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    topic_solved 12v fan for hotend help needed

    Duet Hardware and wiring
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    • StevenL
      StevenL last edited by

      OK. having an issue with getting 12v from Port 3 on the Duet5 for the new 12v Noctura Fan. This is an always on fan for the hotend.
      According to this: https://www.instructables.com/id/Duex5-Use-Build-in-12v-Switching-Regulator-on-24v-/
      But I dont have the PIN 1 shown in the instructable. I have the latest duet5 board which does not have spot 1.

      I enter M106 P3 S1 and nothing happens.
      obviously i'm missing something.

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      • aidar
        aidar last edited by

        I dont have Duex, but from pictures there seems to be another jumper located between middle endstop and termistor connectors. Ist this for selecting 12v ?

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        • dc42
          dc42 administrators last edited by dc42

          See https://duet3d.dozuki.com/Wiki/Duex_wiring_diagrams. On the latest DueX boards, the INT_12V_EN jumper has been moved to the middle left hand edge of the board in that diagram.

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          • StevenL
            StevenL last edited by StevenL

            I did find the 12v enable pins on the left side. I placed a jumper on it and still nothing.
            Not sure what I'm doing wrong. Would I be better off just using a DC-dc buck down converter (24v to 12v) off the original hotend fan pins ?

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            • StevenL
              StevenL last edited by

              any ideas ?

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              • dc42
                dc42 administrators last edited by

                Next to that jumper there is a 12V OUT connector. Do you measure 12V across its pins? Take great care not to short the pins together while you measure it.

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                • StevenL
                  StevenL last edited by

                  This issue was I needed an S parameter. The 12v was enabled, but at a default 0 speed. so the fan was essentially off. I set M106 P8 S255 and the fan went on full.

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                  • bot
                    bot @StevenL last edited by bot

                    @stevenl you had the S parameter in your original post... maybe S1 doesn't work as it should? Or were you accidentally commanding P3 when the fan was actually connected to P8?

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                    • StevenL
                      StevenL last edited by

                      S1 needs to be S255

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                      • bot
                        bot last edited by

                        S1 and S255 result in the exact same behaviour.

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