• 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.
NOTE:
Functional CAN2 communication between the controllers is required for
this function.
PRINCIPIAL SCHEME OF A SITE IF NEUTRAL CONT = EACH
The COMMON option should be used if there is one common neutral contactor for
the whole site. The outputs Neutral CB C/O 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.
NOTE:
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.
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