When the GB opens, there is a 10 s delay that prevents it from closing immediately after it has
opened. This is to ensure that there is sufficient time to change mode and control inputs.
GB OFF/open breaker
The GB can be opened instantly by the GPC-3. The sequence is started by this selection of the control in-
puts:
Terminal Description Input state
25 Start sync./control ON ON
43 De-load ON ON
48 Fixed frequency ON OFF
User def. Frequency droop OFF ON
The GB open signal will be issued immediately when the combination of the control inputs are as mentioned
in the table above.
GB OFF/de-load
The GB can be opened by the GPC-3 after a smooth de-load period where the load has decreased to the
breaker open point (menu 2622). The sequence is started by one of the following combinations of inputs:
Terminal Description Input state
25 Start sync./control ON ON
43 De-load ON ON
49 Load sharing ON OFF
User def. Fixed P OFF ON
The GB open signal will be issued when the load has been below the breaker open point for 1 second. In
order to interrupt the de-load sequence, the input 43 must be deactivated. Then the GPC-3 will continue the
operation according to the present mode selection. The de-load sequence can also be interrupted if the input
“Start sync./control” is deactivated. But then the entire regulation is deactivated.
Remote GB ON
The generator breaker ON sequence will be initiated and the breaker will synchronise if voltage and frequen-
cy at the BB are OK, or close without synchronising if the BB voltage is below 30 % × U
NOM
.
Remote GB OFF
The generator breaker OFF sequence will be initiated. Whether the breaker is de-loaded before opening de-
pends on the active regulation mode.
Mode De-load Comment
Fixed frequency No GB will be opened immediately
Frequency droop No
P load sharing Yes GB will be de-loaded to the GB open point (menu 2622)
In case de-load is not possible, the breaker will be opened when BB frequen-
cy has dropped to f
NOM
- 0.5 Hz
Fixed P Yes GB will be de-loaded to the GB open point (menu 2622)
GPC-3 DRH 4189340587 UK Functional descriptions
DEIF A/S Page 20 of 122
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