Troubleshooting GP Repair
wc_tx000548gb.fm 94
6.18 Confirming a Malfunctioning AVR
See Graphic: wc_gr003152
By removing the two sensing wires of the regulator and measuring the
output voltage of the generator, you can determine if the generator
windings and the AVR are functioning correctly. When the sensing
wires are removed from the circuit, the generator should produce high
voltage (greater than 150V, usually around 180V). If this high voltage
is still produced with the AVR’s sensing wires connected, the AVR is
malfunctioning. To check the AVR, carry out the following procedures:
6.18.1 Stop the engine.
6.18.2 Place the auto idle switch in the OFF position.
6.18.3 Remove the two screws which secure the end cover to the generator
and remove the end cover.
6.18.4 The two sensing wires are the brown and blue wires that share the
same connector (a) as the wires for the DC winding; disconnect this
connector.
6.18.5 Create two short jumper wires (b and c) each with one male spade and
one female spade. Connect the jumpers between the yellow wires of
the plug and where the yellow wires connect to the stator.
CAUTION: Be sure to connect the jumper wires correctly. Damage to
the generator may occur if the wires are incorrectly connected.
6.18.6 Start the engine and check the voltage at the terminal strip between
the wire with the yellow marking and the wire with the red marking.
There should be approximately 180V. Also check between the wire
with the green marking and the wire with the black marking. There
should be approximately 180V.
• If approximately 180V is not measured, the generator windings
may be bad. See section Checking Main and Rotor Windings.
• If approximately 180V is measured, the generator windings are
functioning properly, but the AVR is not. Replace the AVR.
To Next Page
Loading...
Need help?
General
