Voltage Regulator Test - Kohler 13EOZ Service Manual

7.5 Voltage Regulator Test

The following components will be needed to test the
voltage regulator:
D
Step-up transformer, 1:2, 120--240 volts
(1.0 amp min.)
D
Variable transformer, 0--140 volts (1.0 amp min.)
D
250-volt, 100-watt lamp
D
AC voltmeter, 250-volt minimum
D
1-amp fuse
D
1 single-pole single-throw (SPST) switch, 1 amp
(minimum)
D
120-volt AC plug (200--240-volt AC plug optional)
D
#14 AWG copper wire (minimum)
WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
are in place.
High voltage test. Hazardous voltage can cause severe
injury or death. Follow the instructions of the test equipment
manufacturer when performing high-voltage tests on the rotor
or stator. An improper test procedure can damage equipment
or lead to generator set failure.
Voltage Regulator Test Procedure:
1. Connect components as shown in Figure 7-4.
2. If plug (item 10) is 250 volts, use 250 volt lamp. If
plug is 120 volts, use 120 volt lamp.
3. Turn the volts potentiometer (pot) fully clockwise.
4. Set the variac to zero or minimum volt.
5. Plug the power cord into outlet.
6. Turn the power variac on. The AC voltmeter should
indicate a power supply voltage of zero volts. The
lamp should be off.
TP-6071 3/00
Moving rotor.
7. Slowly increase the variac. The light should begin
to illuminate at approximately 90 volts.
8. Adjust the variac to 240 volts. Do not exceed 300
volts. The lamp should illuminate brightly. Replace
the voltage regulator if the lamp does not light.
9. Turn volts pot fully counterclockwise. The lamp
should go out. If it remains lit, the voltage regulator
is inoperative.
10. Turn the volts pot clockwise. The lamp should be
lit.
11. Turn power supply off and disconnect power cord.
12. See Voltage Regulator Adjustment Procedure.
Output
Input
4
"RED"
"GREEN"
STAB
V/HZ VOLTS
Sensing
"YELLOW"
11
12
7
8
10
9
1. Voltage regulator PowerBoostä V
2. 250 volt, 75-100-watt lamp
3. AC voltmeter, 250 volt (minimum)
4. Volts potentiometer
5. 1:2 step-up transformer
6. Single-pole single-throw switch
7. 1-amp fuse
8. Black wire
9. White wire
10. 250 vac
11. Variable transformer (variac)
12. 120 vac
Figure 7-4 PowerBoostt V Voltage
Regulator Test
Section 7 Generator Troubleshooting
1
2
8
7
6
5
4
3
2
1
V8
3
V7
5
6
55
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