Manual 37128A GCP-20 Series - Genset Control
© Woodward Page 45/190
Close MCB without Synchronization (Dead Bus Operation MCB)
Automatic operation
• the "AUTOMATIC" operating mode has been selected
• the release "Dead bus operation MCB" is set to "ON"while inconfiguration mode
• no voltage is applied to the busbar
• the mains voltage is applied (in the case of emergency power the mains settling time has
been finished)
• the mains voltage and frequency are within the preset limits
• the "response: GCB is open" is present (the GCB is open)
• the input "release MCB" is set
• With a load sharing via CAN-Bus (Woodward units)
- none of the MCBs may be closed if a isolated operation in parallel with other gensets
is possible
- the unit with the lowest unit number will be the first to close its MCB
Manual operation
• the "MANUAL" operating mode has been selected
• no voltage is applied to the busbar or busbar voltage is below 20V
• the mains voltage is applied
• the "response: GCB is open" is present (the GCB is open)
• the input "release MCB" is set
• the button "MCB ON" has been activated
• with a load sharing via CAN-Bus (Woodward units)
- none of the MCBs may be closed in case of a isolated operation in parallel with other
gensets
- the unit with the lowest unit number will be the first to close its MCB
Opening the GCB
The generator power circuit breaker is opened both when the relay "Command: Close GCB" de-energizes (only if
"constant" has been selected for the GCB closing relay in configuration mode), and via the closure of the relay
"Command: Open GCB". The GCB will be opened under the following circumstances:
• In case of a response of a mains monitor with decoupling to GCB
• while in operating mode "STOP"
• if alarm class 2 or 3 occurs
• when actuating the button "GCB OFF" or "MCB ON" (depending on the preset switch
logic) while in manual operation or load test operation
• when actuating the button "STOP" while in manual operation
• when settling automatically while in the AUTOMATIC operating mode
• after synchronizing the MCB
• prior to switching to the dead busbar of the MCB in a automatic transfer switching
• while in sprinkler operation, provided that no emergency power case is present
Opening the MCB
The mains power circuit breaker is opened via the closure of the relay "Command: Open MCB" (the "constant"
setting is not possible for the MCB). The MCB will be opened under the following circumstances:
• In case of a respond of a mains monitor, provided that the mains decoupling is set to
MCB
• In the case that the emergency power (loss of mains) is responding and successful engine
start
• following synchronizing of the GCB
• prior to the closing of the GCB in an automatic transfer switching
• when actuating the button "MCB OFF" or "GCB ON" (depending on the preset switch
logic) while in manual operation or load test operation
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