1) Measure the insulation resistance (should not be less than 0.5M for low voltage motors).
2) Measure the power supply voltage, check whether the motor wiring is correct, and whether the power supply voltage meets the requirements.
3) Check whether the starting equipment is good.
4) Check whether the fuse is suitable.
5) Check whether the motor is grounded and connected to zero is good.
6) Check whether the transmission device is defective.
7) Check whether the motor environment is suitable and remove flammable materials and other debris.