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    Berd-Air to Duet3

    Duet Hardware and wiring
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    • garyd9
      garyd9 last edited by

      Can give some advice on wiring a Berd-Air pump to a Duet3 board. Should I attach the pump directory to one of the higher current connections (such as OUT2 or OUT3), or use a lower current connector (OUT4 - OUT7)?

      The kit I bought also comes with a "E-Z Switch" that appears to be some kind of opt-isolated PWM controller. (https://www.themakerhive.com/products/e-z-switch-pwm-controller)

      I'd like to keep the wiring simple, and I don't have any addition components (diodes, etc) that I've seen mentioned in some of the berd-air duet2 threads.

      Thank you
      Gary

      "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

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      • Danal
        Danal last edited by

        If you use the EZ switch, you don't need any diodes, etc. Also, the input side of the EZ switch can be driven by any output, including the ion.out pins. Were it me, I'd absolutely use that EZ switch, especially given that some of the alternatives could damage the Duet.

        So... do you need a wiring diagram? Or did the berd/ez come with one?

        Delta / Kossel printer fanatic

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        • garyd9
          garyd9 @Danal last edited by

          @Danal

          Not really needing a wiring diagram, but was just trying to better understand the wiring options given the large number of connection options on the duet3.

          I was also hoping that the EZ switch wouldn't be needed in order to simplify things. Two wires (direct) vs six (2 from the duet3 board, + 2 wires from the PSU, +2 wires from the EZ switch to the pump.)

          "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

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          • Dougal1957
            Dougal1957 last edited by

            Gary did you get a 12V or 24V system?

            garyd9 1 Reply Last reply Reply Quote 0
            • garyd9
              garyd9 @Dougal1957 last edited by

              @Dougal1957 Ordered 24V (to match the rest of my system.)

              "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

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              • gtj0
                gtj0 last edited by

                All of the OUT connectors except OUT0 have flyback diodes so they're at least protected from back-EMF. OUT4-9 can provide about 2.5A of Vin each so it depends on what the pump draws. OUT1-3 can obviously handle more. Does the pump itself accept a PWM Vin and are you planing to vary the speed of the pump?

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                • garyd9
                  garyd9 @gtj0 last edited by garyd9

                  @gtj0 said in Berd-Air to Duet3:

                  Does the pump itself accept a PWM Vin

                  I'm assuming so, but I really don't know. I ordered the pump from 'themakerhive.com' as part of a kit: https://www.themakerhive.com/products/berd-air-max

                  and are you planing to vary the speed of the pump?

                  I absolutely intend to vary the speed of the pump. My understanding is that 100% on the berd air is incredible overkill for part cooling (as well as being noisy.)

                  All of the OUT connectors except OUT0 have flyback diodes so they're at least protected from back-EMF.

                  Can you confirm this? The wiki page here: https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Wiring_Diagram implies that only OUT7-9 have flybacks built in

                  "I'm not saying that you are wrong - I'm just trying to fit it into my real world simulated experience."

                  gtj0 1 Reply Last reply Reply Quote 0
                  • Danal
                    Danal last edited by

                    This MIGHT work on various Duet outputs that can supply current that the pump needs, and have proper protection. It MIGHT damage the board.

                    Me, I'd go with the included switch every time. I'm not willing to risk a several hundred dollar board for not having to connect two extra wires. And, the makers of that pump included the switch for a reason...

                    YMMV, of course.

                    Delta / Kossel printer fanatic

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                    • Dougal1957
                      Dougal1957 last edited by

                      Gary

                      What I can tell you is that my pump (Chinese one but suspect the same) works fine on PWM and in fact I never need to run it above 25% so far.

                      I would measure the coil resistance (preferably at multiple positions of the motor rotation) take the lowest reading you get and calculate the possible inrush current (V/R will give the current) and as long as this is well within the Duet capability you should be fine but as you have the EZSwitch (which is effectively just a opt isolated misfit) then it is worth using that as Danal says just to add an extra layer of protection. You can keep the switch close to your Duet and PSU to keep the wiring to a minimum and it won't hurt to put a flyback diode on the pump even if there is one fitted to whatever is driving it!

                      HTH

                      Doug

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                      • gtj0
                        gtj0 @garyd9 last edited by

                        @garyd9 https://github.com/Duet3D/Duet3-Mainboard-6HC/blob/master/Duet3_Mainboard_v0.6/Duet3_MB_schematic_v0.6.pdf
                        shows the flyback diodes.

                        As others have said though, the EZSwitch is cheap insurance.

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