Output Voltage Troubleshooting Mobile Generator
wc_tx000726gb.fm 76
8.8 Flashing the Generator (checking the excitation system)
Prerequisites Source of 12VDC
Procedure Follow the procedure below to flash the generator.
1. Open the large hinged panel and locate the Automatic Voltage Regulator (AVR).
2. Disconnect all the wires from the AVR except the rheostat wires and the white jumper
wire.
3. Connect a multimeter (set to the 500VAC or higher scale) to the green and black wires.
WARNING! Electric shock hazard. High voltage exists between the green and black wires
when the engine is running. Electric shock can cause injury or death. Do not touch the
green and black wires.
4. Start the engine. Then, connect the blue wire to the ground lug and the yellow wire to
the B+ terminal strip. NOTICE: Do not connect the wires to the machine without the
engine running. Damage to the winding may occur.
5. Check the multimeter for the voltage measured across the green and black wires.
Is 320±50V measured? (170±25V on: 0009369 rev. 100-105, 0009459 rev. 100-105,
0620003 rev. 100-106)
6. Shut down the generator. Then, reconnect all the wires to the AVR.
7. Start the engine and check the function of the generator.
Does the generator now function properly?
The excitation system has now been checked. Continue with Checking the Stator Windings
at the Lugs.
Yes____ No____ Your reading
The excitation system is
functioning properly.
Continue
Check the exciter rotor win-
ding. See Checking the
Exciter Rotor Winding.
Yes____ No____
The generator should be OK. The AVR has failed; replace it.
1000
200
20
2
200m
F
V
A
V- COM
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