Kohler 10EOZ, Manual

Page: 47 / 80

TP-6053 7/04 35 Section 7 Generator Troubleshooting
7.4.1 Voltage Regulator Test
When the frequency drops below 57.5/47.5 Hz, the AC
voltage should decline. Perform the following test to
check the regulator output.
Use the following components to test the voltage
regulator:
D
Variable transformer, 0--140 volts, 0.5-amp minimum
D
Plug, 120 volts AC
D
Lamp, 120 volt, 100 watt
D
AC voltmeter
D
Insulated copper wire, #14 AWG, minimum
Regulator Test Procedure
1. Connect the components as shown in Figure 7-4.
2. Turn the variable transformer setting to zero. Plug
in the variable transformer.
3. Turn the variable transformer on. Slowly increase
the variable transformer voltage to 100 volts. The
test lamp should light. If the lamp does not light,
turn the voltage adjustment potentiometer (pot)
clockwise.
If the lamp still does not light, the
voltage regulator is inoperative. Replace the
voltage regulator. An inoperative voltage regulator
causes a generator no/low-output condition.
4. Slowly increase the voltage to 120 volts. The lamp
should go out and stay out as the voltage
increases. If the lamp remains lit, turn the voltage
adjustment pot counterclockwise. If the lamp still
remains lit, replace the voltage regulator.
An
inoperative voltage regulator causes a generator
high voltage output condition.
5. Turn the variable transformer to zero and unplug
the AC cord.
Note: For applications requiring fine voltage
adjustment, connect a remote rheostat to
voltage regulator terminal 66.
GY R Y O W BK
66 4433 55 -- +
1 2 3
4
5
6
7
TP-598654
1. 120 volts AC
2. Variable transformer
3. AC voltmeter
4. Voltage regulator PowerBoost
t
IIIE
5. Stator/rotor connections (for reference only)
6. Lead color
7. 120 volt, 100 watt lamp
Figure 7-4 PowerBoost
t
IIIE Voltage Regulator Test
7.4.2 Voltage Regulator Adjustment
Kohler Co. sets the voltage regulator and, under normal
circumstances, the regulator requires no further
adjustment. However, if the voltage regulator has been
replaced or tampered with, or if voltage/frequency
reconnection has been done, readjust the voltage
regulator according to the following procedure. The
following paragraphs describe the voltage regulator
components.
Voltage Adjustment Pot adjusts the generator output
within the range of 100--130 volts.
Stabilizer Pot fine-tunes regulator circuitry to reduce
light flicker.
Volts/Hz Pot adjustment determines the engine speed
(Hz) at which the generator output voltage begins to
drop.
Note: The volts/Hz adjustment does not apply to the
following models: 4/6.5/8/9EFOZ and
5/8/9/10EOZ. On these models, turn the volts/Hz
adjustment pot full counterclockwise to stop and
seal.
No further volts/Hz adjustments are
required.