Operating instructions

TROUBLESHOOTING THE ELECTRONIC GOVERNOR
PROBLEM TEST/CHECK CDRRECnDN
Unit starts, then overspeeds 1. Check DC voltage between terminal
1. Charge starting battery. Start unit, troubleshoot
and shuts down. #12 and + connection on hourmeter
battery, charge circuit.
when ON switch is depressed.
NOTE: When troubleshooting,
manually operate the throttle to
prevent an overspeed or disconnect
the throttle from the actuator and
operate manually.
2. Check the AC signal from the MPU 2. Check the MPU resistance value and positioning.
while cranking, voltage should be
Adjust and replace as needed.
1.5 • 2.5 VAC.
3. Check the actuator.
3. Check the resistance value. Apply 12VOC across leds.
Should fully retract. Replace as needed.
4. Check the controller. 4. Manually control unit. Start and check DC voltage
between #9 and #8, between '11 and 110.
Replace controller or OS board as needed.
Unit starts, runs at idle.
1. Incorrect speed adjustments .. 1. Check and adjust speed adjustment.
NOTE: Less than one volt DC
2. Faulty governor controller..
2. Check DC voltages from controller to OIS board
found between terminals 19 and
and OIS board to actuator.
18 and high DC voltage-10 volts
or higher between terminals 111
and 110 indicated a faulty controller.
Actuator hunts during operation.
1. Improper controller adjustment.
1. Lessen GAIN adjustment.
NOTE: Check carburetor
adjustments before proceeding.
2. Linkage or rod end bearings are
2. lubricate and replace as needed.
sticking or binding.
3. Inadequate DC supply voltage.
3. Manually stabilize the unit. Check the DC voltage
to the controller. Correct as needed.
4. MPU positioned marginally
4. Check the MPU signal. Adjust pOSitioning
too far away from the flywheel
as needed.
teeth, giving an erratic AC input
signal to the controller.
Engines & Generators
20