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Rotor Test

  1. Test rotor for grounded, open or shorted field coils using an ohmmeter. Test for grounds between slip rings and rotor shaft. No continuity should exist. Check for an open field by connecting ohmmeter across slip rings.
  2. Ohmmeter reading should be 1.7-2.1 ohms (100 amp.) or 1.5-2.0 ohms (all others) with rotor at room temperature. Slightly higher readings will be found for rotors that are still warm from operation.
  3. Readings above 3.5 ohms indicate high resistance and may require rotor replacement. Readings below 1.7 ohms (100 amp.) or 1.5 ohms (all others) indicate field coil is shorted.
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