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MC-60 Motor Control

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Chuck in E. TN:
Joe, the choke is not needed/used on either of my applications. both my applications use 11oVAC connected to the MC-60 through the original circuit breaker that was connected to the power cord. I see no option on mine to use 240vac input.
I am currently away from home visiting family, but I will look in my notes on this computer to see if the board will allow 240v operation and get back to you.
Chuck

Chuck in E. TN:
I can find nothing on input voltages in my notes, or in the discussion of this controller online at All About Circuits.

http://forum.allaboutcircuits.com/threads/treadmill-motor-speed-controller-problems.18895/page-2

As all the MC-60 controlled treadmills I have encountered were marketed in the US, I would have to assume you would need a step down transformer to use it on 240v.

Chuck

John Rudd:
To run the controller from 240 ac would need some rework of the components.....the main diodes and the two scrs would need uprating, then the supply for the 12v rail would need conponent mods too....
It can be done, the KB controllers which are similar are available in two flavours,110 and 240v....but why not buy a suitable controller? Unless of course you like tinkering like me?  :zap:

JHovel:
I like tinkering  :beer:
Using a step-down transformer is a no-brainer, but it gives you 90V not 180.....
I did buy a Chinese 240VAC to 180VDC controller, and it works, but the motor makes a very loud humming/cogging noise all the way through the speed range. So it will definitely need some kind of smoothing. I'll try different coils and transformers that I have here, after measutring their coils' inductance. I tried today with a 1.8mH choke, that made no difference.... need something bigger.
The interesting thing to me is that the origina digital controller has NO choke at all, not even very large capacitors. It must be working at very much higher pulse frequency than the Chinese one I got.

mackn918:
 :update:  R42 Resister value For the MC-60 controller is..  *54.9K Ohm. the band colors are [Green-Yellow-White-Red-Brown]
If your motor does not start until the potentiometor is turned about half way replace or resolder r42 for fine motor control over full range.

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