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    Duet WiFi fan confusion

    Duet Hardware and wiring
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    • Asdasd1234
      Asdasd1234 last edited by

      Hi all,

      I'm trying to get a fan working to go into the housing for the Wifi board. but I only need it running at half speed if that (its a pretty beefy fan for its job)

      It's a 4 wire 12v fan.

      I've connected just the Vin and ground to the FAN1 connector on the board.

      I can only make it turn on with this command "M106 P1 I1" The I1 part is needed or it doesn't work. And S0.1-1 or S50/S100/S255 have no affect on speed.

      How do I slow down this fan?

      All help appreciated!

      Many Thanks

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      • dc42
        dc42 administrators last edited by

        Connect the red and black wires to an always on fan connector, and the PWM wire to the FAN- pin of your chosen fan connector. Use parameter I1 innthe M106 command to invert the polarity.

        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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        • Asdasd1234
          Asdasd1234 last edited by

          I'll try that and report back, cheers!

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          • biscuitlad
            biscuitlad last edited by

            Isn't P1 defined to be a thermostatically controlled by default? You need to disable it first:

            M106 P1 H-1

            Then send your variable rate.

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