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Thread: A twist on the PSU override switch

  1. #1
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    A twist on the PSU override switch

    Hello, I just finnished a thorough session of reading and some hard thinking trying to figure out how to get my power supply (m2-atx) to stay on when shutting off the truck. Ideally, I'd like to be able to turn my key to the acc. position or off and have the psu stay on. I've already got a toggle switch on my acc. line, I thought that adding a second switch from my constant 12v spliced in after the acc. switch would do the trick.
    Also I've already got a diode wired from J4 to J3 which allows smooth bootup. And I'd like to be able to shut the system's constant 12v off completely. and use an indicator led telling me when i'm in overide mode.

    After looking i found this solution, however i believe that i'd have to select the override position before starting my truck. I'd like to be able to go from having the computer on directly to override mode without shutting down, will this setup accomodate that with just one switch, or will it shut down while going from position one to 3?:
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    Constant Bitrate Sleepyz0mby's Avatar
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    the m2 atx has a five second wait time

    so as long as u switch it between the two (1 & 3) in under five seconds u should be fine

    the "power off" timer resets to 5sec as soon as j3 gets 12v+ sooo u could turn the truck off then to acc then to off again then flip the switch and the m2 wont send the "power off" signal to the mobo as long as none of your transitions take more tan five seconds


    FYI the m2 will consume ~10mA until hardoff=true (via jumper settings) regardless of j3 status

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    Newbie visenri's Avatar
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    You need an extra diode in the wire that goes throught the switch in position 1.
    Without this extra diode, in position 3 you will throw 12V into IGN/ACC throught the diode.
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    justchat_1's Avatar
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    You don't need any diodes in this setup....the switch handles the power isolation.

  5. #5
    Newbie visenri's Avatar
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    Quote Originally Posted by justchat_1 View Post
    You don't need any diodes in this setup....the switch handles the power isolation.
    That's right, sorry, i didn't think about the triple switch.
    WV GOLF V sportline with sempron 3100 under the seat.
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    The Last Good Gremlin GizmoQ's Avatar
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    Quote Originally Posted by justchat_1 View Post
    You don't need any diodes in this setup....the switch handles the power isolation.


    I use the same type switch (with illumination). Make sure its a high current isolated switch (I burnt up a couple cheapie automotive ones)
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  7. #7
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    Quote Originally Posted by Sleepyz0mby View Post
    the m2 atx has a five second wait time

    so as long as u switch it between the two (1 & 3) in under five seconds u should be fine

    the "power off" timer resets to 5sec as soon as j3 gets 12v+ sooo u could turn the truck off then to acc then to off again then flip the switch and the m2 wont send the "power off" signal to the mobo as long as none of your transitions take more tan five seconds


    FYI the m2 will consume ~10mA until hardoff=true (via jumper settings) regardless of j3 status
    I don't believe the five second thing is correct. The psu merely waits 5secs. after recieving 12v on acc. to begin startup, thus avoiding the voltage drop from the starter.
    if i start my truck and boot up my comp. then more than five seconds later switch the key from "running" to acc. then the computer will goto hibernate. This is what i'm looking to eliminate. I'd like to start the truck in normal mode, and then while driving switch to override mode. I definetly can't turn key at all (or switch the acc override toggle that i have wired inline) because it will shut down the comp.
    would installing a capacitor inline with this setup from the acc. line maintain 12v while switching to a constant 12v to j3? that way it would never see a change in the input, and stay running.
    thanks

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    I found some switches on ebay, they are DPDT ON/ON push button switches with built in blue leds. I think this would be my ideal setup, if it makes sense electrically. If the voltage drop is an issue, would a cap. help? or do you have other suggestions to maintain 12v so my comp. doesn't reboot during the switch to override mode?
    I need your collectively brilliant minds to check it out because i'm not that inclined when it comes to this stuff.
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    Constant Bitrate Sleepyz0mby's Avatar
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    ??? odd

    is your "auto latch" working. (60 sec after j3=12v+ m2 will not send power off")

    check your jumper settings for "off delay". (j10) what are they set at?

    cant be your wires cause m2 would cut all power after the ignition=0v

    verify that ignition=12v+ with key in acc. did your last radio turn on with key in ignition?

  10. #10
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    Quote Originally Posted by Sleepyz0mby View Post
    ??? odd

    is your "auto latch" working. (60 sec after j3=12v+ m2 will not send power off")

    check your jumper settings for "off delay". (j10) what are they set at?

    cant be your wires cause m2 would cut all power after the ignition=0v

    verify that ignition=12v+ with key in acc. did your last radio turn on with key in ignition?
    There is definetly 12v+ when i switch to my acc. position both from the off position and from the running position. However, i sometimes notice on the multimeter a negative pulse. That's the reason i wired in a diode to stop the computer from booting back up when i shut down the truck. I would shut off and then the computer would show the bios splashscreen then it would hardoff. the diode fixed that.

    if i hop in my truck and put it into the acc. position from off then the psu will boot. if i then start the truck, off it goes. then i reset my acc. power switch and it will boot up again. back to the acc. position, same thing.

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