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replacing control panel on Treadmill with potentiometer

Discussion in 'Power Electronics' started by jeff kopp, Sep 25, 2020.

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  1. jeff kopp

    jeff kopp

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    0
    Sep 25, 2020
    [​IMG] [​IMG] Trying to use the DC motor and power board on a treadmill for a sander build. The control panel has a 12 pin connector between it and the power board. Would like to eliminate the control panel with a simple 5k potentiometer.
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009

    Not going to happen

    The pot will not handle even a tiny fraction of the current needed for the motor to operate
    that's why there are controllers for such situations
     
  3. Minder

    Minder

    3,076
    657
    Apr 24, 2015
    What is the model of the motor board, I designed some for the MC2100 series that require a 20Hz PWM control signal.
    These use a pot and a start & stop P.B.
    This is when using the motor controller in a stand-alone installation, drill press, sander etc.
    M.
     
  4. Minder

    Minder

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    Apr 24, 2015
    I assume the OP is asking if he can substitute the control console with a 5k pot into the motor control board.
    That is the way I read it anyway.;)
    M.
     
  5. Alec_t

    Alec_t

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    Jul 7, 2015
    How many wires go from the control panel to the power board? Any more than 3 and you'll need more than a pot for controlling the motor. Even with just 3 there's no guarantee a pot would suffice.
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009
    regardless of the number of wires, a pot on it's own isn't going to handle the voltage and current
     
  7. Minder

    Minder

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    Apr 24, 2015
    Like I said the MC2100 and some others will not do it with a pot, it requires a PWM signal, this was sent down from the console in normal operation.
    The older MC-60 had a 5k-10k pot that would do it. This was a SCR bridge controller.
    So far the OP's board is unknown.
    M.
     
  8. Alec_t

    Alec_t

    2,950
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    Jul 7, 2015
    Totally agree, but we don't know what is on the 'power board'.
     
  9. Minder

    Minder

    3,076
    657
    Apr 24, 2015
    I think there is a little confusion as to what exactly the pot refers to, the OP did say 'replace the control panel',
    Which to infers that he wants to use the motor board as a stand-alone unit.
    Not use a pot to directly control the motor.
    M.
     
  10. dave9

    dave9

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    Mar 5, 2017
    Since you did not give us enough info to see a solution, it is not possible, yet.
     
  11. ThePro

    ThePro

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    Jun 4, 2021
    Hello,
    Great job on your analysis.

    I am trying to locate the related V+ and V- on my treadmill board (B102S S07 Shanghai Elect) to hook up on a Signal Freq Gen (XY-KPWM) to run my DC motor.

    Background:
    My treadmill console acts faulty (occasionally ask for safety key although installed) so I would like to replace it with a pwm controller to run the treadmill motor only.
    So, I suspect for the four connections required on the signal generator are:

    PWM = Yellow wire PWM
    Ground= Purple wire GRD
    V+ = ?
    V- = ?

    Can you please help me locate the related wires from the lower control board. Thank you in advance. Screenshot_20210603-164522_Gallery.jpg Screenshot_20210604-105901_Chrome.jpg
     
  12. Minder

    Minder

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    Apr 24, 2015
    Know nothing about that model, but you could try a PWM signal into the PWM and VDD (Common).
    I suspect the rest are other signals to the console, the problem maybe the frequency of the PWM required.
     
  13. ThePro

    ThePro

    2
    0
    Jun 4, 2021
    Thanks Minder.
    So are you suggesting:
    PWM = Yellow wire PWM
    Ground= Purple wire GRD
    V+ = Green wire VDD
    V- = ?
     
  14. Minder

    Minder

    3,076
    657
    Apr 24, 2015
    The VDD maybe a source for the console, at least this is how the MC2100 boards work that I am familiar with.
     
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