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If this is a common problem, install a surge protector.Ĭontact Us Search for Your Motor Upload Your Application Specs. Possible power surge to the motor (caused by a lightning strike or other high transient voltage). Verify that the ambient temperature does not exceed the motor’s temperature rating (found on the nameplate). Check and compare the actual motor loads to the motor’s rated load capabilities. If the motor is used in an environment with high ambient temperatures, a different type of bearing grease may be required. An unbalanced load will also cause the bearings to fail. Check the motor load and inspect the drive belt tension to ensure it’s not too tight. Load to motor may be excessive or unbalanced. Check the power supply to make sure voltage is accurate. For defective winding, replace the motor. Test the winding for shorted or open circuits. Consider switching to a smaller motor for excessive vibration. Some vibration at a light load is standard. 
If the bearings are bad, you will hear noises or feel roughness. Remove the motor from load and inspect the motor by itself.Load out of balance (direct drive application).Inspect all the electrical connections for proper termination, clearance, mechanical strength, and electrical continuity.Check the stator resistance at all three phases for balance.Check the input voltage at each phase of the motor to make sure the motor is running at voltage specified on the nameplate.If there is excessive dirt build-up, clean the motor. Check external cooling fan to be sure air is moving properly through the cooling channels.Reduce the load or replace the motor with one of greater capacity. Locate and remove the source of excessive friction in the motor or load.Compare actual amps (measured) with nameplate rating (Note: A properly operating motor may be hot to the touch.) Most motors are designed to run in an ambient temperature of or less than 40☌. Verify that the motor is getting enough air for proper cooling.
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It should be less than the full load rating stamped on the nameplate (only true for three phase motors). Remove the load from the motor and inspect the amp draw of the motor unloaded. If the previous motor was a special design, a stock motor may not be able to duplicate the performance.
If the motor is a replacement, verify that the rating is the same as old motor. Motor Overloaded/Thermal Protector Continuously Drips Groschopp wiring diagrams can be found within the “Wiring Diagrams” page of our resources section or on individual motor pages.Ħ.
Rewire the motor according to the schematic provided with the motor. If not, contact your power company or check if some other equipment is taking power away from the motor. Make sure the voltage is within 10% of the motor’s nameplate rating. Noisy or rough feeling bearings should be replaced by the motor supplier. Test the capacitor per previous instructions. If it is a fan application, verify that the air flow hasn’t changed. Verify that the load has not changed and the equipment has not gotten tighter. If the voltage is less than 90% of the motor’s rating, contact your power company or check to see that another piece of equipment isn’t taking power away from the motor. Steady zero ohms indicates a short circuit steady high ohms indicates an open circuit. If the capacitor is OK, the needle will jump to zero ohms, and drift back to high. To check the capacitor, set the volt-ohm meter to RX100 scale and touch its probes to the capacitor terminals. Capacitor (on single phase motor) may have failed. Verify the amp draw of motor versus the nameplate rating. If leaks are found, the motor must be replaced. Stator is shorted or went to ground (Motor will make a humming noise and the circuit breaker or fuse will trip). Motor Has Been Running, Then Fails to Start Check the source of power, overload, fuses, controls, etc.Ģ. Rotate the motor’s shaft and feel for rubbing. Motor damaged and rotor is striking stator. Refer to the wiring diagram to verify the motor is wired correctly. Motor Fails to Start Upon Initial Installation If the motor problems can’t be resolved with this list, please contact your supplier for assistance. Use this resource to troubleshoot your AC motor.
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