Kohler 40COZ/33CFOZ Service Manual page 93

Preliminary Adjustment Procedure
1. Place the generator set master switch in the OFF
position. Do not run the generator set.
2. Set the control unit "I" adjustment one division from
zero, the "D" adjustment four divisions from zero,
and the gain adjustment at the third division from
zero.
3. For isochronous operation, turn the droop
adjustment potentiometer
(CCW) to the minimum position.
operation, turn the droop potentiometer to the
desired droop.
necessary with parallel generator operation.
Note: If the governor uses the full stroke of the
actuator shaft and the linkage adjustment
uses only the active fuel range, the
maximum obtainable droop would be
approximately 12% at full load.
4. Position the actuator lever to hold the fuel pump
lever in the STOP position when the power is off.
Adjust the actuator linkage for smooth, non-binding
operation.
Final Adjustment Procedure
1. Place the generator set master switch in the RUN
or TEST position to start the generator set.
2. Adjust the control unit speed potentiometer until
the engine operates at the desired rpm (50 or
60 Hz on the frequency meter).
3. If governing is unstable, turn the "I" and gain
potentiometers slightly CCW.
Note: Except for the speed potentiometer, control
unit potentiometers have internal stops at 0
and 100%.
TP-5737 5/01
counterclockwise
For droop
Droop adjustment may be
4. With the engine running at no load, finalize the "I",
"D", and gain adjustments.
5. Slowly turn the gain adjustment potentiometer
clockwise (CW) until the output shaft and linkage
oscillates. Slowly turn the gain adjustment
potentiometer CCW until the actuator lever
stabilizes.
6. Jog the actuator lever by hand. If the actuator lever
oscillates three to five times and then stabilizes, the
gain setting is correct.
7. Turn the gain potentiometer one division CCW.
8. Turn the "D" adjustment fully CW while observing
the actuator shaft. If the lever does not become
unstable, jog it by hand. When the lever oscillates,
turn the "D" adjustment CCW slowly until the
actuator shaft stabilizes. Jog the lever again, it
should oscillate 3--5 times and then become stable.
If the system response to load changes is
satisfactory at this point, omit step 9 and proceed to
step 10.
9. Turn the "I" potentiometer fully CW and watch the
actuator shaft. If the actuator lever does not
become unstable, jog it by hand.
actuator lever slowly oscillates, slowly turn the "I"
potentiometer CCW until the lever stabilizes.
10. Jog the actuator lever by hand. It should oscillate
3--5 times before stabilizing. The governor is now
calibrated.
11. Stop the generator set.
Section 7 Component Testing and Adjustment
When the
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