4.2.5
Closing the genset breaker
Mode Procedure
AUTO
When the controller is in AUTO mode, the genset breaker is controlled automatically and the display unit
push-buttons are disabled. If the power management system calculations show that more power is
required, the controller automatically starts the genset(s) and closes the breaker(s), according to the
genset priority order.
SEMI
The genset must be running to close the genset breaker. If the genset is not running, press to start
the genset. See Starting the genset for more information.
To close the breaker:
1. Operator action: Press
to close the genset breaker.
a. System response: The power management system synchronises the genset with the busbar.
During synchronisation, the breaker LED is yellow (flashing).
b. System response: When the genset and busbar are synchronised, the controller closes the
breaker. When the breaker is closed, the breaker LED is green.
• If the genset and busbar are not synchronised before the synchronisation timer expires, the
breaker does not close. The synchronisation failure alarm is activated.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The genset
breaker can only be closed using the switchboard.
4.2.6 Opening the genset breaker
Mode Procedure
AUTO
When the controller is in AUTO mode, the genset breaker is controlled automatically and the display unit
push-buttons are disabled. If power is not required, the controller will automatically open the genset
breaker as part of the genset stop sequence.
SEMI
To open the genset breaker:
1. Operator action: Press to open the genset breaker.
a. System response: The power management system calculates whether there will be enough power
available after the genset breaker is opened. If not, the power management system will not allow
the genset breaker to open, and the controller display unit will show an info message.
b. System response: The power management system de-loads the breaker until the load is less than
the de-load open point. During de-loading, the breaker LED is yellow (flashing).
c. System response: The controller opens the genset breaker. The breaker LED is OFF when the
breaker is open.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The breaker
can only be opened using the switchboard.
PPM 300 Operator's manual 4189340910 UK
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