Powerboostt Iiie Voltage Regulators; Voltage Regulator Test - Kohler 5ERKM Service Manual

5.2 PowerBoostä ä ä ä IIIE Voltage
Regulators
The generator set is equipped with a PowerBoostt IIIE
voltage regulator. See Figure 5-3.
The voltage regulator monitors the output voltage of the
generator set.
The 10-amp regulator fuse protects the alternator stator
windings (power supply) 55--33 from excessive current
draw because of an inoperative voltage regulator or a
downstream short. If the regulator's 10-amp fuse blows,
the generator set will shut down. Verify that the regulator
fuse is functional before proceeding with the test.
1. Voltage potentiometer
2. Stability potentiometer
3. Volts/Hz potentiometer
Figure 5-3 PowerBoostt IIIE Voltage Regulator
5.2.1

Voltage Regulator Test

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 volts, 100 watts
D
AC voltmeter
D
Insulated copper wire, #14 AWG, minimum
TP-6079 3/00
1 2 3
TP-598653
Regulator Test Procedure:
1. Connect the components as shown in Figure 5-4.
2. Turn the variable transformer setting to zero. Plug
in the variable transformer.
3. Turn the variable transformer on. Slowly increase
the variable transformer 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 variable transformer 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.
A voltage regulator that is inoperative 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.
1 2 3
1. 120 volts AC
2. Variable transformer
3. AC voltmeter
4. Voltage regulator PowerBoosttIIIE
5. Stator/rotor connections (for reference only)
6. Lead color
7. 120-volt, 100-watt lamp
Figure 5-4 PowerBoosttIIIE Voltage
Regulator Test
Section 5 Generator Troubleshooting
4
5
66 44 33 55 -- +
GY R Y O W BK
6
7
TP-598654
17