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    1 Amp fuse Blowing

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    Duet Hardware and wiring
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    • oddjobundefined
      oddjob
      last edited by

      Hi All,

      I made an error on a new build with polarity crossed and blew the 1 and 7.5 amp fuses. I corrected the issue and I'm now having an issue with the 1 amp fuse blows under heater load. It's a dual extruder (converted Cubex Duo) which I'm I am running 2 x E3D V6 hotends. I find I am able to Auto tune the heaters on the hotends, however when I try to heat a tool the 1 amp fuse blows. Any pointers greatly appreciated.

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      • Vetiundefined
        Veti
        last edited by

        the 1amp fuse is for the fans.

        does the fuse still blow if you disconnect all the fans?

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        • oddjobundefined
          oddjob
          last edited by

          Hi Veti,

          Thanks for your input. Unfortunately yes the 1 Amp fuse blows even if the fans are disconnected. I've also connected the fans to the always on an they seem to function correctly.

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          • Vetiundefined
            Veti
            last edited by

            and all fan outputs work fine before heating?

            oddjobundefined 1 Reply Last reply Reply Quote 0
            • oddjobundefined
              oddjob @Veti
              last edited by

              @Veti

              I've not checked the fan outputs. I have checked the fans operate on the always on outputs and they were fine. The fans also work when I auto tune the Hotends.

              The fuse blows when I request heat to be applied to the hotend whether from manual input or from running the preheat macro.

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              • oddjobundefined
                oddjob
                last edited by

                Hi Again Veti,

                I've not checked the fan outputs. I have checked the fans operate on the always on outputs and they were fine. The fans also work when I auto tune the Hotends.

                The fuse blows when I request heat to be applied to the hotend whether from manual input or from running the preheat macro.

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                • Vetiundefined
                  Veti
                  last edited by

                  my thought was along the lines of the pwm fan mosfet being blown. and when for example the part cooling fan turns on, it creates a short circuit.

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                  • oddjobundefined
                    oddjob
                    last edited by

                    Thanks for the insight really appreciated, I'll look at testing the mosfet.

                    dc42undefined 1 Reply Last reply Reply Quote 0
                    • dc42undefined
                      dc42 administrators @oddjob
                      last edited by

                      Are you certain that you didn't get the fuses swapped? Turning a heater on shouldn't blow the fan fuse.

                      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

                      oddjobundefined 1 Reply Last reply Reply Quote 0
                      • oddjobundefined
                        oddjob @dc42
                        last edited by

                        @dc42 Yes, absolutely correct fuses swapped, now running fine. Thanks for your insight, very much appreciated.

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