• The command SCB action open without de-loading is activated by digital input or from an external source. The PMS
opens the SCB without de-loading.
• The command can come from an external source.
2. Open conditions OK: The power management system (PMS) checks that the open conditions are present:
• There must be enough gensets in AUTO mode, and/or connected in SEMI mode, to take over the shore connection load
and/or de-load the SCB when the SCB opens.
• A second shore connection or genset must be connected to the busbar to trip the SCB during the breaker open sequence.
3. Open breaker selected
• De-load shore connection: The PMS de-loads the shore connection until the load is less than the set point for the breaker
to open. The controller then opens the breaker.
◦ When the de-load timer expires, the De-load failure alarm is triggered. After the alarm is triggered the controller will
continue to try to de-load the SCB until it succeeds.
Open without de-loading selected
• The controller opens the breaker without de-loading.
4. SCB opened: The controller checks whether the SCB has opened.
• If the SCB has opened, the SCB open sequence has been completed successfully.
• If the SCB has not opened, an SCB open failure alarm is activated.
11.3.4 Shore connection breaker blackout close flowchart
The following flowchart shows the sequence that the controller uses to connect the shore connection to a black busbar.
More information
See Power management, Blackout for more information.
DESIGNER'S HANDBOOK 4189340911K UK Page 385 of 521
To Next Page
Loading...
