InteliLite
NT
– AMF20/25, SW version 2.2, ©ComAp – September 2014 107
IL-NT-AMF-2.2-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
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.
Generally it is possible to use IL-NT controller without feedback inputs (not configured).
Controller will work with breakers anyway.
