DKG-255 User Manual Firmware V-1.0
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The typical operation mode of the unit is isochronous (constant speed). However, a droop operation may be
required for load sharing purposes on genset engines.
In droop operation, the engine speed will decrease slightly with load increase. The load information is picked
up from the actuator current, which increases together with the load.
The droop operation is selected by connecting the terminal
K
to battery negative. The amount of droop is
adjusted by
P_19 Droop Gain
parameter.
The droop range will be different for each engine-actuator combination. For a current increase of 1 Amperes,
the droop range is adjustable within 1 to 5 % of the nominal speed.
As the actuator current is not zero at no-load condition, this will cause a droop even if the engine runs without
load. Thus the droop adjustment modifies the nominal speed setting.
The unit offers the possibility of Idle/Nominal speed switching using an external switch. The idle speed is
independently adjustable from
P_02 Idle Speed
parameter.
The idle speed is selected by connecting the terminal
L
to battery negative.
Switching between idle and nominal speeds can be done while the engine is running.
An external speed adjustment potentiometer can be connected between terminals
G, H
and
J
. The
potentiometer value should decrease with a clockwise rotation (speed increase).
The recommended potentiometer value is 5 K-ohms. A different value may also be used for an exact match
of the desired adjustment range.
The external adjustment cable should be shielded for the best operation. The cable should be shielded at one
end only.
Speed control with external potentiometer must be enabled from
P_20 Trim Enable
parameter.
External speed adjustment signal from other control devices may be applied between terminal
M
and battery
negative.
The input accepts 0 to 10V DC signals.
The remote speed adjustment cable should be shielded for the best operation. The cable should be shielded
at one end only.
This feature must be enabled from
P_17 Aux Enable
parameter.
It is necessary to readjust the no-load speed after droop adjustment.
9.4. Speed Adjustment for Automatic Synchronization
9.3. External Speed Adjustment
9.2. Idle Speed Selection
9.1. Isochronous and Droop Operation
9. OTHER FEATURES
