Manual 37240C GCP-30 Series - Genset Control
Chapter 3.
Special Applications
Disable Emergency Power via Discrete Input
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NOTE
This functionality is implemented in all GCP-30s with software version 4.3010 or later.
This function allows to disable an emergency operation with discrete input 11 (terminal 68). If the discrete input
has been configured as control input, an emergency operation may be terminated by energizing this discrete in-
put. Energizing the discrete input has the same effect as the configuration of the parameter "Emergency power"
to OFF.
Emergency OFF
by Ter.68 OFF
Prevent an emergency power operation via terminal 68 ON/OFF
OFF..............This terminal is used as an alarm input.
ON................This terminal is used as control input.
• High signal If this terminal utilizes a HIGH signal (energized), an
emergency power operation is prevented or termi-
nated. The unit operates as if Parameter "Emergency
power" is disabled.
• Low signal If this terminal utilizes a LOW signal (de-energized),
the setting of Parameter "Emergency power" is taken
over.
If the parameter "Emergency OFF by Ter.68" is configured ON, an emergency operation may be prevented by
energizing the discrete input at terminal 68.
If an emergency operation has already been initiated before energizing the discrete input at terminal 68, the em-
regency operation may also be terminated by energizing the discrete input at terminal 68.
Exception: If the breaker logic Parallel, Closed transition, or Interchange is selected and the discrete input at
terminal 53 is energized, an emergency operation with already closed GCB may not be terminated by energizing
the discrete input at terminal 68.
Explanation: When energizing the discrete input at terminal 53 (Enable MCB), a synchronization of the MCB
will be achieved before terminating the emergency operation. But this cannot be performed because no mains
power is present.
Solution: If an emergency operation with already closed GCB is to be terminated, a "GCB open" signal must be
generated externally together with energizing the discrete input at terminal 68. If the GCB is opened then and the
discrete input at terminal 68 is still activated, the GCP will not try to close the GCB anymore.
© Woodward Page 31/38
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