GB close
command
GB open
No
Yes
Busbar
V & Hz
OK
Yes
Sync GB
Synchronised
No
Yes
Timer expired
Yes
No
Close GB
GB closed
No
Yes
GB closed
Command
and mode
match
No
Yes
No
Info message
Info message
Info message
Info message
Genset
V & Hz
OK
No
Yes
Alarm
Alarm
1.
Command and mode match:
The controller checks that the command
source and the controller mode match:
•
In AUTO mode, the power management system must send the
command to close the generator breaker. The controller ignores all
other external commands.
•
In SEMI mode, the command to close the generator breaker can come
from the following:
◦
The operator can press the push-button
Close breaker
on the
display unit.
◦
The operator can use PICUS to send a close breaker command.
◦
An external source, like a PLC.
2.
GB open:
The controller checks whether the generator breaker is open. If
the generator breaker is already closed, the sequence stops, and an info
message is shown.
3.
Genset V & Hz OK:
The controller checks whether the voltage and
frequency from the genset are within the allowed range*. If these are not in
the range, then the controller cancels the close command and displays an
info message.
4.
Busbar V & Hz OK:
The controller checks whether the voltage and
frequency on the busbar are within range*. If these are not in the range,
then the controller cancels the close command and displays an info
message.
5.
Sync GB:
The controller tries to synchronise the genset to the busbar.
•
When the genset and busbar are synchronised, the controller activates
the
Breakers > Generator breaker > Control > GB Close
output to close
the breaker.
•
If the genset and busbar do not synchronise within the time allowed, the
controller activates a
GB synchronisation failure
alarm.
6.
GB closed:
The controller checks whether the generator breaker has
closed.
•
If the generator breaker has closed, the generator breaker close
sequence has been completed successfully.
•
If the generator breaker has not closed, the controller activates the
GB
closing failure
alarm.
*Note: See
Configure > Parameters > [Source] / [Busbar] AC setup > Voltage and frequency OK
for these ranges.
8.5.3 Generator breaker blackout close
The power management system can automatically close the generator breaker as part of the blackout response.
More information
See
Power management
,
Blackout
for more information.
DESIGNER'S HANDBOOK 4189340911K UK
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