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Bench Tests: Rotor

  1. Using an ohmmeter, check rotor windings for grounds, by setting it on x1000 scale. See Fig 1. Connect one ohmmeter lead to rotor shaft and other lead to each slip ring. Resistance should be very high (infinity). If resistance is not infinity, replace rotor assembly.
    Fig 1: Bench Testing Rotor for Grounds and Opens
    G3503
  2. Set ohmmeter on x1 scale and test rotor for opens. Connect an ohmmeter lead to each slip ring See Fig 1. The resistance reading should be 2.4-3.5 ohms. If resistance is not as specified, replace rotor assembly.
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