Electrical/Electronic Question

Discussion in 'Electronics Repair' started by RailRoadX, Aug 12, 2017.

  1. RailRoadX

    RailRoadX

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    Have a possibly simple E/E question.

    Own an elliptical machine that contains a small brushless 12v DC three-speed cooling fan.

    Problem: Original cooling fan would crank in all three speed settings but not run. Purchased a new fan and the same situation has occurred. The new fan will crank in all three-speeds and stop but will not run.

    Question: Is the problem the fan? Or, is the problem the board, a possible diode/capacitor type problem on the circuit board?

    Any advice/suggestions would be greatly appreciated.

    Thank you.
    RRX
     
    RailRoadX, Aug 12, 2017
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  2. RailRoadX

    kellys_eye

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    make/model?
     
    kellys_eye, Aug 12, 2017
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  3. RailRoadX

    RailRoadX

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    The elliptical is a Livestrong manufacture licensed to China by Johnson Fitness in the United States out of Wisconsin.
    The fan is a Three-Speed DC Brushless model: HDS-7530H 12v DC 0.31A
    Shenzhen Coolrui Electronics Co, Ltd.
     
    RailRoadX, Aug 12, 2017
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  4. RailRoadX

    RailRoadX

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    Elliptical Model: Livestrong LS8.0E
     
    RailRoadX, Aug 12, 2017
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  5. RailRoadX

    Minder

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    The fact you replaced the fan and still the same condition occurred would seem to eliminate the fan as the problem!
    Which logically points to the controller.?
    M.
     
    Minder, Aug 13, 2017
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  6. RailRoadX

    SparkyVT

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    Going to ask a few questions along the lines that I have to while trouble shooting at work.

    Did the original fan ever work? Polarity could be the issue if it hasn't you could try reversing the wires to see if that resolves the issue. Some DC fan motors have protection built into them.
    You say that it cranks but doesn't spin, have you tried to spin the fan? Both with and with out power applied, to see if it is catching physically on something or it may help show that one of the fields isn't powering up.
    How many wires is the motor? Did it come with a plug? I tried searching it but couldn't find anything on it.
     
    SparkyVT, Aug 13, 2017
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  7. RailRoadX

    RailRoadX

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    Hello Sparky VT:

    Yes. It started the intermittent crank and stop about 2-3 weeks ago and had worked for over 5 years.

    Yes, the fan spins freely. I have the original apart and it and the new fan both spin freely (with and without power) so I would assume that that would eliminate a mechanical malfunction i.e. bearing bind etc.

    2, (red and black).

    Yes.

    The fan is a Three-Speed DC Brushless model: HDS-7530H 12v DC 0.31A
    Shenzhen Coolrui Electronics Co, Ltd.

    Elliptical Model: Livestrong LS8.0E



    Thank you.
    RRX

    P.S. If you are from Vermont, you just may recognize the locality in my avatar.
     
    Last edited by a moderator: Aug 13, 2017
    RailRoadX, Aug 13, 2017
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  8. RailRoadX

    Minder

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    There are many 12v BLDC fans out there, ebay etc, you may not have 3 sp control, unless this is important.
    If only two wires then the BLDC conversion is internal, I assume they may just change the voltage for the slower operation.
    But if a new fan did not cut it then you need to check the voltage out.
    M.
     
    Minder, Aug 14, 2017
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  9. RailRoadX

    SparkyVT

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    I am from Vermont originally, though my youth was spent as an army brat. My guess would be that is the restored Burlington to Vergennes line. My guess is over the otter creek, but I don't remember if the line goes down that far.

    At this point I agree with Minder, going to have to check what you are getting as far as an output voltage.
     
    SparkyVT, Aug 14, 2017
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