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Check your ASR settings. Sounds like your motor may be "hunting" during the decel.

What's the size of your drive? If you are using a drive to convert single phase to three phase, you will need to oversize your drive.

Waross: "outdoors is best"?? How about outdoors is essential!! Hydrogen and Oxygen gasses will be generated. If done indoors these gasses could collect and stratify and become dangerous around anything with an open flame or spark igniters. cbrunner: I've looked at a couple of your previous...

The "tap changer" is probably step switches. Often, these switches are timed to drop out one after the other, varying the current draw and thus the torque. Four resistors would give you five steps.

Using the VFD for the sole source of braking is fine unless there is a chance for a "runaway". During an inadvertent power loss the VFD loses its braking capabilities. Using a electromechanical brake that opens at power-up and closes at power-down in addition to VFD braking might be something to...

This wouldn't happen to be used as a phase converter; i.e. single phase to three phase?

jraef, I should have added that jumping motor overloads is never a fix, and should be used only as a troubleshooting tool.

In my previous post I said to jumper the NO contacts on the MOLs. Everyone knows that MOL contacts are NC. My mistake, My first post. Sorry. Sincerely, lectricwes

look... I'm just a maintenance electrician.... it's been my experience that 80% of all breakdowns are caused and cured by the simplest fixes. Change the overload block and the heaters. If you are a jobber or an independent, and this is prohibitively expensive, then jumper the NO on the OL...