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ELECTRONIC GOVERffOR
i
DESCRIPTION
The system is composed if three basic components.
1. Controller. The PC board that governs the system is
locat~d
in the control panel.
2. Sensor. Mounted on the flywheel cover, the sensor mea-
sures the speed of the eng\fle (via the ring gear).
3. Actuator. Electronically controls the carbnretor throttle.
The sensor and actuator are wired
thru
the wiring hamess to
the controller
board).
. CONTROL
PANEL
. (INTERIOR
VIEW)
~,<.u
(P2)
SPEED (P1)
ACTUATOR
FEEDBACK (P4)
,
C\
. ________ _
Following are'the basic procedures for adjusting the speed
(P1). stability (P2), gain
(P3),
and actuator feedback (P4)
pots ..
The adjusting pots (except speed) have physical internal
stops. Thrn to the right (clockwise) to increase, turn to the
left (counter-clockwise) to decrease.
Before starting the engine
• Remove all loads and turn off the AC circuit breaker
to insure that loads will not be subjected to voltage
variations while these adjustment are made.
• Decrease the speed pot to prevent overspeed at start up.
• Turn the other adjustment pots to the middle position.
Start the engine, monitor speed and adjust to the hertz rating
of the unit by adjusting the SPEED (P1) as needed. Verify
that the AC voltage output is in the correct range.
Decreasing the gain (P3) dampens no load hunting. With the
engine running at no load and proper speed, manually bump
the throttle lever to cause hunting.
If
necessary, decrease the
gain in small increments to eliminate hunting.
0.0301" (0.762mm)\
After the engine's no load speed and gain are set correctly,
SENSOR
ADJUSTMENT PROCEDURE
Speed. This adjustment is used to raise or lower the
engine's speed. This generator engine is set to run at
2200 RPM.
Gain. Adjusts the overall set of the engine.
If
too low, the
engine seems sluggish, to high causes the engine to hunt.
Stability. Adjusts the engine's response to generator load
changes.
Alternator Feedback. Adjusts the stability of the speed
signal to the throttle actuator.
NOTE:
These adjustments are extremely delicate and
require proper meters for measuring voltage and RPM·S.
the AC circuit breaker can be turned on and the ships load
applied. In the event of speed variations with loads applied,
the stability (P2) pot may need adjustment. This adjustment
also changes how the engine responds to generator load
changes.
If the range of adjustment of either gain (P3) or stability
(P2)
pots dopot correct engine hunting, the actuator feedback
(P4) potcan be increased. This adjustment dampens the sig-
nals to.the throttle contml actuator. lncreasing this adjustment
will decrease the amount of throttle control resolution.
Because of this, it is recommended the adjustment be made
in very small increments. The gain and stability pots may
now need to be readjusted.
Most hunting problems occur because of mechanical prob-
lems with the linkage between the actuator and the carbure-
tor. lnsure that the linkage is free of any debris or corrosion
and that it moves freely.
It
is reconuyended that the linkage
be lubricated with a graphite lubricant. Do not use oil
because it tends to collect
dirt
and dust.
NOTE:
Adjustments to one parameter may affect others.
such as speed. It may be necessary to readjust some pots
throughout this process.
'
Engines'&, Generators
24
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Table of Contents
Troubleshooting
