Control Procedure
PMS control
To close the bus tie breaker:
1. Operator action: Press
to close the bus tie breaker.
a. System response: The power management system synchronises busbar A and busbar B. During
synchronisation, the breaker LED is yellow (flashing).
b. System response: When the bus tie breaker is synchronised, the controller closes the bus tie
breaker. When the breaker is closed, the breaker LED is green.
• If the bus tie breaker is not synchronised before the synchronisation timer expires, the breaker
does not close. The synchronisation failure alarm is activated.
c. System response: After the bus tie breaker is closed, the power management system may
automatically start certain gensets, and stop others, according to the genset start and stop priority
order. Automatic start and stop only applies to the gensets of all the GENSET controllers that are in
AUTO mode.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The bus tie
breaker can only be closed using the switchboard.
4.6.3
Opening the bus tie breaker
When the bus tie breaker is open, the busbar is split into two independent busbars (busbar A and busbar B). There must
therefore be enough gensets available (on each busbar) to supply the load required (on each busbar) before the operator can
open the bus tie breaker.
Control Procedure
PMS control
To open the bus tie breaker:
1. Operator action: Press
to open the bus tie breaker.
a. System response: The power management system calculates whether there will be enough power
available on each busbar after the bus tie breaker is opened. If not, the power management
system will not allow the bus tie breaker to open, and the controller display unit will show an info
message.
• If GENSET controllers in AUTO mode are ready for operation, but not connected, the power
management system starts and connects the required gensets so that the required power is
available.
b. System response: The power management system de-loads the bus tie breaker. During de-
loading, the breaker LED is yellow (flashing).
c. System response: When the bus tie breaker is de-loaded, the controller opens the bus tie breaker.
When the breaker is open, the breaker LED is OFF.
• If the bus tie breaker is not de-loaded before the de-load timer expires, the breaker does not
open. The de-load failure alarm is activated.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The bus tie
breaker can only be opened using the switchboard.
PPM 300 Operator's manual 4189340910 UK
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