InteliLite
NT
– AMF20/25, SW version 1.2, ©ComAp – March 2008
65
IL-NT-AMF-Reference Guide1.2.pdf
To load the gen-set
a) Power cut comes or
b) MCB ON/OFF is pressed
When power cut: MCB is opened, after
Fwd Return Del
elapses, GCB is closed.
When the mains recovers gen-set stays supplying island load. To transfer the load back to the healthly
mains, switch the controller to AUT Mode.
Hint:
The controller does not respond to GCB ON/OFF , STOP, START
The load is automatically transferred back to the mains when any gen-set shut down protection
activates.
Test on load
When binary input Rem TEST OnLd is closed, the controller automatically (if TEST mode selected)
transfers load from the mains to the gen-set. Setpoint AutoMainsFail: ReturnFromTEST must be set to
MANUAL.
The setpoint ReturnFromTEST = AUTO
While TEST mode is selected, gen-set is running unloaded.
When power cut comes the controller opens MCB.
After
Return break
elapses, GCB is closed.
When the mains recovers:
a) After
MainsReturn Del
the controller opens the GCB
b) After
Fwd Return Del
delay MCB is closed.
c) The engine stays running
To stop the gen-set select other mode than TEST
Hint:
The controller does not respond to GCB ON/OFF , MCB ON/OFF , STOP, START
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.
Hint
:
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
