IGS-NT-BC, SW Version 1.2.0, ©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
Binary output: BCB ON Coil
This output is intended for closing of the BCB using ON coil if a circuit breaker is
used as BCB. The output provides 2 sec pulse when the BCB has to close. If
synchronizing is disabled with the particular breaker, the pulse length is extended
to 5sec. See timing diagram of all available breaker control outputs in the
description of the BCB close/open output.
There are also other outputs availabe for BCB control:
• BCB close/open
• BCB OFF coil
• BCB UV coil
Binary output: BCB OFF Coil
This output is intended for opening of the BCB using OFF coil if a circuit breaker
is used as BCB. The output provides 2 sec pulse when the BCB has to open. If
synchronizing is disabled with the particular breaker, the pulse length is extended
to 5sec. See timing diagram of all available breaker control outputs in the
description of the BCB close/open output.
There are also other outputs availabe for BCB control:
• BCB close/open
• BCB ON coil
• BCB UV coil
Binary output: BCB UV Coil
This output is intended for opening of the BCB using an undervoltage coil if a
circuit breaker is used as BCB.
• The output is closed after the gen-set has been started, Min stab time has
elapsed and the generator voltage and frequency has got into limits. BCB
closing command is blocked for 1 sec after the UV coil has been closed to
allow the breaker mechanical system getting ready for closing.
• The output is opened for 2 sec when the BCB has to open. If synchronizing
is disabled with the particular breaker, the length of the inverse pulse is
extended to 5sec.
• The output is closed again and remains closed while the generator voltage
and frequency are in limits, if the Running phase follows after opening of
the BCB (e.g. in MAN).
• The output remains opened if the Cooling phase follows after opening of
the BCB.
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