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    3wire fans on 1LC

    My Duet controlled machine
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    • PaulHew
      PaulHew last edited by PaulHew

      So as well as upgrading from a Duet2 eth +Duex 5 to Duet3 Mini + 1LC, I had to replace my 24v fans with 12v ones and thought I would get the 3 wire fans as they were out of stock of 2.

      My part cooling fan is a Delta bfb0512hh-f00 . red, black and a blue wire.
      I have looked for the past day trying to understand how to wire them in.

      Read this countless times.

      Red (or yellow, if there is no red wire) and black wires: connect them to the + and - pins respectively of an always-on fan connector.
      
      Blue wire (PWM control): connect it to the FAN- pin of your chosen controlled fan connector.
      

      So I presume I have the wrong fan and cannot read the speed of the fan, needs to be a 4 wire?
      If so, is the following correct? Do not fancy blowing up a new board(s) 🙂

      Wiring the part cooling fan to the 1LC into Out1, Is this correct?
      Red wire goes to "out1. 12v"
      Black to out1.Gnd
      Blue to out1.out1

      And the Tool cooling fan
      Red to out2.12v
      Black and Blue to out2.out2

      Its a 2 wire!

      Thanks in advance.
      Feel like a newbie again and I only changed a board or 2!

      Regards,
      Paul.

      RailCore II - Duet Mini + 1LC, Voron V0.1 - Duet Mini
      Voron 2.4 disassembled..... Waiting for the RailCore Mini....

      oliof dc42 2 Replies Last reply Reply Quote 0
      • oliof
        oliof @PaulHew last edited by

        @PaulHew i have wired up a 3 wire noctua fan where the third wire reports RPM to the 1LC. That machine is currently down for mechanical maintenance, but the fan definition is

        M950 F1 C"10.out2+out2.tach" Q5000                 ; create fan 1 on pin out2 and set its frequency, and tacho output on out2.tach
        M106 P1 S1 H1 T45                                     ; set fan 1 value. Thermostatic control is turned on
        

        I hope that helps.

        Best,
        Harald

        <>Creality CR-20 IDEX Duet3 mini 5+<>RatRig V-Minion SKR RRF 1.1<>

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        • dc42
          dc42 administrators @PaulHew last edited by

          @PaulHew said in 3wire fans on 1LC:

          Wiring the part cooling fan to the 1LC into Out1, Is this correct?
          Red wire goes to "out1. 12v"
          Black to out1.Gnd
          Blue to out1.out1

          No. For a 3-wire fan it should be:

          Red -> out1_12V+
          Black -> out1_neg
          Blue -> out1_tacho

          The tacho will only read correctly when the fan is running at full PWM.

          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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