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.
In case the busbar frequency drops more than the setting in menu 2623 during de-load, the GB
will be opened regardless of the setting in menu 2622 (Breaker open point).
Regulator
The power and the frequency regulators are active when the load sharing mode is selected. The set point is
typically a combination of the signal on the load sharing line and the nominal frequency.
For a detailed description of the load sharing principle, refer to the chapter “Load sharing”.
Analogue load sharing: When a unit is running alone on the busbar, the regulation mode
should be changed to fixed frequency.
Governor mode undefined (menu 2730)
After the breaker has been closed, it is required that one regulation mode is selected. In case no mode is
selected or more than one mode is selected, the following action will be performed regardless of the fail class
selected for “GOV mode undef.” in 2730:
1. No mode input active: The unit is changed to manual mode (regulator OFF), and a “GOV mode undef.”
alarm is raised after the delay has expired.
2. More than one mode input active: The unit is maintained in the first selected running mode and the “GOV
mode undef.” alarm is raised.
3.7 Measurement systems
The GPC is designed for measurement of voltages between 100 and 690 V AC on the terminals. If the volt-
age is higher, voltage transformers are required. For further reference, the AC wiring diagrams are shown in
the Installation Instructions.
In menu 9130, the measurement principle can be changed; the options are three-phase, single phase and
split phase.
Configure the GPC to match the correct measuring system. When in doubt, contact the switch-
board manufacturer for information about the required adjustment.
3.7.1 Three-phase system
When the GPC is delivered from the factory, the three-phase system is selected. When this principle is used,
all three phases must be connected to the GPC.
The table below contains the parameters to make the system ready for split phase measuring.
GPC-3 DRH 4189340587 UK
Functional descriptions
DEIF A/S
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