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Question PSU shutdown after one minute

Discussion in 'Electronic and hardware generally' started by perdixero, May 31, 2017.

  1. perdixero

    perdixero Member

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    Hello!,

    I'm having some problems when using an ATX source to power the motors of a 2dof.

    I have two motors that, according to their documentation, consume 17A. I did not measure it, so I'm not totally sure.

    I bought an ATX source of 800W, in its inscription says that for the 12V it throws 66A. I converted it according to the tutorials.

    I tried to power the two motors but when you want to reverse, the source goes turn off. I imagine it is the moment where they most consume.

    I made the decision to buy another source to use only one PSU for motor.
    The problem is that after a minute of use, the source turned off.

    Any ideas ?.
    According to its specifications, each PSU throws 66A by the rail of 12V (has a single rail).

    Regards,

    PSU_scpec.png
    PSU.png
    perdixero, May 31, 2017
    #1
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    The motors will generate significant power spikes, particularly during fast reversals, which can trip PSU protection.

    You can try including a battery.
    • Like Like x 1
    noorbeast, May 31, 2017
    #2
  3. perdixero

    perdixero Member

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    Thanks noorbeast, I'll get a battery to test.

    Cheers
    perdixero, May 31, 2017
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  4. gigi

    gigi Active Member

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    Hi,
    did you solve with a battery?
    gigi, Jul 14, 2017
    #4
  5. matthew loomis

    matthew loomis Member

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    This could be a ground isolation issue. Many motors just ground the negative, having 2 motors when 1 reverses it is then a 24v circuit tripping the supply.
    matthew loomis, Jul 14, 2017
    #5
  6. perdixero

    perdixero Member

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    Hello,

    @gigi, I have not done it yet. But I have in mind buying a car battery of 80A or 120A and a charger with auto charge cut. Meanwhile I use the PWMmax at 210 (with SMC3).

    @Matthew, I'm not using wiper motors. The motors are well insulated. It is a power consumption problem. For me, the 66A that PSU says are not real.
    perdixero, Jul 14, 2017
    #6
  7. matthew loomis

    matthew loomis Member

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    Ok some thoughts here. You are using a pc power supply. Many of these supply 12v over multiple rails. The rated amps are a TOTAL of those rails. Each one has ocp of a lower current. Are you sure it is single rail?
    matthew loomis, Jul 14, 2017
    #7
  8. perdixero

    perdixero Member

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    Hi matthew.

    In the specifications of the PSU, it says "single rail" and 66A in the 12V.

    psu.png



    The motors say 17A, but I do not have an ammeter to measure the peaks.
    perdixero, Jul 14, 2017
    #8