InteliATS
NT
STD, SW version 2.0, ©ComAp – June 2010
45
IA-NT- STD-2.0-Reference Guide.pdf
ing
Circuit breakers tim
Relation between Mains fail and MCB and start of gen-set
s >Freq. After
ned.
Mains fail is detected as Mains <V, Mains >V, Mains V Unbal, Mains <Freq, Main
detection MCB is ope
N
OTE
:
When MCB 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
Preset delay
genset start
Relation between Mains return and MCB
MAN Mode, GCB and MCB are opened
Mains return
MCB closed (only when genset is
not running and GCB is opened)
1 sec.
Relation between GCB and MCB
Conditions: AUTO Mode, Mains =off, MCB = opened, GCB = closed, gen-set loaded.
Mains returns: GCB opens (according 3.,
MainsReturnDel
), MCB closes (
1 sec
)
GCB opened
MCB closed
1 sec.
