removed, a close command to the breaker from the controller could potentially connect a generator and a live BB out of
sync.
INFO
When a genset controller is in racked out breaker mode it will not be possible to use ground relay function. See Option G5
for more information about ground relay.
6.16 Digital mains breaker control
The controller will normally execute the automatic mains failure sequence based on the settings adjusted in the system setup.
Besides these settings it is possible to configure a digital input that can be used to control the mains return sequence. This input is
the "mains OK" input. The purpose of this function is to let an external device or an operator control the mains return sequence. The
external device can e.g. be a PLC.
The flowchart below shows that if the input is configured, it needs to be activated (by a pulse) in order to initiate the mains return
sequence. The load will continue on generator supply if the input is not activated.
The mains OK delay is not used at all when the "Mains OK" input is configured.
Mains OK
Mains OK
delay
MB input
configured
Expired
MB control
input
ON
MB and GB
operation
Sequence
Yes
No
No No
Yes
Yes
6.17 Overlap
The purpose of the overlap function is to be able to define a maximum paralleling time between the generator and the mains supply.
The function is typically used if there are local requirements to maximum allowed paralleling time.
INFO
The overlap function is only available in the automatic mains failure and load takeover genset modes.
DESIGNER'S HANDBOOK 4189341275A EN Page 134 of 196
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