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    duet 3 wiring for fans

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    • Gioundefined
      Gio
      last edited by

      I need help with wiring duet 3.
      I need 5v for hotend fan, 12v for fan case and 24v for print cooling.
      I have the Mainboard as it arrived, I have not changed the jumpers.
      I have 12v on out4-out6 and 24v on out7-out9.
      The out4-out6 outputs are always on even though I have only configured the out4 and I cannot control the fan, always at maximum.
      So I need 5v but seems i can't have it, the fan is really small (25x25x7 mm), I need to control the fans on out4-out6 but I don't know how and last I need 24v for stripeled (I can use one out for fans example out9?)
      Thanks.

      A Former User? 1 Reply Last reply Reply Quote 0
      • A Former User?
        A Former User @Gio
        last edited by

        @Gio said in duet 3 wiring for fans:

        So I need 5v but seems i can't have it

        you will have to follow the Using 12V fans when VIN is 24V guide for the Duet 2 but instead of providing a 12v source you'll need to provide a 5v source. (or try to get a 12v fan instead ofc)

        Gioundefined 1 Reply Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          5v has the added disadvantage that shorting it to a higher voltage accidentally can fry your board. If possible you should try to standardize your fans to either 12v or 24v. 12v fans are far more plentiful.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • A Former User?
            A Former User
            last edited by

            Good call on the safety aspect! ☝

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            • Gioundefined
              Gio @A Former User
              last edited by

              @bearer
              Thanks I will follow that link.
              So i need one buck regulator.

              Any idea why all out4 to out6 are always on at 100%?

              @Phaedrux
              I looked for a fan with the same dimensions and characteristics at 12v but it is not found.

              Tahnks.

              A Former User? 1 Reply Last reply Reply Quote 0
              • A Former User?
                A Former User @Gio
                last edited by

                @Gio said in duet 3 wiring for fans:

                So i need one buck regulator.

                its better to use a buck regulator with a fuse; but you can use any 5v pin as all the switching is done on the low side.

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                • dc42undefined
                  dc42 administrators
                  last edited by dc42

                  Here's a 12V one https://www.ebay.co.uk/itm/162370304820. Lots more if you search for "2507 fan 12v".

                  Regarding out4 to out6, a 2 wire fan has to be connected between the VOUTLCn (+ve) and OUTn (-ve) pins of the fan connector.

                  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

                  Gioundefined 1 Reply Last reply Reply Quote 0
                  • Gioundefined
                    Gio @dc42
                    last edited by

                    @dc42
                    Thanks for the link.
                    out4-out is always on (output 12v on VOUTLCn (+ve) always on out not configured in the config.g).
                    I wired the fan as you indicated.

                    @bearer
                    Thanks.

                    1 Reply Last reply Reply Quote 0
                    • Gioundefined
                      Gio
                      last edited by

                      @dc42 said in duet 3 wiring for fans:

                      2507 fan 12v

                      This "2507 fan 12v" help me!!! bought some fans but now I have to solve the problem on out4-out6.
                      I unplugged everything and only gave power and continue to give 12v on all ports, even if not configured.

                      deckingmanundefined 1 Reply Last reply Reply Quote 0
                      • deckingmanundefined
                        deckingman @Gio
                        last edited by

                        @Gio PWM switches the negative side of the fans so the positive side will always show the selected fan voltage.

                        Ian
                        https://somei3deas.wordpress.com/
                        https://www.youtube.com/@deckingman

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                        • Gioundefined
                          Gio
                          last edited by

                          @deckingman
                          Thanks, I'm an idiot!!!! Now I understand. I used pin 1 (OUT 4 GND) as a negative!
                          Sorry me.
                          Thanks.

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