Stator Voltage Test Procedure - Lincoln Electric Fleet 650 Service Manual

LINCOLN ELECTRIC

STATOR VOLTAGE TEST PROCEDURE

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will determine if the Stator is able to produce the correct voltage from its Windings. It will only
yield meaningful data if the engine idle speed is correct (1890 RPM) and approximately 160 VDC is present
across the Rotor Slip Rings.
MATERIALS NEEDED
Volt/Ohmmeter
Wiring Diagram
TEST PROCEDURE
1. Turn off the engine on the Fleet 650 machine.
2. Perform the Case Cover Removal Procedure.
3. Perform the Chopper Module Capacitor Discharge Procedure.
NOTE: Voltage tests of the 120 and 240 VAC receptacles can be performed by placing the meter
probes directly into the appropriate connection slots in the front of the receptacles rather than
testing at the lead connections described below. If the meter probes are not long enough to make
contact with the conductors inside the receptacles, test pins may be used.
4. Start the engine and allow it to stabilize.
5. Check for the correct AC voltages at each of the 120 and 240 VAC receptacles. See Figure F.10. See
Wiring Diagram.
6. Turn off the engine on the Fleet 650 machine.
7. If these voltage readings are not within the specified limits, check for tripped or defective circuit
breakers, loose connections or broken wires between the test points and the stator windings. If
there are no wiring problems and the circuit breakers are not tripped or defective, the stator is
defective and should be replaced.
To test the three-phase weld winding:
8. Locate the weld winding leads W1/W6, W2/W3 and W4/W5 where they connect to the output
rectifier bridge. See Figure F.11. See Wiring Diagram.
9. Start the engine and allow it to stabilize (1890 RPM).
10. Check for about 60 to 65 VAC from leads W1/W6 to W2/W3, W2/W3 to W4/W5 and W4/W5 to
W1/W6. See Wiring Diagram.
11. Turn off the engine on the Fleet 650 machine.
Fleet™ 650 Service Manual
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