Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 48/190 © Woodward
Power Circuit Breaker Logic
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NOTE
For the description of the switch logics please refer to the chapter Breaker Logic on page 98.
Parallel Switch Logic [GCP-21/22]
NOTE
This switch logic must be selected for the following operating modes: isolated operation, isolated op-
eration in parallel with other gensets and mains parallel operation.
In the event of a motor
request
• the GCB is synchronized and closed
• the required generator active load is adjusted
Following the with-
drawal of the motor
request
• the generator power is reduced
• the GCB is opened
• the genset is shut down after the coasting (cool down time)
[GCP-22]
The mains power cir-
cuit breaker is syn-
chronized and closed if
• terminal 53 "Release MCB" is energized
• GCB closed
NOTE
On bucking the unit (no F3 alarm), power reduction is carried out before opening the generator power
circuit breaker.
Interchange Switch Logic [GCP-22]
Interchange synchronization is activated via the "INTERCHANGE" screen input.
In the event of a motor
request, a switch is
made from mains to
generator supply. In
order to achieve this
• the GCB is synchronized and closed
• the mains reference power "zero" is correspondingly adjusted
• the MCB is opened
After the motor request
has been reset, a switch
is made from generator
to mains supply. In or-
der to achieve this
• the MCB is synchronized and closed
• the generator power "zero" is correspondingly adjusted (generator unloading)
• the GCB is opened

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English