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    PSU Tripping when Powering on Printer, Possible Stuck Mosfet

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    Duet Hardware and wiring
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    • Superbrain8undefined
      Superbrain8
      last edited by Superbrain8

      Good Morning Folks,

      Got my hands on a Duet 3 6HC and a Duet 3 3HC earlier this week and had time to wire it up yesterday.

      Vin is a 24V 200W Meanwell PSU
      5V is externaly powered over a Meanwell 5V PSU
      VIN Out0 is not connected.

      Running on 3.5.0-RC2

      Powered it up this morning to verify everything where right.
      Overall no issues, no Sparks.
      After attempting a PID tune on the Hotend the PSU tripped.
      powering down the printer and having it sit unpowered for a bit caused it to power on again.

      After some digging the PSU tripped again but since then Printer refuses to power on again.
      Removing any load from the PSU gets it to start.
      Just having the 3HC connected works also fine.
      Removing any plugged in Device from the 6HC and powering it over 24V trips the PSU
      just powering it on 24V without 5V showed a slight glow on the Out3 Status LED

      Im somewhat in a lucky Position in owning a Thermal Camera and ive took a Video of the Mosfet for Out3
      Xinf_231231_094202_924.mp4

      Superbrain8undefined 1 Reply Last reply Reply Quote 0
      • Superbrain8undefined
        Superbrain8 @Superbrain8
        last edited by Superbrain8

        After some more digging around its only the Mosfet that gets Hot the Zenner Diode for the header too.
        in the Attached video you can see the Mosfet pulsing from the PSU resetting from the Overcurrent protection and tripping again
        measured reistance on the header is about 1 Ohm the header below about 1 MOhm

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        • Superbrain8undefined Superbrain8 marked this topic as a question
        • Superbrain8undefined
          Superbrain8
          last edited by

          Is there a chance to get the board RMAd?
          bought it 23.12.2023, arrived the 28th from Dold-Mechatronik

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          • Phaedruxundefined
            Phaedrux Moderator
            last edited by

            Please send an email to warranty@duet3d.com and CC your reseller. Include a link to this forum thread and the details of your original purchase. You'll receive a reply with a form to fill out.

            Z-Bot CoreXY Build | Thingiverse Profile

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            • Superbrain8undefined Superbrain8 has marked this topic as solved
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