Kohler 11RMY, Service Manual

Page: 47 / 98

TP-5867 11/02 37 Section 6 Component Testing and Adjustment
6.3.1 Voltage Regulator Test
If the regulator 10-amp fuse blows, the generator set
shuts down. Verify that the regulator fuse is good before
proceeding with the test. A failed voltage regulator can
cause either high voltage output or little or no voltage
output from the generator.
The voltage regulator test requires the following
components:
D
Variable transformer, 0--140 volts (0.5-amp
minimum)
D
Plug, 120 volt AC
D
Lamp, 120 volt, 100-watt
D
Voltmeter, AC
D
Copper Wire, #14 AWG, minimum
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
Moving rotor.
WARNING
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage . Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death.
Electrocution is possible
whenever electricity is present. Open the main circuit
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never
contact electrical leads or appliances when standing in water
or on wet ground because these conditions increase the risk of
electrocution.
Voltage Regulator Test Procedure
1. Connect the components as shown in Figure 6-5.
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
lamp should light. If the lamp does not light, turn the
voltage adjustment potentiometer clockwise (cw).
If the lamp still does not light, replace the voltage
regulator.
4. Slowly increase the voltage to 120 volts. The lamp
should go out and stay out as the voltage
increases. If the lamp stays lit, turn the voltage
adjustment potentiometer counterclockwise (ccw).
If the lamp does not go out, replace the voltage
regulator.
5. Turn the variable transformer to zero and unplug
the AC cord.
GY R Y O W BK
66 44 3
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55 -- +
1
2
3
4
5
6
7
TP563276
1. 120 volts AC
2. Variable transformer
3. AC voltmeter
4. Voltage regulator PowerBoost
ä
IIIE
5. Stator/rotor connections (for reference only)
6. Lead color
7. 120 volt, 100-watt lamp
Figure 6-5 Voltage Regulator Test Connections