Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
Page 50/190 © Woodward
Emergency Power [GCP-20/22]
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Prerequisite
The emergency power function can only be activated for synchronous generators by means
of the screen "emergency power operation ON". Emergency power is carried out in
"AUTOMATIC" or "TEST" operating mode regardless of the status of the discrete inputs
"Automatic 1" and "Automatic 2".
NOTE
If the "Motor release" function is assigned to terminal 6, emergency power can be digitally prevented or
interrupted from an external source.
Activation of the emer-
gency power operation
If an alarm occurs at least at one of the terminals 50, 51 or 52 during the activation of the in-
put mask "emergency power delay time ON" the emergency power is activated. A mains
voltage alarm is defined as follows: If the mains watchdogs are switched on, the limit values
set there are used; otherwise, the limits are internally defined as follows:
Mains watchdogs Voltage Frequency
ON Monitor values Monitor values
OFF
V
mains
< 85 % V
rated
V
mains
> 112 % V
rated
f
mains
< 90 % f
rated
f
mains
> 110 % f
rated
Table 7-4: Mains watchdogs
Emergency power is also triggered via the detection of a switch alarm when the MCB is
switched on. For the triggering to occur, the screens "emergency power" (page
109) and
"Monitoring MCB" must be set to "ON".
As a rule, the network screens apply for the GCP-20, since in this case, the mains watchdogs
cannot be switched off.
The following principles apply for the emergency power operation:
• If an emergency power operation is triggered, the genset is started in any case unless the
process is interrupted by an alarm or by changing the operation mode.
• If the mains returns during the starting process, the MCB is not opened. The unit starts
under all circumstances, and waits without load until the mains settling time has expired.
If a further mains alarm occurs during this time, the MCB is opened, and the GCB is
switched to the black busbar. The unit otherwise shuts off following the expiry of the
mains settling time.
• After reaching the dead bus operation limits, the GCB is always closed, independent of
the motor delay time.
• If the mains returns during the emergency power operation (GCB closed) the mains set-
tling time is first finished before re-synchronizing the MCB.
Emergency power op-
eration
In the case of an active emergency power operation the message "emergency" is displayed.

Woodward GCP-20 Series Specifications

General

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