Rotor Open Or Short Test
- Adjust ohmmeter to x1 scale. Place each ohmmeter lead on rotor slip rings. See Fig 1 . Note ohmmeter reading. Reading should be 2.0-3.9 ohms.
- Reading exceeding specification indicates a damaged slip ring, welded connection or a broken wire. Low reading indicates a shorted wire or slip ring.
- Place one ohmmeter lead to a slip ring and remaining lead on rotor shaft. No reading should be obtained. Rotor coil is grounded to shaft if reading is obtained. Repair or replace rotor if defective.