Q.Is there any way to check if the AC motor is broken?

The following 3 methods can be used for a simple check.

[Confirmation Method]

1. Confirm the winding condition by measuring the motor winding resistance value
2. Confirm the capacitor capacitance
3. Check for deterioration of bearings by turning the motor shaft by hand

[Caution]

• When checking, be sure to shut off the power supply to prevent electric shock and short circuit accidents.
• If the breaker trips at the same time as the power is turned on, the motor power line may have a ground fault or the motor may have suffered a dielectric breakdown.
  We recommend that you replace the motor and capacitor without turning on the power supply.

>>For details on how to check if the AC motor does not rotate, please refer to the following.
Q230. The AC motor does not rotate. Is there any way to check the cause of no rotation?

>>We will perform the inspection free of charge. Click here to learn how to make a request.

Details

1. Confirm the winding condition by measuring the motor winding resistance value
   Measure the motor winding resistance value using the following table as a reference, and check the windings for open circuits or short circuits.

   

   In case of disconnection

   There is a possibility of wire disconnection if the resistance value of each phase is more than a few kΩ

   In case of short circuit

   If the resistance value is less than 1 Ω, there is a possibility of internal short circuit

2. Confirm the capacitor’s capacitance
   Make sure that the appropriate capacitor for the motor is used.

   • Check the capacitance
     Check that the capacitance (μF) listed on the side of the capacitor and on the motor nameplate are the same.

   • Check the voltage
     Make sure that the voltage (VAC) marked on the side of the capacitor is approximately twice the voltage (V) marked on the motor nameplate.

   

3. Check for deterioration of bearings by turning the motor shaft by hand
   With the gearhead removed, turn the motor shaft by hand to make sure it is not locked.
   Because the reversible motor has a friction brake, there will be some contact noise and resistance, but this is not abnormal.
   For electromagnetic brake motors, release the electromagnetic brake before checking.
   Since the gearhead of the right-angle geared type and worm geared type cannot be removed, it cannot be checked by turning the motor shaft by hand. We recommend that you send it in for inspection.
   For more information on how to request an inspection, please click here.