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    Duet resetting when using air pump

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    Duet Hardware and wiring
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    • tomasfundefined
      tomasf
      last edited by

      Yesterday, I tried connecting the pump to an always on fan port. Same thing happened; Duet reset after a few seconds (after turning on ATX power, of course). So at least we know it's unrelated to the fan MOSFETs.

      I ordered a replacement pump a few days ago. Free but slow shipping, so it'll take a while before I can test it.

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      • tomasfundefined
        tomasf
        last edited by

        So my new pump arrived. The very same kind. I soldered on the diode and connected it and… same thing. Duet resets.

        If I connect the pump directly to the 24V output of the supply, Duet resets. However, if I also disconnect Duet's VIN+GND terminals so that the pump is alone on the higher voltage, Duet does not reset. Re-connecting the high-power GND terminal restores the previous behaviour. I'm not sure what to make of this.

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        • fmaundefined
          fma
          last edited by

          Is the motor close to the Duet? It might be an interference issue when the motor runs.

          Did you try to use a separate power supply, and drive it through a FET?

          Frédéric

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          • dc42undefined
            dc42 administrators
            last edited by

            Is the metal casing of the pump motor in contact with anything?

            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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            • tomasfundefined
              tomasf
              last edited by

              @fma:

              Is the motor close to the Duet? It might be an interference issue when the motor runs.

              Did you try to use a separate power supply, and drive it through a FET?

              The motor is currently outside the printer frame with a ~15 cm cable. Before, I used a 60+ cm wire and the pump far outside the printer with the same result.

              I have tried using a separate supply operated manually, but not with a FET. Good idea, I should try that. I guess the two supplies would need a common GND connection. I just hope that connection doesn't spread whatever happens to the Duet again.

              It's so frustrating. If I only knew what's actually happening, I might be able to solve it. Now I'm just clueless.

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              • tomasfundefined
                tomasf
                last edited by

                @dc42:

                Is the metal casing of the pump motor in contact with anything?

                Nope. It's currently free on a wooden table, and normally it lives isolated in a plastic case.

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                • Alexander Mundyundefined
                  Alexander Mundy
                  last edited by

                  Gasping at straws here. Just out of curiousity, have you tried running it with the separate supply electrically isolated completely from the duet and it's supply? I don't understand how it could be, but that would only leave EMI as the cause.

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                  • tomasfundefined
                    tomasf
                    last edited by

                    @Alexander:

                    Gasping at straws here. Just out of curiousity, have you tried running it with the separate supply electrically isolated completely from the duet and it's supply? I don't understand how it could be, but that would only leave EMI as the cause.

                    Yeah, that's what I'm doing now, and it works fine.
                    My printer's power supply also works for the pump as long as Duet's VIN (or rather, the VIN GND) isn't connected to that supply, it seems.

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                    • Dougal1957undefined
                      Dougal1957
                      last edited by

                      that sound like a ground loop issue now you've said that

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        Do you have the Duet connected to as PC via USB as well?

                        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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                        • Alexander Mundyundefined
                          Alexander Mundy
                          last edited by

                          Check the polarity of each power supply input and also anything that is connected via a cable. Make sure that the intentionally grounded AC conductor (commonly called the neutral here in the US) is hooked to the power supplys as they should be. A reverse polarity on one could account for this.

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                          • dc42undefined
                            dc42 administrators
                            last edited by

                            What power supply are you using to drive the Duet and the pump 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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