Mode Procedure
AUTO
When the controller is in AUTO mode, the tie breaker is controlled automatically and the display unit push-
buttons are disabled.
After a blackout, when stable power is restored on the main busbar, the power management system
automatically synchronises to the main busbar and closes the tie breaker.
SEMI
To close the tie breaker:
1. Operator action: Press
to close the tie breaker.
a. System response: The power management system synchronises the emergency busbar and the
main busbar. During synchronisation, the breaker LED is yellow (flashing).
• For the tie breaker to close, the busbar LED must be green. If there has been a blackout on the
main busbar, the EMERGENCY genset controller cannot close the tie breaker until one or more
ordinary gensets have started and there is stable power on the main busbar.
b. System response: When the tie breaker is synchronised, the controller closes the tie breaker.
When the tie breaker is closed, the breaker LED is green.
• If the tie breaker is not synchronised before the synchronisation timer expires, the breaker does
not close. The synchronisation failure alarm is activated.
• System response: If there is no blackout and the emergency genset breaker is closed, the maximum
parallel timer starts running when the tie breaker is closed. If harbour operation is not activated, when
the timer runs out, the controller will try to open the emergency genset breaker.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The tie
breaker can only be closed using the switchboard.
4.3.8
Opening the tie breaker
The tie breaker is normally closed.
As part of the blackout procedure, if power cannot be restored from the gensets within the specified time, the tie breaker
opens automatically, and the main busbar is split from the emergency busbar. The emergency genset then supplies power to
the emergency busbar. The main busbar and the emergency busbar run as two independent busbars until stable power is
restored on the main busbar.
INFO
The EMERGENCY genset controller display unit has two sets of breaker push-buttons. The tie breaker push-
buttons are on the right.
PPM 300 Operator's manual 4189340910 UK
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