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Unresolved Printer restarts on full accessory load

Discussion in 'Troubleshooting' started by Marquis Johnson, Jul 17, 2016.

  1. Marquis Johnson

    Marquis Johnson Active Member

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    I just built a 6-way transistor board so I could control each individual fan and the RGB lights on my printer. Everything works when I request the function from my LCD controller, but as soon as I ask for all fans and lights to reach max load the Arduino restarts.

    If I take two fans off the board and just power them from a 12v rail everything functions normally.

    I know this is an issue caused by modification, but I have run out of ideas to try, so I thought I'd ask the forum.

    @TomerO I think you might be able to give some good insight on this
    Optimized-20160717_094432.jpg
     
    #1 Marquis Johnson, Jul 17, 2016
    Last edited: Jul 17, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I assume this is in-line with the 12v to the arduino. Is it only using one of the 12v rails or both?
     
  3. Marquis Johnson

    Marquis Johnson Active Member

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    Well the power supplying the transistors is straight from the power supply.
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    More concerned about a blip on the line that supplies power to the Arduino. There are two rails into the RAMPS. A 5amp and an 11amp.
    The 11 drives the output FETS (bed power and extruder power) the 5 one drives pretty much everything else.
    It could be you are causing enough of a momentary load to sag the one rail. If it were the extruder or bed heater ... not an issue, but the power to VCC on the arduino Mega -- yea.
     
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  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Fans have a fairly stout startup current surge and that can sag the P/S rail just a bit. A larger P/S is another alternative, but try swapping rails first.

    EDIT: worst case split them between rails :)
     
    #5 mark tomlinson, Jul 17, 2016
    Last edited: Jul 17, 2016
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  6. Marquis Johnson

    Marquis Johnson Active Member

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    Thanks for the suggestions. I'll have to do some tinkering to see what I can get to work.
     
  7. Ben Fralin

    Ben Fralin New Member

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    Marquis

    Have you found the solution to your problem?

    Ben
     
  8. Marquis Johnson

    Marquis Johnson Active Member

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    Not yet. I'm sure if I apply what some people have been saying on the YouTube video, I can get it resolved.
     

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