Bench Testing: Rotor
Connect ohmmeter leads to each of the rotor slip rings. If continuity is present, rotor is okay. If continuity is NOT present, replace rotor. Connect an ohmmeter lead to any rotor slip ring. Connect other lead to rotor core. If continuity exists, replace rotor assembly. Ensure slip ring diameter exceeds minimum specification. See SLIP RING MINIMUM DIAMETER table.
SLIP RING MINIMUM DIAMETER
| Application | In. (mm) | |
|---|---|---|
| Hitachi | ||
| LR180-725 (G20) | 1.024 (26.0) | |
| LR190-714 (M30) | 1.205 (30.6) | |
| LR1110-702 (Q45) | 1.205 (30.6) | |
| Mitsubishi | ||
| A2T13894 (G20) | .870 (22.1) | |
NOTE:
To test stator or diodes, separate them by unsoldering the connecting wires. Use just enough heat to melt solder. Excessive heat will damage diodes.