Woodward GCP-30 Series User Manual

Manual 37365A GCP-30 Series Packages - Genset Control
Page 92/179 © Woodward
The following actions occur in an emergency power operation:
• If emergency power operation is initiated, the engine is started provided the sequence is not interrupted by an
alarm or the operation mode is not changed
• If the mains are restored during the start cycle, the MCB remains closed. The engine starts and continues run-
ning until the mains settling time (Parameter 194) expires. If another mains fault occurs during this time, the
M
CB is opened and the GCB is closed to the dead busbar. The engine shuts down following restoration of the
main and the expiration of the mains settling time (Parameter 194) provided no additional mains faults occur.
•
The GCB will be closed regardless of the engine delay time once the dead bus limits have been reached.
• If the mains are restored while an emergency power operation is being performed and the GCP will wait for
the mains settling time (Parameter 194) to expire. After the mains settling tim
e has expired, the MCB will be
synchronized and closed.
Emergency power: In the event an emergency power operation is being performed, the message "Emergency
power" is displayed on the screen of the GCP.
Emergency Power With Breaker Logic "PARALLEL"
Emergency power: After detecting a mains fault, the GCP-30 will wait until the "emergency power start delay"
(Parameter 138) has expired before start
ing an engine. Once the engine has started and the monitored generator
voltage and frequency have exceeded the dead bus start limits (Parameter 126 and Parameter 127), the MCB is
opened and t
he GCB is closed to the dead busbar. The generator is now supplying power to the load.
Return of the mains: Following the termination of the mains fault, the GCP will continue the emergency power
operation until the mains settling time has expired (Parameter 194) before synchronization of the MCB is in-
itiated
. After closing the MCB, the control returns to its original operation mode. If the engine is to be shut down
after the emergency power operation has terminate, a power reduction (soft unloading) is carried out provided
the real power controller (Parameter 74) is configured as "ON".
If th
e GCP has initiated the start cycle and the mains are restored, the GCP completes the start cycle but the MCB
is not opened. The engine remains in idle mode during the mains settling time (Parameter 194). The engine re-
m
ains running while the mains settling time expires so the GCB can be closed and the MCB opened immediately
in the event of another mains failure.
Emergency Power With Breaker Logic "OPEN TRANSIT."
Emergency power: After detecting a mains fault, the GCP will wait until the "emergency power start delay"
(Parameter 138) has expired before start
ing an engine. Once the engine has started and the monitored generator
voltage and frequency have exceeded the dead bus start limits (Parameter 126 and Parameter 127), the MCB is
opened and t
he GCB is closed to the dead busbar. The generator is now supplying power to the load.
Return of the mains: Following the termination of the mains fault, the GCP will continue the emergency power
operation until the mains settling time has expired (Parameter 194) before the open transition back to main
supply is perform
ed. If an engine request is present following the expiration of the mains settling time (Para-
m
eter 194), the generator will maintain the isolated operation.
If the GCP has initiated the start cycle and the mains are restored, the GCP completes the start cycle but the MCB
is not opened. The engine remains in idle mode during the mains settling time (Parameter 194). The engine re-
m
ains running while the mains settling time expires so the GCB can be closed and the MCB opened immediately
in the event of another mains failure.

Woodward GCP-30 Series Specifications

General

Brand	Woodward
Model	GCP-30 Series
Category	Controller
Language	English