TP-5986 4/03
27
Section 7 Generator Troubleshooting
7.2 PowerBoost
t
IIIE Voltage
Regulators
The generator set is equipped with a PowerBoost
t
IIIE
voltage regulator. See Figure 7-3.
TP-598653
1
3
2
1. Voltage adjustment potentiometer
2. Stability adjustment potentiometer
3. Volts/Hz adjustment potentiometer
Figure 7-3
PowerBoost
t
IIIE Voltage Regulator
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.
7.2.1
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
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. A voltage
regulator which tests bad 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
Summary of Contents for 4EF
Page 1: ...Marine Generator Sets Models 5E 4EF 7 3E 6EF TP 5986 4 03b Service ...
Page 4: ......
Page 10: ...VI Safety Precautions and Instructions TP 5986 4 03 Notes ...
Page 14: ...TP 5986 4 03 iv Introduction Notes ...
Page 18: ...TP 5986 4 03 4 Section 1 Specifications Notes ...
Page 20: ...TP 5986 4 03 6 Section 2 Scheduled Maintenance Notes ...
Page 22: ...TP 5986 4 03 8 Section 3 Intake and Exhaust System Notes ...
Page 26: ...TP 5986 4 03 12 Section 4 Fuel System Notes ...
Page 46: ...TP 5986 4 03 32 Section 7 Generator Troubleshooting Notes ...
Page 54: ...TP 5986 4 03 40 Section 9 Generator Disassembly Reassembly Notes ...
Page 60: ...TP 5986 4 03 46 Section 10 Wiring Diagrams and Voltage Reconnection Notes ...
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Page 70: ......
Page 71: ......