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EG3002F
5
SECTION 6 : ADJUSTMENT
6.1
Initial Settings Before Trial Run
6.1.1 With the engine OFF toggle the actuator linkage
back and forth. The movement should be smooth
with no gap in the linkage connection to the
actuator. If there is a gap it will make it difficult to
achieve stable settings.
6.1.2 Frequency Range Selection
Frequency range is selected according to the
frequency of the signal sent by the magnetic
pickup (MPU) at desired operating speed.
MPU frequency =
RPM
×
Flywheel teeth
60 seconds
Frequency Range Selection
SW-1 ON
600
1200 Hz
SW-2 ON
1200
2500 Hz
SW-3 ON
2500
5000 Hz
SW-4 ON
5000
9500 Hz
NOTICE
Only one DIP SW 1
– 4 can be turned ON.
If the number of flywheel teeth is not known then test
each setting one by one from lowest (SW-2) to highest
(SW-4).
6.1.3 Moving SW-5 to ON decreases the gain of the
controller for use with Cummins PT-PUMP type
or low-impedance, built-in actuators.
6.1.4 VR Settings
Run Speed
：
Turn counterclockwise to minimum.
IDLE Speed
：
Turn clockwise to maximum (If
Cummins PT-PUMP type adjust counterclockwise
to minimum).
Set all other values according to diagram below :
DROOP
DIF.
INT.
GAIN
RAMP
SW
If an external VR is used then adjust to a middle
position.
Open the IDLE switch between terminals 2 & 3.
NOTICE
RUN SPEED and IDLE SPEED VR are 25 turn
precision potentiometers. When adjusted past
minimal or maximum will begin to make a
clicking sound but will not be damaged.
6.2
Trial Run
6.2.1 Engine will not start
Refer to Section 7.1 Troubleshooting below for
possible causes. If the engine still will not start
normally then increase
Run Speed
setting or
Frequency Range SW setting to a higher range
(
Run Speed
should be set to minimum at this
time)
6.2.2 If engine starts normally then slowly adjust
Run
Speed
to the target speed. If unable to adjust to
the target speed then set Frequency Range SW
to next higher level. (
Run Speed
should be set to
minimum at this time)
6.2.3 If the engine goes directly to over speed after
starting then adjust the Frequency Range SW to
the next lower level.
NOTICE
When conducting a trial run it is possible the
engine speed cannot be controlled. Therefore, it
is recommended to install an additional device to
shutdown the engine, such as a fuel valve switch.
6.3
IDLE Speed and Ramp Time Settings
6.3.1 With the engine running at operating speed short
Terminals 2 and 3. Engine speed will drop to
IDLE speed at this time.
6.3.2 Adjust
IDLE Speed
counterclockwise to the
desired IDLE level.
6.3.3 RAMP time too long it could cause the GCU to
activate the under speed protection function.
RAMP time too short could lead to incomplete
combustion of fuel.
6.3.4 Open the connection between Terminals 2 & 3.
Engine speed will climb from IDLE speed to
operating speed. If RAMP time is inappropriate
then short Terminals 2 & 3 again and adjust the
RAMP
. Repeat this step until setting is
appropriate.
6.3.5 Stop the engine then start again. If the engine will
not start then adjust the
IDLE Speed
clockwise to
increase the IDLE setting.
