Basler Electric DGC-2020 - Manual (Page 254)

Name Description Symbol
MAINSBRK This element is used to connect the breaker open and close
output signals from the DGC-2020 to physical output contacts
to open and close the mains breaker and map breaker status
feedback to a contact input. In addition, contact inputs can be
mapped to allow switches to be implemented to manually
initiate breaker open and close requests.
This element is only available when the Mains Breaker
Hardware in configured on the Breaker Hardware screen via
the Breaker Management tree branch.
Inputs
Status: This input allows a contact input to be mapped that will
provide breaker status feedback to the DGC-2020. When the
contact input is closed, the breaker is indicated to be closed.
When the contact input is open, the breaker is indicated to be
open.
Open: This input allows a contact input to be mapped that can
be used to initiate a manual breaker open request. When this
input is pulsed closed while the DGC-2020 is in RUN or AUTO
mode, the breaker will open.
Close: This input allows a contact input to be mapped that can
be used to initiate a manual breaker close request. When this
input is pulsed and the DGC-2020 is in AUTO or RUN mode,
and the generator is stable, a close request will be initiated. If
the Dead Bus Close Enable parameter is true, and the bus is
dead, the breaker will close. If the bus is stable, the DGC-
2020 will synchronize the generator to the bus, and then close
the breaker. If the synchronizer option is not available, the
DGC-2020 can still close the breaker if some external means
is employed to synchronize the generator to the bus.
Outputs
The outputs must be mapped to the contact outputs of the
DGC-2020 that will be used to drive the breaker.
Open: This output is pulsed true (closes the output contact it is
mapped to) when the DGC-2020 is providing a signal to the
breaker to open. It will be a pulse if the Breaker Output
Contact Type is set to Pulse on the Breaker Hardware screen
under Breaker Management in the Settings Explorer, and the
length is determined by the Open Pulse Time. It will be a
constant output if the Mains Breaker Hardware Contact Type
is set to continuous. Note the pulse time must be set long
enough for the breaker to actually open before the pulse is
removed.
Close: This output is pulsed true (closes the output contact it
is mapped to) when the DGC-2020 is providing a signal to the
breaker to close. It will be a pulse if the Breaker Output
Contact Type is set to Pulse on the Breaker Hardware screen
under Breaker Management in the Settings Explorer, and the
length is determined by the Open Pulse Time. It will be a
constant output if the Mains Breaker Hardware Contact Type
is set to continuous. Note the pulse time must be set long
enough for the breaker to actually open before the pulse is
removed.
NOTE
When using the DGC-2020 synchronizer, it is
recommended that local DGC-2020 relay outputs be used
for breaker closing commands to minimize the possibility
of closures outside of desired breaker closing angles.
If remote (CEM-2020) outputs are to be used for breaker
close commands, it is recommended that the anticipatory
synchronizer type be used, and the breaker close wait time
be adjusted to account for possible CEM-2020 output
delays (typically 50 ms) to achieve desired breaker closing
angles.
5-26 DGC-2020 BESTlogic ™ Plus Programmable Logic 9400200990 Rev X