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Bench Testing: Rotor

  1. Check rotor for open field windings by measuring resistance across slip rings. Rotor resistance should be 2.8-3.0 ohms. Check rotor for short circuit to ground by connecting ohmmeter between one slip ring and rotor shaft. Continuity should not exist.
  2. Check slip rings for wear or damage. Turn rotor/slip rings on lathe if necessary. Ensure minimum slip ring diameter is not less than .504" (12.8 mm). Check bearing and replace if necessary.
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