Troubleshooting Voltage Issues GPS 8500/GPS 9700
wc_tx000828gb.fm 20
3.3 Checking the Automatic Voltage Regulator (AVR)
Prerequisites
Generator shut down
Multimeter
Procedure
Follow the procedure below to check the Automatic Voltage Regulator (AVR).
1. Shut down the generator.
2. Disconnect all loads from the generator.
3. Place the auto idle switch in the OFF position.
4. Remove the rear panel (a) from the generator.
5. Disconnect the F1 (+) and F2 (-) wires and the L1 and L2 wires from the
Automatic Voltage Regulator (AVR) (b).
6. Start the engine.
7. Check the engine rpm. It should be approximately 3750 rpm.
8. Measure the voltage between the L1 wire and the L2 wire.
Is 120–160 VAC measured?
The AVR has now been checked. Continue with checking the stator windings.
WARNING
Electric shock hazard. High voltage exists at the L1 and L2 wires. Electric shock
can cause severe injury or death.
f Never touch the L1 and L2 wires while the engine is running.
Yes ____ No ____
The AVR has failed; replace it. No judgement can be made on the AVR.
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