Sorry, been out in the shop working on my own electrical screw-up. Not sure about the 220/180vdc issue. I know the top speed/max voltage is adjustable on the KB but that seems pretty far apart for a simple adjustment. Like you noted, the KB specs do say max 180vdc. They know their product I'm sure. That's some motor you've got there and I guess it has a speed controller to match. I'm not an expert on this stuff, just a happy KB user. I'd hate to send you down the wrong path; maybe someone with professional experience will comment. I'm using CNC4PC's C-11 multi-function breakout board/speed control. I'm pretty sure the speed control section is the same as the C-6. It works fine, handles forward/reverse and speed control but I had a lot of trouble with the instructions concerning the isolation issue. I blew out a track on the board due to my lack of understanding but fortunately was able to repair it. I finally got it all working by adding a KBSI-240D Signal Isolator board between the C11 & the KB. Got it used on ebay for $25 and it fixed my problem.