3.4 Fixed power
This regulation mode is typically used when the generator is running parallel to the mains. During fixed power
operation, the genset cannot change the frequency because it is maintained by the grid. If the fuel supply to
the engine is increased or decreased, the frequency of the genset does not change – only the load will in-
crease or decrease as a result of changed fuel supply.
Dependency
Fixed power mode is active when:
Input Active mode
Fixed power (w/sync.) Fixed power (de-load)
Control inputs Start sync./control 25 ON ON
De-load 43 OFF ON
Breaker feedbacks GB open 26 OFF OFF
GB closed 27 ON ON
Mode inputs Fixed P User def. ON ON
To activate the use of “Start sync./control” from M-Logic or external communication (for exam-
ple Modbus), the M-Logic command “Start sync./ctrl enable” must be activated. Alternatively,
you can use the functions “Remote GB ON” and “Remote GB OFF”.
Never mix the two control methods! If "Remote GB ON/OFF" control is used, you must uncon-
figure "Start sync./control", and vice versa.
Regulator
The power regulator is active in this mode. During fixed power operation, the set point is typically adjusted in
the display (menu 7051).
3.5 Frequency droop
This regulation mode can be used on various occasions where it is required that the generator frequency
drops with increasing load.
The governor droop has the purpose of applying stability in the regulation of the engine and
does not give an actual droop if a controller (GPC-3) is installed.
The GPC-3 droop has the purpose of causing an actual speed droop. With this droop activated,
the frequency will actually change with changing load.
GPC-3 DRH 4189340587 UK Functional descriptions
DEIF A/S Page 10 of 122
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