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    Invert the logic of thermostatic control M106

    Duet Hardware and wiring
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    • Marcelocm1995
      Marcelocm1995 last edited by

      Hi, I have a duet2 wifi with last firmware. I configured thermostatic control for my chamber heater, but I need to turn on fan when heater is on too, and turn off fan when heater turn off.

      I have try this "M106 P1 T45 S0.2 H2", but works inverted of I want.

      Is there a way to change thislogic?

      Thanks.

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      • dc42
        dc42 administrators last edited by

        Can you wire the fan in parallel with the heater (if the heater is powered from VIN), or in parallel with the SSR input (if the heater is AC mains voltage)?

        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

        Marcelocm1995 1 Reply Last reply Reply Quote 0
        • Marcelocm1995
          Marcelocm1995 @dc42 last edited by

          @dc42 My heater is AC. I can do this (parrallel with the signal of SSR), but my heater uses bang bang control, I don't want use this metod, besides that my heater has a considerable overshoot.

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          • dc42
            dc42 administrators last edited by dc42

            Why not use PID for the heater? That would also reduce the overshoot.

            If you are using RRF3 then you can invert the fan output in the M950 command that sets up the fan port.

            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

            Marcelocm1995 1 Reply Last reply Reply Quote 0
            • Marcelocm1995
              Marcelocm1995 @dc42 last edited by

              @dc42 I will try PID. I haven't tried because here in Brazil we can't generate ripple in AC line
              (liable to a fine). I'm planning to migrate to RRF3.

              dc42 1 Reply Last reply Reply Quote 0
              • dc42
                dc42 administrators @Marcelocm1995 last edited by

                @Marcelocm1995 said in Invert the logic of thermostatic control M106:

                I haven't tried because here in Brazil we can't generate ripple in AC line

                What are the exact regulations? They may be referring to ripple caused by using phase angle controllers. If you use a zero-crossing DC-AC SSR (the most common sort) then the power control is burst-fire not phase-angle.

                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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