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    Will 12v fan on 24Vin blow up the board?

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    Duet Hardware and wiring
    fans setup mosfet pwm control
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    • pro3dundefined
      pro3d
      last edited by

      As subject says. I forgot to replace the fan and after power up there was something blowing up

      The 12v fan was connected to F0 and my vin is 24v 10A

      What kind of damage am I looking at? Mosfets only? More damage?
      Will all the pwm ports be affected by this?
      Are drop downs ok to use here?

      All pwm fans are now not controlled anymore but just always on full speed

      Valkyrie DIY High Temp 3D Printer

      R&D - Engineering Designer - Viking 3D Printers
      https://vkingprinter.com/

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      • dc42undefined
        dc42 administrators
        last edited by

        The only components likely to have been damaged are the mosfets and of course the fan.

        You mustn't use drop downs on the fan outputs (other than the always-on fan output), however you can remove the fan voltage select jumper and feed 12V into the centre pin in order to use 12V fans. However, 24V fans are readily available,.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • pro3dundefined
          pro3d @dc42
          last edited by

          @dc42
          Thanks for the response! Not many radial 4020 blowers on 24v

          But can connecting wrong fan to one port destroy all of the FAN outs?

          Followup question
          I also connected the bl touch before making it 3.3v ready --- Are more components now dead?

          Valkyrie DIY High Temp 3D Printer

          R&D - Engineering Designer - Viking 3D Printers
          https://vkingprinter.com/

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          • dc42undefined
            dc42 administrators @pro3d
            last edited by dc42

            @pro3d said in Will 12v fan on 24Vin blow up the board?:

            @dc42
            Thanks for the response! Not many radial 4020 blowers on 24v

            But can connecting wrong fan to one port destroy all of the FAN outs?

            Shorting one fan output can damage a trace on older Duets, or blow the 1A fuse on revision 1.03 Duets. But in that case, the fans won't run at all.

            Followup question
            I also connected the bl touch before making it 3.3v ready --- Are more components now dead?

            Unlikely. We can't guarantee it, but the endstop and Z probe inputs will generally tolerate a lot of over-voltage without damage.

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

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