Product Manual

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AC Motor Trouble-Shooting Chart (cont’d)
Problem Likely Causes What To Do Motor had been running, then fails Starting switch has failed. Disassemble motor and inspect both the centrifugal and stationary to start. (cont’d) switches. The weights of the centrifugal switch should move in and out freely. Make sure that the switch is not loose on the shaft. Inspect contacts and connections on the stationary switch. Replace switch if the contacts are burned or pitted. Motor runs but dies down. Voltage drop. If voltage is less than 10% of the motor’s rating contact power company or check if some other equipment is taking power away from the motor. Load increased. Verify the load has not changed. Verify equipment hasn’t got tighter. If fan application verify the air flow hasn’t changed. Motor takes too long to accelerate. Defective capacitor. Test capacitor per previous instructions. Faulty stationary switch. Inspect switch contacts and connections. Verify that switch reeds have some spring in them. Bad bearings. Noisy or rough feeling bearings should be replaced. Voltage too low. Make sure that the voltage is within 10% of the motor’s nameplate rating. If not, contact power company or check if some other equipment is taking power away from the motor. Motor runs in the wrong rotation. Incorrect wiring. Rewire motor according to wiring schematic provided. Motor overload protector Load too high. Verify that the load is not jammed. If motor is a replacement, verify continually trips. that the rating is the same as the old motor. If previous motor was a special design, a stock motor may not be able to duplicate the performance. Remove the load from the motor and inspect the amp draw of the motor unloaded. It should be less than the full load rating stamped on the nameplate.