4.5.3
Opening the shore connection breaker
Control Procedure
PMS control
When the operator opens the shore connection breaker, the power management system transfers the load
from the shore connection to the gensets. There must therefore be enough gensets available, with enough
capacity to take over the shore connection load.
To open the shore connection breaker:
1. Operator action: Press to open the shore connection breaker.
a. System response: The power management system calculates whether there will be enough power
available after the shore connection breaker is opened. If not, the power management system will
not allow the shore connection 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.
• If the gensets do not have the capacity to take over the shore connection load, the controller
does not open the shore connection breaker, and displays an info message.
b. System response: The power management system de-loads the shore connection breaker. During
de-loading, the breaker LED is yellow (flashing).
c. System response: When the shaft generator breaker is de-loaded, the controller opens the shore
connection breaker. When the breaker is open, the breaker LED is OFF.
• If the shore connection breaker is not de-loaded, the breaker does not open. The de-load failure
alarm is activated when the de-load timer expires.
Switchboard
control
When the controller is under switchboard control, the display unit push-buttons are disabled. The shore
connection breaker can only be opened using the switchboard.
4.6 BUS TIE breaker controller basic actions
4.6.1 Introduction to operating the BUS TIE breaker controller
Normal operation
The BUS TIE breaker controller normally runs in under power management system (PMS) control.
Blackout response
If there is a blackout, the PMS automatically follows the blackout recovery sequence in order to restore power. As part of the
blackout recovery, if one of the busbars is live and auto close is enabled, the PMS attempts to close the tie breaker. No
operator actions are needed.
However, if there is a blackout while the BUS TIE breaker controller is under switchboard control, the PMS will not attempt to
connect the busbars. If the operator wants the PMS to connect the busbars, the operator needs to change the switchboard
control selector to PMS control.
4.6.2 Closing the bus tie breaker
When the bus tie breaker is closed, the busbar is reconnected. The reconnected busbar acts as one busbar, and not as two
independent busbars.
PPM 300 Operator's manual 4189340910 UK
www.deif.com Page 51 of 157
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