How can I make this treadmill motor controller just a simple controller with a potentiometer?

Discussion in 'The Projects Forum' started by Ironworker613, Jan 20, 2016.

  1. Ironworker613

    Thread Starter New Member

    Jan 20, 2016
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    I have a johnson fitness JDYF02L controller board and a johnson 2.25 hp dc90v motor out of a horizon cst4.6 treadmill. I am trying to find a way to control the motor with the controller board somehow so i can mount it onto my milling machine and have variable speed. I have found info of it being done on many other types of controllers just by wiring in a potentiometer to a G O H or L W H marked terminal but this board does not have those that are clearly marked. Please help
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Is there a part No on the board is it JDYF02L the only number?
    Most have a pot input but some have a an exception and are PWM control signal input.
    Or post a pic of the motor board.
    Max.
     
  3. Ironworker613

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    Jan 20, 2016
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    There is some numbers on the heatsink JC07-001 SJED08089IF VER:H109 JC07MC0608AA06947. I will try to post some pictures as soon as i figure out how. I do know that in the main harness coming from the original dash it has a PWM terminal. Thank you for the help
     
  4. Ironworker613

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    Jan 20, 2016
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    20160120_233512.jpg
     
  5. Ironworker613

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    Jan 20, 2016
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  6. Ironworker613

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    Jan 20, 2016
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  7. Ironworker613

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    Anyone?
     
  8. Ironworker613

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    Jan 20, 2016
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    Please
     
  9. MaxHeadRoom

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    Unfortunately nothing comes up in any searches.
    Max.
     
  10. Ironworker613

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    Jan 20, 2016
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    Ya i did alot of searching and could not find any schematic on this board. I need to learn how to reverse engineer this thing then I guess.
     
  11. MaxHeadRoom

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    Jul 18, 2013
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    In the absence of anything useful it may the only way to reverse engineer, I think I would start at the drive mosfets, I am guessing it is PWM output, and work back from there rather than the input connectors.
    Max.
     
  12. Ironworker613

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    Jan 20, 2016
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    Can this help at all? 20160122_235903.jpg 20160122_235903.jpg
     
  13. Ironworker613

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    Jan 20, 2016
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    Ive kind of narrowed it down to the 8,9,10th pins that "I think" go to the main motor which are +15v/VOD, speed command power/PWM, RELAY/MOTOR. I have atleast ruled out the other pins. Can someone please tell me what i need to do to make this work? And could someone also tell me what kind of power i should have on the positive and negative side of the MP3508w 35A bridge rectifier?
     
  14. MaxHeadRoom

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    Jul 18, 2013
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    If it is a PWM controller you will have around 165vdc on the output of the bridge for a 120v AC in.
    Max.
     
  15. Ironworker613

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    Jan 20, 2016
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    I found another number on the board that i overlooked! WJ28041T I hope this helps, im still struggling with this thing!
     
  16. MaxHeadRoom

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    Jul 18, 2013
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    Well at least that appears to be The valid number but no luck anything showing up so far.
    Where does the pin marked PWM go to?
    Max.
     
  17. Ironworker613

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    Jan 20, 2016
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    I have zero ohms between the pwm pin and the gate pin of the IRFP260N mosfet. I jumped the main power relay because i cant figure out what turns it on and i get 165vdc to the pos and neg motor pins. How do i switch this mosfet?
     
  18. MaxHeadRoom

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  19. Ironworker613

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    Jan 20, 2016
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    Wait i was wrong, I forgot i dismounted a resistor that was mounted next to the mosfet in that circuit.
     
  20. Ironworker613

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    Jan 20, 2016
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    There is a 6N136 optocoupler in the pwm circuit. In between there are many small surface mount resistors an such. I get a 2.12kohm reading between the pwm pin and the third pin of the optocoupler.
     
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