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Replacing upper board with pot. for treadmill motor speed control.

Discussion in 'Troubleshooting and Repair' started by HazMatt, Sep 5, 2017.

  1. HazMatt

    HazMatt

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    Sep 4, 2017
    20170904_152610.jpg 20170904_152509.jpg 20170904_151601.jpg 20170904_143838.jpg Hi everyone.
    Im brand new to the forum and know nothing of electronics.
    I have a treadmill motor i plan to use for a belt grinder but don't want the bulky display and original buttons/ controls. I do have everything from original set up and motor works with all the factory wiring.
    I want to switch to an analog potentiometer for speed control to eliminate the upper (treadmill display) board but don't know if the motor control board will work independently of it.
    I Will appreciate knowledge sharing. Thanks for looking. HM.
    20170904_152610.jpg
     

    Attached Files:

  2. Minder

    Minder

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    Apr 24, 2015
    Looks like J1 is the control input, it could either be a variable linear pot style input or a PWM signal,
    You could try a 5k -10k pot first to see if it works.
    M.
     
  3. HazMatt

    HazMatt

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    Sep 4, 2017
    20170904_152501.jpg
    Nice. I guess if the pot doesn't work, I'm stuck with the original board then correct? Thanks for the quick response Minder.
     
  4. Minder

    Minder

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    Apr 24, 2015
  5. HazMatt

    HazMatt

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    Sep 4, 2017
    I'll take a peek at the PWM circuit you suggested. Thanks for the input.
     
  6. HazMatt

    HazMatt

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    Sep 4, 2017
    20170911_215415.jpg 20170911_215415.jpg

    I tried various combinations of connections between pot and j2 terminal, no dice.
     

    Attached Files:

  7. Minder

    Minder

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    Apr 24, 2015
    The PWM may be the answer then?
    M.
     
  8. HazMatt

    HazMatt

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    Sep 4, 2017
    May be. With my infantile grasp on electronics and no circuit building experience I feel it will be more direct to use the existing controls. However, now I'm super curious and want to build that circuit.
    That's all I need is another hobby! Any one stop shopping for sourcing the components ?
     
  9. Minder

    Minder

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    Apr 24, 2015
    My go-to source is Digikey, next day air delivery to Canada.
    There are ones on ebay for $1.50, you could strip the unwanted power components off and just use the 555 circuit only if you just wanted the PWM controller part only to play around with.
    M..
     
  10. Alec_t

    Alec_t

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    Jul 7, 2015
    The original control board ensures the motor speed ramps up from zero at power-up as a safety feature. Do you want/need to replicate that feature?
     
  11. Minder

    Minder

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    585
    Apr 24, 2015
    That reminds me, most that use a pot, that requires that it has to be zero when the units is powered for the speed pot to work.
    Did you ensure it was zero when you tried it with the Pot?
    M.
     
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