IGS-NT-BC, SW Version 1.2.0,
©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
70
•
The output is always opened while the gen-set is not running.
•
The output is always opened while the MCB is closed.
•
While the gen-set is running and GCB is open, the output closes when
generator voltage in at least one phase exceeds 85% of the nominal
voltage. It opens when the generator voltage in all phases drops below
50% of the nominal voltage.
•
While the gen-set is running, MCB is open and GCB is closed, then the
position of the output is given by an internal algorithm, which ensures, that
always exactly one gen-set connected to the bus has the neutral contactor
closed.
N
OTE
:
Functional CAN2 communication between the controllers is required for
this function.
P
RINCIPIAL SCHEME OF A SITE IF
N
EUTRAL CONT
=
EACH
The
COMMON
option should be used if there is one common neutral contactor for
from all controllers are combined
together and the combined signal is used to control the breaker. Three-pole GCB
must be used for this case.
•
The output is always opened while the gen-set is not running.
•
The output is always opened while the MCB is closed.
•
While the gen-set is running the output closes when generator voltage in at
least one phase exceeds 85% of the nominal voltage. It opens when the
generator voltage in all phases drops below 50% of the nominal voltage.
That means if at least one gen-set in the site is running and having proper
voltage, the neutral breaker is closed.
N
OTE
:
If there are more logical groups the "common" option is related to the group. That
means one common neutral contactor is expected for each group.
