ABB acs601 short circuit fault

Hello,

I have a customer with a ABB ACS601-0025-2-000B1500001. I cannot seem to find a good troubleshooting manual online.

This is one vfd running one vacuum pump motor. They very randomly get a short-circuit fault and it shuts down. They can reset it and it will start again. They say that it trips out on average of once a week.

Since I couldn't find a good manual and my experience with this drive is limited, I wasn't sure what all this could mean.

Is it correct to assume that the vfd is detecting a short circuit on the output side of the vfd, either wiring or motor? Why is it so random?

Check this manual for the faults generated by the drive and what to do starting page 134
https://library.e.abb.com/public/bcf53a98d1bebc6dc1256d28004058a8/en_pfc5xfw_2.pdf

the short circuit fault is usually due either to:
loose connection
bad cable / bad insulation of the motor (you can use a Meggger to check )
faulty drive

It could be too fast accel, bad current loop tuning, or water in the motor conduit as well...