Electronic Governor (Adjustments) - Westerbeke 11.5KW-60Hz Service Manual

ELECTRONIC GOVERNOR
(OPTIONAL)
DESCRIPTION
The system is composed of three basic components:
1. Controller. A solid state component mounted in the
control box on the generator ..
2. MPU
(Speed Sensor). Installed on the bellhousing over
the flywheel ring gear teeth.
3.
Linear Actuator. Threaded into the engine block just
behind and below the fuel iniection pump
,
CONTROLLER
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(12 AND 24 VDC)
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CONTROLLER ADJUSTMENT
LINEAR
ACTUATDR~::;:;~:72:~V
1.
Speed. This adjustment is used to raise or lower the
engine's speed to the desired hertz.
2. Gain. This adjustment affects the reaction time of the
actuator to the generatorlengine load changes.
NOTE:
A high gain adjustment can induce an oscillating
of the actuator producing a hunting mode. In such
cases,lessen the gain adjustment.
Calibration
1.
With no power to the governor, adjust the GAIN to
9:00
o'clock.
2. Start the engine and adjust the speed by either turning the
speed potentiometer clockwise or depress and hold the
INC (increase) pad until the desire speed is obtained.
NOTE:
C;ontrollers are factory adjusted to minimum rpm.
However. for safety, one should be capable of disabling
the engine
if
an overspeed should exist.
3. At no:;lpad, turn the GAIN potentiometer clockwise until
the engine begins to hunt. if the engine does not hunt,
physically upset the governor linkage.
4. Tum the GAIN potentiometer counterclockwise
until stable.
NOTE:
The controller operates on 12VDC. The voltage
rang';s ± 20% (9.6VDC 12VDC 14.4VDC}.lfvaltage
varies above or below these ranges, the controller will
not operate and the engine will run in an idle mode until
proper voltage
is
supplied to the controller.
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REFER TO WIRING DIAGRAM
INSPECTION AND ADJUSTMENT
J
leGOVElINOR
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The system has two styles of electronic controllers. The
early version (black encapsulated components) with 2
adjustments, a speed potentiometer and a GAIN adjust·
ment. This controller is NLA. The current electronic
controller (aluminum housing with components inside) has
two push pads for speed adjustment. One pad to increase
speed (INC) and one pad to decrease speed (DEC). It also
has the GAIN adjustment,
These two electronic controllers are illustrated on this
page. When you press the preheat button, DC voltage is
sent to the controller to function with.
The engine is started, the new controller will operate the
engine in the
800-1000
range. Adjust the engine speed by
depressing and holding the INC pad until the speed reaches
the desired rpm (hertz) as possible.
The GAIN adjustment has been discussed earlier under
CALIBRATION. Place an amperage load on the generator
and note its reaction to the load. If the system is slow to
react and maintain the set speed, adjust the GAIN slightly
higher. The electronic governor system will maintain a set
speed at
+
or -
0.5
hertz from no amperage load to full
rated amperage load for the generator.
NOTE:
When stopping the unit, the engine only goes to a low
idle and does not shut down fully, the actuator will need a
slight adjustment to provide complete stopping of the unit.
Thread the actuator in 114 turn- 112 turn until complete
stopping of the engine
is
obtaineq..",
fED IINDI!:'TO. LIGHT
CONTROLLER
ADJUSTMENT
-..v-
WESTERBEKE
Engines & Generators
92