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    Protecting the board from heater short

    Duet Hardware and wiring
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    • paboman
      paboman last edited by

      Hi,
      every heater cartridge has 2 little wires that can brake and touch the block or the user can accidentali touch them with a tool during nozzle replacement causing a short.

      Is it possible to protect the mosfet from burning by adding a fuse ?

      With a 40W 24v heater element what fuse rating should I use ?

      Fast blow or slow ?

      thx

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

        A 2A quick blow fuse would protect against fire, but would not necessarily protect the mosfet.

        However, the nozzle should not be changed while the printer is powered up.

        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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        • paboman
          paboman last edited by

          The nozzle should be changed while hot as long as i know, otherwise is very hard to unscrew.

          I now we can heat the nozzle then turn off the heater and unscrew the nozzle but as you know some user may forget to turn the heater off 🙂

          mickey30m 1 Reply Last reply Reply Quote 0
          • mickey30m
            mickey30m @paboman last edited by

            @paboman Than you not have the knowledge to change a nozzle.....
            😉

            its like the electrician in you're house, when you change a fuse.
            you know that you do something that is important

            paboman 1 Reply Last reply Reply Quote 0
            • paboman
              paboman @mickey30m last edited by

              @mickey30m maybe...I do not know a lot of things 🙂

              till now I have always heated the nozzle in order to be able to unscrew it without breaking the heatbreak (the E3D)

              Do You change nozzle at room temp ?

              mickey30m 1 Reply Last reply Reply Quote 0
              • mickey30m
                mickey30m @paboman last edited by

                @paboman when i need to change it.

                I do 220 C hotend and extrude some filament And then remove my filament. Then i disconnect everything and losen my nozzle while i hold my heater block.

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                • paboman
                  paboman last edited by

                  cant see any difference between our methods...you heat the hotend also and I also turn off the heater after reaching the temp.

                  1 Reply Last reply Reply Quote 0
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