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    M950 K param for lower fan speed setting

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    • gnydickundefined
      gnydick
      last edited by gnydick

      I have a fan with tacho that has 2 pulses per revolution and it's a 7,000 rpm fan. when I put it at half speed it shows 21,000 rpm.

      Is it possible in a future version to use the K value to calculate lower speeds? I would have thought that was the purpose in the first place.

      droftartsundefined 1 Reply Last reply Reply Quote 0
      • droftartsundefined
        droftarts administrators @gnydick
        last edited by

        @gnydick Is it a 3- or 4-wire fan? 3-wire fans only show the correct rpm at full speed, because they should really be controlled with a variable voltage, not PWM. PWM messes up the tacho reading.

        Ian

        TronXY X5S with Duet 3 MB6HC and Roto toolboard : Cartesian bed-slinger with Duet 3 Mini 5+ WiFi and 1LC : RRP Fisher Delta v1 with Duet 2 Maestro : Polargraph with Duet 2 WiFi

        gnydickundefined 1 Reply Last reply Reply Quote 0
        • gnydickundefined
          gnydick @droftarts
          last edited by

          @droftarts I found that I needed to change the pwm frequency, then it started working. thank you.

          1 Reply Last reply Reply Quote 0
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