DC motor/drive help.

[J. Hoffman]

Tonight my variable speed DC grinder started acting strange. It doesn't seem to change speed from 0-30 and again from 80-100. I usually run this grinder pretty slow, but now it won't get slow enough. Do the potentiometers go bad in the drives? Hoping it's something I can just fix.

 

[Sean Jones]

I believe @John Wilson is the man to answer that question. Hopefully he'll be along soon.

 

[J. Hoffman]

After multiple emails and multi meter tests with Electric Motor Wholesale, I have a new drive on the way. I guess you only get 34 years out of a Leeson DC drive