InteliATS
NT
PWR, SW version 1.0, ©ComAp – March 2009
50
IA-NT- PWR-1.0-Reference Guide R1.pdf
Circuit breakers timing
Relation between Mains fail and MCB and start of gen-set
MCB Opens On =
MAINSFAIL:
Mains fail is detected as Mains <V, Mains >V, Mains V Unbal, Mains <Freq, Mains >Freq. After
detection MCB is opened.
N
OTE
:
When MCB feedback drop-out and measured mains electrical limits (voltage, frequency) are still in
limits, the controller switches MCB ON again.
EmergStart Del
Mains fail
MCB
opened
Mains V Del
or
Mains Freq
Del
or
Mains VUnb Del
genset start
MCB Opens On =
GENRUN:
The MCB is not opened till the engine starts and gets ready to take the load.
Transfer Del
Engine started
MCB opened
MinGenStabTime
GCB closed
MaxGenStartDel
Relation between Mains return and MCB
OFF Mode, GCB and MCB are opened
Mains return
MCB closed (only when genset is
not running and GCB is opened)
MCB Close Del
