IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
Circuit breakers operation sequence, GCB/MCB fail detection
NOTE:
In the following text, “CB” abbreviation is used for MCB or GCB respectively.
Related binary inputs:
- CB fdb – CB feedback binary input
- CB fdb neg – negative CB feedback binary input. Used for increasing the reliability of CB status
evaluated by the controller. In case that it is not configured, negative value of CB fdb is calculated
internally within the controller.
Related binary outputs:
- CB close/open – output for circuit breaker. Equals to 1 during the time when CB is requested o be
closed.
- CB ON coil – output for closing coil of the CB. 2s pulse (5s if synchronising is not provided by the
particuilar CB) is used for closing the CB.
- CB OFF coil – output for opening coil of the CB. 2s pulse (5s if synchronising is not provided by the
particuilar CB) is used for opening the CB.
- CB UV coil – output for undervoltage coil of the CB. Permanently active, 2s negative pulse (5s if
synchronising is not provided by the particuilar CB) is used for CB opening request
- CB status – output indicating CB status as evaluated by the controller. This signal is used for lighting
LEDs on the panel, switching the regulations, CB fail evaluation, etc.
Possible CB sequences:
CB close command:
minimum 1s from UV switching on,
together with MinStab time elapsing is
necessary before the CB is allowed to
close
When closing the CB, the CB status LBO
switches over only when both feedbacks
are in correct position
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