Mode Procedure
AUTO
When the controller is in AUTO mode, the tie breaker is controlled automatically and the display unit push-
buttons are disabled.
SEMI
To open the tie breaker:
1. Operator action: Press
to open the tie breaker.
a. System response: The power management system calculates whether the emergency genset can
supply the load on the emergency busbar after the tie breaker is opened. The power management
system also checks whether the gensets can supply the load on the main busbar after the tie
breaker is opened. If not, the power management system does not allow the tie breaker to open,
and the controller display unit shows an info message.
b. System response: The power management system de-loads the tie breaker. During de-loading, the
breaker LED is yellow (flashing).
c. System response: When the tie breaker is de-loaded, the controller opens the tie breaker. When
the breaker is open, the breaker LED is OFF.
• If the tie breaker is not de-loaded before the de-load timer expires, the breaker does not open.
The de-load failure alarm is activated.
• If the gensets do not have the capacity to supply the load on each busbar, the controller does not
open the tie breaker, and displays an info message.
• System response: If there is a blackout on the main busbar, the tie breaker opens without de-loading,
to protect the supply to the emergency busbar.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The tie
breaker can only be opened using the switchboard.
4.3.9 Emergency genset test function
To run the emergency genset test sequence:
1. Operator action: Press to start the test sequence.
a. System response: The controller starts the test sequence that was configured in the controller.
b. System response: When the test sequence is completed, the controller automatically changes to the mode configured
in the test sequence.
• System response: If there is a blackout during the test sequence, the EMERGENCY genset controller automatically
stops the test sequence, and starts to supply the emergency busbar.
4.4 SHAFT generator controller basic actions
4.4.1 Introduction to operating the SHAFT generator controller
Normal operation
The SHAFT generator controller normally runs under power management system (PMS) control.
PPM 300 Operator's manual 4189340910 UK
www.deif.com Page 47 of 157
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