InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf,
©ComAp – April 2015
142
9
Circuit breakers operation sequence,
MGCB/MCB fail detection
9.1
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.
W
ARNING
!
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. Should this be the
case, the following solution is proposed:
Rename the VPIO to suitable name
(e.g. StrtBlkMCBfail, which indicates that
it blocks the start of the group)
Choose Wrn MCB fail from Prg. States group on
any VPIO output
No need to adjust the delay since the protection is only
informational
Toggle on the protection for the interconnected VPIO input
(e.g. BI VPIO-1 1 is interconnected with BO VPIO-1 1)
Set the type of the
protection to Alarm only
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