Gallery, Projects and General > How do I??

MC-60 PWM Controller Modifications

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Chuck in E. TN:
I am cross posting this question to several forums.
I have 2 Proform MC-60 treadmill motor controllers, one of which is currently running my X2 mill with its (from the treadmill) 2hp motor.
I have it set up with the original heavy choke, and the original line switch/circuit breaker from the treadmill, and a 5k pot from radio shack for speed control. It works, but still has the soft start feature, and the pot must be turned up about 50% to start the motor. I found son instructions for modifying this controller to remove the soft start, and one that supposedly will allow setting speed and being able to turn the motor on and of at the last speed setting. Only problem, the controller schematic provided with these instructions, doesn’t seem to match the Proform MC-60 I have.
Has anyone modified this controller to remove the soft start? Will a 10k pot make the speed transition smoother?
I have a data sheet on the controller from Surplus Center which pictures the board and shows the connections, but not a proper schematic.

Chuck in E. TN

velocette:
Hi chuck I am a big fan of DC Motors and Controls all my machine tools on DC Power using  "Dart, KB Electronics and Minarek" Controllers. You can get a control to stop and start on the same pot setting by inserting a switch on the "High" wire on the pot. This is just an indication of how it MAY be done.

All work on Electrical equipment you do at your OWN RISK AND RESPONSIBILITY   

Trying to be of some help Eric

Chuck in E. TN:
I'll insert a switch in the high side of the speed pot and see if it helps. Thanks, Velocette.
 
Chuck in E. TN

75Plus:
Chuck, a part of the problem may be the 5K pot. Pots are made in different tapers. The one you need is a linear taper meaning that as the pot is turned the resistance increases evenly. There are logarithmic pots that increase slowly at first then more rapidly as the knob is turned. Some of these pots can be reversed meaning that the high resistance is on the other end of rotation. The BEST kind of pot your application would be a wirewound type. They handle power well and are always linear.

Joe

Chuck in E. TN:
Joe, the pot is linear.
 
Chuck in E. TN

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