Lincoln Electric SVM204-A Slip Rings Brushes, Rotor Resistance and Ground Test Static

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F-30 TROUBLESHOOTING AND REPAIR F-30

ROTOR RESISTANCE AND GROUND TEST (STATIC) (continued)

FIGURE F.10 – ROTOR RESISTANCE

SLIP RINGS

BRUSHES

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PROCEDURE

1.Turn the engine off.

2.Remove the plastic cover from the end of the generator. See Brush and Slip Ring Service Procedure.

3.Using needle-nose pliers, remove the leads from the brush terminals. This will electrically isolate the rotor windings.

4.Remove the brush and brush holder assembly. See Brush and Slip Ring Service Procedure.

5.Using the ohmmeter, check the rotor winding resistance across the slip rings. Normal resis- tance is approximately 9* ohms, at 77°F. (25°C.)

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6.Measure the resistance to ground. Place one meter probe on either of the slip rings. Place the other probe on any good, unpainted chassis ground. The resistance should be very high, at least 500,000 (500k) ohms.

7.If the test does not meet the resistance specifi- cations, then the rotor may be faulty and should be replaced.

8.If this test meets resistance specifications, con- tinue testing using the Dynamic Rotor Resistance and Ground Test.

*Voltage shown is for a stator that is at normal full load temperature. Readings will likely be slightly higher if machine is cold.

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