Regulation Modes; Fixed Frequency - Deif GPC-3 Designers Reference Handbook

GPC-3 DRH 4189340587 UK

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.
Application
Island mode, stand-alone
Island mode, load sharing with other gensets
Fixed power, for example to mains
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
Control inputs Start sync./control
De-load
Breaker feedbacks GB open
GB closed
Mode inputs Fixed frequency
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.
DEIF A/S
Mode selection Select regulation mode
Fixed frequency
χ
Fixed
frequency (sync.)
25 ON
43 OFF
26 ON
27 OFF
48 Mode inputs are not used when the GB is open
Functional descriptions
Fixed power Droop
χ
χ
χ χ
Fixed
frequency
ON
ON
ON
OFF
Load sharing
χ
Fixed
frequency
ON
OFF
OFF
ON
ON
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