Reasons why the motor cannot rotate after power on

Three phase induction motor is widely used, but after long-term operation, various faults will occur. Timely judging the cause of the fault and handling it accordingly is an important work to prevent the expansion of the fault and ensure the normal operation of the equipment. After power on, the motor cannot rotate, but there is no abnormal sound, peculiar smell and smoke.

Cause of failure

① The power supply is not connected (at least two phases are not connected);

② Fuse fusing (at least two-phase fusing);

③ The overcurrent relay is adjusted too small;

④ Control equipment wiring error.

Troubleshooting

① Check whether there are breakpoints at the power circuit switch, fuse and junction box, and repair them;

② Check the fuse model and cause, and replace the fuse;

③ Adjust the setting value of relay to cooperate with motor;

④ Correct the wiring.