MCB) or directly from the generator.
Setpoint: ReturnWithIntr
The setpoint adjusts behavior of the controller if the reverse synchronizing to the
restored mains was not successful.
If the reverse synchronization to the restored mains is not
successful (i.e. Sync fail alarm is issued) the load is then
transferred back to the mains by "changeover" sequence.
The load remains to be supplied from the genset if the reverse
synchronization is not successful. After the Sync fail alarm is
reset the controller performs next attempt of reverse
synchronization.
Setpoint: BreakerOverlap
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