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Thread: Optional Power Switch (M2-ATX)

  1. #31
    MySQL Error soundman98's Avatar
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    to add to the confusion-- i have 4 switches for my carpc/aux lights..

    1. controls a constant 12v, so i can take the key out, but leave the acc. circuit powered up.
    2. controls the acc signal to the pc.
    3. a momentary switch, is connected in parallel to the power button leads on the power supply-- so the psu can still turn the mb on, but i have manual control as well
    4. a momentary switch, this one is connected as the reset button on the mb-- very handy to have!

  2. #32
    Variable Bitrate Wayne613's Avatar
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    Nice. I just don't miss the old reset buttons on the desktops, just an extra 2 seconds of holding the power button to shut it off should it lock.

    This is all mine is below, just a manual momentary switch for shutdown/startup leads as described, with the external LED leads from the PSU hooked up so it flashes the status.

    Nothing fancy, but I didn't want to really do more than was necessary, and I debated on whether or not to even have this visible as drilling visible holes into a new car isn't my usual first choice.

    I'm still ****ed they put self-tapping screws in the front facade for the front license plate that's required in MD. The bastids.
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  3. #33
    Low Bitrate scottholmes's Avatar
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    Quote Originally Posted by Wayne613 View Post
    Correct, this would only keep the PSU from seeing 12v on the line or not when you turned the key. This won't give you direct manual control. It will however with the M2, so long as you set the jumpers for it, allow you to shut it down with the hardoff setting after the set delay once you flip the switch to cut 12v from the ACC/IGN line to the M2. And it will still send the shutdown pulse of course once this happens, so long as your computer is operating normally, and is set correctly, it'll shutdown this way when you want it to as well.

    And as another given, start it back up if you decide during a trip to switch it back on. With a 10 second gap in between each from what I recall of the documentation I read last night.
    that sounds like the side affect will help me turn it off if i so wish (as you say diagnostics and stuff). I've downloaded the M2 manual again so i will try and work out what jumpers i need to set and what to set it to allow this.

    Thanks Again!

    Edit: Is it one of the J10 settings or something to do with J9?

  4. #34
    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by scottholmes View Post
    that sounds like the side affect will help me turn it off if i so wish (as you say diagnostics and stuff). I've downloaded the M2 manual again so i will try and work out what jumpers i need to set and what to set it to allow this.

    Thanks Again!

    Edit: Is it one of the J10 settings or something to do with J9?
    J10 has the various settings your looking for to set. J9 and J8 are really one in the same, either can be used for the red/black power button lead that comes with it to connect the motherboard power button pins on the header. Or can be used for a momentary power button switch.

    EDIT: your kinda screwed from what I see. Your best is going to be 45 seconds should your computer lockup while driving, and that's after the 5seconds have passed for the graceful shutdown time. So 50 seconds minimum [if the computer is frozen] once you hit your switch to turn off the ACC line feed to the PSU (see number 5 of section 2, mode of operation).

    Assuming everything is working correctly with their suggested setting of having just "B" jumped on J10, you will have the PC shutdown 5 seconds after the ACC/IGN line is turned off with or without the switch you bought, and for 2hours the 5volt rail will still get power. With this setting if your PC is not setup or working correctly then it will leave it running/locked-up, then, essentially pull the plug on everything after 2hours, much like yanking the cord on your desktop.
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  5. #35
    Low Bitrate scottholmes's Avatar
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    Ok, I just had a thought, to keep it simple!

    Switch I have ordered to be able to control if it turns on or not, and that's it.

    The power button on the case connected to J9 that should I wish to turn the PC off I could just use that?

    Sounds ok?

    Scott

  6. #36
    Variable Bitrate Wayne613's Avatar
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    If you have a case specifically for this, then yes, you can wire it's button to J9. To be clear, you still need to run J8 to the motherboard's power button pins. Since the button is just doing manually what the other leads are set to do with the PSU's micro-controller.

    If you do this your original plan should be ok, so in the event it locks or the like you can just hold the button on the case.
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  7. #37
    Low Bitrate scottholmes's Avatar
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    Yep, J8 to the m2 as planned but I could use the case power to control the external off, that would suit me just fine I think!

    Scott

  8. #38
    Raw Wave
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    Quote Originally Posted by gaoes View Post
    ... both relays will normally be de-energized to cut down on mechanical wear...
    I wouldn't worry about that - the wear is negligible.

    I too thought wear - or rather, reliability - was an issue. But relays usually last millions of operations.

    (I re-realised that recently when admiring the "fail-safe" fan wiring on my mum's car. Instead of an NO switch closing to energise a relay to power the fan, it's an NC switch that opens when over-temp. The NC energises an SPDT relay whose NC (87a) contact powers the fan. Hence if the circuit goes open, or the relay fails, or seizes in its "normal" position, the fan is on by default. It's been working fine for over 20 years. So now I might implement an NO oil-pressure switch system...)


    There is also the argument that a relay's NO contact/s should be the ones to connect power for "critical" items since the NC contact is more prone to bounce with vibration.
    Also for higher currents, being energised should mean a higher contact force/pressure for better conductivity etc. (Notice that NC contacts are often rated lower than the NO?)

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