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    24V Pump - can I connect direct?

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    Duet Hardware and wiring
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    • Hergonowayundefined
      Hergonoway @dc42
      last edited by Hergonoway

      @dc42

      Based on your recommendations, is the schematic below the right one for connecting an air pump directly to the Duet ?

      alt text

      Delta goes BrrrRRRRrrrrrRRRRrrr

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        Yes it is. The flyback diode is optional if the Duet is revision 1.02 or later, but having one close to the motor will help to reduce any interference generated when you PWM the motor.

        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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        • SM3Dundefined
          SM3D
          last edited by SM3D

          @dc42 and @benkay just wanted check with both of you my wiring before connecting to my duet 1.01. I followed the post and wired the pump accordingly. Here are the pictures:

          0_1527328363356_20180526_113737.jpg

          0_1527328376989_20180526_113747.jpg

          Please let me know whether it is correct or not. I surely do not want to blow my Duet.

          Cheers,
          Vasan

          Good judgement comes from experience but experience comes from bad judgements

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          • Hergonowayundefined
            Hergonoway @SM3D
            last edited by Hergonoway

            @sm3d seems correctly set

            Delta goes BrrrRRRRrrrrrRRRRrrr

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            • SM3Dundefined
              SM3D
              last edited by

              Thanks @Hergonoway will update whether berd air is effective or not

              Cheers,
              Vasan

              Good judgement comes from experience but experience comes from bad judgements

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              • benkayundefined
                benkay
                last edited by

                Looks correct to me...although I understand that the later boards have the diode in-built so not strictly necessary to add one there.

                Tevo Little monster with Duet Wifi and Smart Effector / magball arms upgrades.
                Original Prusa i3 Mk3

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                • Hergonowayundefined
                  Hergonoway @SM3D
                  last edited by

                  @sm3d In my case, putting the thermistor didn't closed the circuit as it should, so for now and until @dc42 finish his tests regarding what should be used I don't use the thermistor. For info I'm running the air pump MAX in 24v sold by makerhive.

                  Delta goes BrrrRRRRrrrrrRRRRrrr

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                  • SM3Dundefined
                    SM3D
                    last edited by

                    @Hergonoway I have trouble running the pump with thermistor from PWM controlled fan ports but I could run them with always on fan ports. Here is my post about it:

                    https://forum.duet3d.com/topic/5449/not-able-to-pwm-for-berd-air-pump/10

                    I even shorted the legs of thermistor and tried from PWM fan ports but no luck. If you have any ideas please post it.

                    Cheers,
                    Vasan

                    Good judgement comes from experience but experience comes from bad judgements

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                    • BenDieselundefined
                      BenDiesel
                      last edited by

                      So I have a 24v berdair hooked directly up. I usually run at 25 to 30% and have the Pam set to 255khz.
                      The motor get rather warm. Almost to hot to tuch. Should I be concerned?

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                      • Hergonowayundefined
                        Hergonoway
                        last edited by Hergonoway

                        255K is way to high try 25K (F25000). In my case the sound and the temp dropped a lot.

                        Note that I've directly connected the 1/8" ID Tygon tube to the metal tube, it reduce pressured area and reduce heat from the pump mechanism (the white plastic part)

                        Delta goes BrrrRRRRrrrrrRRRRrrr

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