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Can the M2 PSU use input from another PSU to power on and off?

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  • Can the M2 PSU use input from another PSU to power on and off?

    I use my M2 to power my monitor and USB hub in the dash, and it's setup currently to monitor the ignition for ON/OFF...except this is draining the battery too fast (M2 + OPUS for the PC).
    I want to run a lead from the OPUS power output to the M2 to trigger the M2's ON/OFF state...
    But it's critical that the M2 stays powered the whole time the OPUS is on (including shutdown sequence) as to not interupt the USB device power...

  • #2
    yes, it should work fine.

    the only problem i see is the 5sec startup delay that the m2 has...
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"


    next project? subaru brz
    carpc undecided

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    • #3
      Is that delay always there, even when it is in ATX push button mode?

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      • #4
        i believe it is always there, and the only way to remove it was that custom firmware that someone developed..
        My OLD 2001 Mitsubishi Eclipse GT:
        "The Project That Never Ended, until it did"


        next project? subaru brz
        carpc undecided

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        • #5
          ****...these M1/2/3/4 PSU's are garbage!!

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          • #6
            Manual...

            When all config jumpers are removed, M2-ATX-HV will be in the “dumb PSU
            mode”, no ignition timing, no HARDOFF. M2-ATX-HV will send a gratuitous “ON” pulse
            to the M/B when power is applied for the first time...

            Since it's not hooked up to a mainboard, will the M2 actually power on and off then?

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            • #7
              that's why i use a dsatx....

              that section is just talking about the J7 jumper activity..

              that might be the way you need to set it up, but you would need to add a relay to cut power the +12v constant line so the opus can control it.
              My OLD 2001 Mitsubishi Eclipse GT:
              "The Project That Never Ended, until it did"


              next project? subaru brz
              carpc undecided

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              • #8
                Jeez...maybe I'll just make my own 12V and 5V regulator and forget the M2 altogether!

                Or like you say, a relay controlled by the mainboards PSU.

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                • #9
                  Originally posted by WuNgUn View Post

                  Since it's not hooked up to a mainboard, will the M2 actually power on and off then?

                  No, but can be,

                  You will need to short the PWR OK pin to gnd.

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                  • #10
                    Done that already...

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                    • #11
                      Of course, I plan on using Sleep mode-to-hardoff with the OPUS, so I need to power the M2 thru a relay off the 5V rail to keep the USB devices powered during sleep mode, right? Can I tap into the 5V lead feeding the mainboard for this I assume?

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                      • #12
                        what's preventing you from using 1 psu to power everything?

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                        • #13
                          The OPUS is already loaded down, what with 2 PCI soundcards, water pump, etc...I don't think it can handle the monitor plus another USB hub

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