Kohler 11RMY, Service Manual

Page: 60 / 98

TP-5867 11/02 50 Section 6 Component Testing and Adjustment
in 1/8 turn increments until the engine operation
stabilizes.
9. Remove the load and observe the frequency. The
frequency should return to the value stated in
step 4. Gain adjustment may affect the generator
set speed/frequency.
If the frequency has
changed, repeat step 4.
Note: Speed adjustments have no effect on gain
adjustments. It is not necessary to repeat
the gain adjustments (steps 5 and 7) after
adjusting the engine speed.
10. Check the overspeed setting using the procedure
in the following section.
D-278670
1. Overspeed potentiometer (not used—use control board
potentiometer)
2. Gain potentiometer
3. Speed potentiometer
EG--1
U.S. PATENT 5,003,948
D--278670
R
GOVERNOR
ELECTRONIC
SPEED
OVER GAIN SPEED
1
2 3
Figure 6-21 Governor Adjustment Potentiometers
6.9.6 Overspeed Verification and
Adjustment
Check the overspeed setting when investigating a
shutdown problem. Also check it after adjusting the
speed or replacing the controller circuit board.
A potentiometer on the relay controller circuit board
adjusts the overspeed setting.
See Figure 4-6 or
Figure 4-7 to identify the potentiometer used to adjust
the overspeed setting.
Do not use the overspeed
potentiometer on the governor.
Perform the following procedure with the generator set
running.
Move the stepper motor linkage shown in
Figure 6-16 to increase the engine speed. Do not use
the speed adjustment potentiometer to increase the
engine speed.
Overspeed Verification and Adjustment Procedure
1. Carefully move the throttle shaft/governor stepper
motor linkage to raise the engine speed. Note the
frequency indicated by the meter when the
generator set shuts down. The factory setting is
120% of the rated speed/frequency (68--72 Hz for
60 Hz models and 58--62 Hz for 50 Hz models).
2. Turn the overspeed potentiometer on the controller
circuit board counterclockwise to increase the
overspeed cutout point or clockwise to decrease
the cutout point.
3. Repeat steps 1 and 2 as necessary to obtain the
desired overspeed cutout point.
4. Place the generator set master switch in the STOP
position.
If the generator set does not operate within the stated
specifications after the governor adjustment, repeat the
frequency and overspeed adjustment procedures. If
these adjustments fail to bring the generator set to
correct electronic governor specifications, replace the
governor controller circuit board.