3.2 Regulation modes
The unit can, for example, be used for the applications listed in the table below. This depends on the selec-
tion of the running modes.
Mode selection Select regulation mode
Application Fixed frequency Fixed power Droop Load sharing
Island mode, stand-alone χ χ
Island mode, load sharing with other gensets χ χ
Fixed power, for example to mains χ χ
Regulation modes can be selected via digital inputs, M-Logic or the external communication
protocols.
3.3 Fixed frequency
This regulation mode is typically used when the generator is running in island operation/stand-alone. During
island operation/stand-alone, the load connected to the generator cannot be changed through regulation of
the genset. If the fuel supply to the engine is increased or decreased, the loading of the genset does not
change – only the frequency will increase or decrease as a result of changed fuel supply.
Dependency
Fixed frequency mode is active when:
Input\Active mode Fixed
frequency (sync.)
Fixed
frequency
Fixed
frequency
Control inputs Start sync./control 25 ON ON ON
De-load 43 OFF ON OFF
Breaker feedbacks GB open 26 ON ON OFF
GB closed 27 OFF OFF ON
Mode inputs Fixed frequency 48 Mode inputs are not used when the GB is open 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 frequency regulator is active in this mode. During fixed frequency operation, the set point is typically the
nominal frequency.
GPC-3 DRH 4189340587 UK
Functional descriptions
DEIF A/S Page 9 of 122
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