Hello,

I have spent the best part of last year putting together a potters wheel out of a treadmill motor, pwm board and control board, had it up and running and all was going really well.

Then I shorted the speed control pot to ground (the pot comes off the control board, so its blown that I think)

Ive looked through a whole bunch of different forums and websites and still cant find a way to bypass the control board. The motor is fine and so is the pwm.

the pwm board has outputs for the motor out and power in and a connector with pins labelled l w h h +12v and ground that go to the control board from what i can figure lwh are the pot and i guess that the 12v and ground are to power the control board,
im not sure what the second h is for?

is there a way to fool the pwm into controlling the motor without the control board?

any help would be greatly appreciated as im at a bit of a loss right not.
just about ready to buy another treadmill

thanks in advance, James

 

here are the photos of the circuit boards
the wires on the control board (bc-8595ii) are green and orange = vr1, white = led, and green and yellow = power switch all five wires go to a 10k pot with a switch at 0 ohms

control board connects to the pwm with l w h h m +12v gnd but the the control board plug also has speed and +3v coming out of the same connector

 

two more pictures of the connectors that join the two boards together, im not sure if the brown and black wires were used at all.
the red and black wires to the right of the controller go to a safety switch

 

i can see in last pic that C10 is blown... how is your troubleshooting skill? what can you tell about motor?

 

Thank you for the help,

I thought that c10 looked bulged, I can replace it easily enough, will go and buy one now. My trouble shooting skills aren't great but i do know how to use a multimeter.

the motor is 1hp 180v 4 amps - catalog listing c8apa1 - 4000 rpm permanent magnet

 

i am am replacing c10 now, how should I wire the connector on the pwm board (l w h h 12v gnd) to my 10k pot?

 

Im pretty sure that the pwm board is working because if I short the pot to ground I can get the motor to run at full speed. I think that its just the control board that's fried is there is there no way to use the pwm by itself for speed control?

 

Ive replaced C10 and attached my pot to l w and h for low wiper and high, its till not working, what should i do now?

 

I think that i am using the wrong names for the boards

There are two boards one of them sits at the top of the treadmill with the pot on it and some screens and timers etc, thats what has stopped working.

the other board is the motor control board which I think is fine

 

If it is the board I am thinking of and it has isolation, look for a 6 pin Opto isolator IC they often fail.
Max.

 

it doesnt have a six pin ic

its got one ic labelled u3 which is a 4 pin (Ic - pc817)
and one ic labelled u1 which is a 14 pin (ic - tc4013bp)
I cant see a u2 anywhere

what do you mean by isolation? I know that the board was isolated and not earthed
I shorted the pot to ground which i thinks fried it

how do i check them?

 

The PC817 is the Optoisolator.
Max.

 

ok cool im going to take it into a specialised pcb repair shop during the week, will let him know.
I dont know how to test it myself, i remember learning at school how to know which legs are which but i dont know what i'm checking for.

I can replace it myself if that is the culprit.

Thanks alot for the help