The company has an AC drive to control a three-phase asynchronous motor, the AC drive panel feedback shows no problem, but the motor do not run at all, what's the problems?

By the way, I detect the motor with a megger and shows good, the resistance are balanced. the drive's feedback shows speed & Hz, but the motor was not running.

If as you said you have test it with a multimeter and shake table to determine the motor and was good, and the cable is no problems.

The key question is to determine whether the AC drive has output signal, remove the AC drive output lines, and the power it, start, test it with an electric pen at the output side to see if it has electricity signals. Or looking for a small three-phase motor, connect it to see whether the AC drive will drag it into running or not.

I encountered such problems, the final result is the failure of the AC drive main circuit with no output.
Either for maintenance or replace a new one.

First, check the cable between the AC drive and the motor is normal or not, if it's no problem, then the AC drives IGBT module is broken, this situation is generally the Japanese drives failure mode.

First detect the AC drive output to the motor is connected properly; Check the drive's internal DC main circuit fuse, the fuse is broken or not; If above situation is fine, you need to replace control board (also called the cpu board), because most of the AC drive signal come from the cpu output after a protection chip (models 242,244, etc.), if it will drive signal is turned off, it will show frequency but no output (motor does not turn).

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