DC Motor Question

[rr361]

Got a problem with a DC motor on my bandsaw. I have a 1949 Delta Rockwell and did the DC motor conversion just as this guy did to his HF bandsaw:

http://rvbprecision.com/garage-entertainment/bandsaw-conversion-to-dc-drive-wood-to-metal-cutting-conversion.html

Here is the link to the controller:

http://www.surpluscenter.com/Electric-Motors/DC-Motors/Motor-Speed-Controllers/90-180-VDC-SPEED-CONTROL-W-POT-11-2269.axd


I bought the same motor and the same controller. Real easy to do - or was it. I fired it up and things were fine. Cut some steel and all seemed well. Plugged it in this past weekend and it now surges no matter where the pot is set. I can even stop it with really thin steel.

Now, I know absolutely nothing about these type of electronics. I would think the first thing to check is the pot but it does change the speed. I just get surging through the range. Any of you guys have any thoughts on what might be going on.

Thanks!
Robert

 

[pattenp]

If you are getting surging I would say the pot is not working properly.

 

[matt_i]

I'm a little rusty on my DC drives but all those pots at the bottom of the drive card are what you need. This is a bit of a guess but the IR comp may be sort of a "gain" in the drive, too much gain and you get unstability. Ideally the instructions will have more info.

 

[laser3kw]

MINARIK model MM23001 manual
or
250-0091 manual
see the troubleshooting section

 

[rr361]

Thanks for all the info! Not sure why I never thought to look up the manual for the boardl...

 

[dogdog]

great conversion link, I have the same controller and some motor sitting for years now.