Mode Procedure
AUTO
When the controller is in AUTO mode, the emergency genset breaker is controlled automatically and the
display unit push-buttons are disabled.
After a blackout, the controller will automatically disconnect and stop the emergency genset when there is
a stable voltage on the main busbar.
SEMI
To open the emergency genset breaker:
1. Operator action: Press
to open the emergency genset breaker.
a. System response: The power management system calculates whether there will be enough power
available after the emergency genset breaker is opened. If not, the power management system will
not allow the emergency genset breaker to open, and the controller display unit will show an info
message.
b. System response: The power management system de-loads the emergency genset 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
emergency genset breaker can only be opened using the switchboard.
4.3.7 Closing the tie breaker
The tie breaker is normally closed. This means that the emergency busbar is normally connected to the main busbar. The
emergency busbar and main busbar normally act as one busbar (and not as two independent busbars).
The tie breaker may be opened and closed automatically for a limited time as part of the test function.
The emergency genset breaker and the tie breaker are both closed for an unlimited time when harbour operation is active.
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
www.deif.com Page 45 of 157
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