Operation & Maintenance Manual
Alternator Installation and Maintenance
92
22637300
WARNING
!
*During single-phase operation, check that the sensing wires from the
AVR are connected to the correct output terminals.
WARNING
!
** The AVR internal protection may cut in (overload lost connection, short
circuit).
Checking the winding
You can check the winding insulation by performing a high voltage test. In this case you must
disconnect all AVR wires.
During this procedure, make sure that the alternator is disconnected from any external load
and inspect the terminal box to check that the connections are fully tightened.
- Stop the unit, disconnect and disconnect the leads E+ (5+) and E- (6-) from the terminals
located on the side of the voltage regulator (AVR).
- Using jumper wires and a momentary normally open switch, connect the E+ (5+) lead to one
side of the switch and connect the other side of the switch to the positive (+) terminal of a 6
VDC dry cell battery. Then take the E- (6-) lead and ground it to the frame of the unit, and
ground the negative (-) terminal of the battery to the unit.
- Run the unit at its rated speed.
- Connect a voltmeter to the direct hookups and shut the output breaker and the momentarily
shut switch connected to the E+ (5+) lead and check the output voltage on the voltmeter. If the
output voltage of the alternator is greater than its normal value then the machine is in good
working order. The fault therefore comes from the AVR or its associated wiring(i.e. sensing,
auxiliary windings).
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