Checking Frame And Field Assembly

The frame, field and brush assembly can be checked for open or grounded circuit using a test lamp. To test for open circuit, place one prod of test lamp on terminal screw (9) and other prod on insulated brush (20). If test lamp fails to light, an open circuit is indicated. A grounded field circuit is located by placing one test prod on each insulated brush (20) or on the terminal (9) and the other test prod on the frame (6), malting certain contact is made with the metal surface. The lamp will light if the circuit is grounded, Each insulated brush holder should be checked with the test lamp to make certain it is insulated from the frame.

There is no satisfactory field test for shorted field coils, and if this condition is suspected, the field coil assembly should be replaced and the motor retested to see if performance improves.

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