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AMF26-P, SW version 2.4, ©ComAp – January 2016 118
AMF26-P-2.4 Reference Guide.pdf
GCB, MCB fail detection
MCB and/or GCB fail detection is based on binary output CB CLOSE/OPEN comparing with binary
input MCB and/or GCB FEEDBACK.
There are three different time delays for CB fail detection – see following diagrams.
When is BO GCB close/open (MCB Close/Open) in steady state and GCB feedback (MCB feedback)
is changed the GCB fail is detected immediately (no delay).
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
Alarm detection:
immediatelly
active
closed
opened
Alarm: GCB fail
BI GCB feedback
BO GCB close/open
Alarm detection:
immediatelly
active
opened
closed
When BO GCB close/open (MCB Close/Open) opens there is 5 sec delay for GCB fail (MCB fail)
detection.
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
active
opened
opened
Time delay
5 sec
When BO GCB close/open (MCB Close/Open) closes, there is 5sec delay for GCB fail (MCB fail)
detection:
Alarm: GCB fail
BO GCB close/open
BI GCB feedback
active
closed
closed
Time delay
5 or 2 sec
Hint:
You can solve state of MCB fail by pressing Fault Reset button.
Range of measurement
100%
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