Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Duet resetting when using air pump

    Scheduled Pinned Locked Moved
    Duet Hardware and wiring
    7
    38
    5.0k
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • dc42undefined
      dc42 administrators
      last edited by

      Can you provide photos of the wiring between the air pump and the Duet?

      Does the problem definitely go away if you disconnect the air pump and then go through the same sequence?

      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

      1 Reply Last reply Reply Quote 0
      • tomasfundefined
        tomasf
        last edited by

        @dc42:

        Can you provide photos of the wiring between the air pump and the Duet?

        Sure! Here's the pump side:

        Excuse the ugly blob of resistors! The diode is a 1N4007. The black/red wires are about 80 cm long and end up here, in FAN0, on the other side:

        @dc42:

        Does the problem definitely go away if you disconnect the air pump and then go through the same sequence?

        Yep. If I disconnect the pump from FAN0 and turn on the fan in DWC, Duet never resets.

        1 Reply Last reply Reply Quote 0
        • tomasfundefined
          tomasf
          last edited by

          @tomasf:

          Yep. If I disconnect the pump from FAN0 and turn on the fan in DWC, Duet never resets.

          And same thing if I connect a normal fan. It spins happily and Duet runs fine.

          1 Reply Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators
            last edited by

            Are you certain that the wire coming out of the right hand side of the diode isn't shorting against the motor casing? In the photo it looks as if it could be, but perhaps that's just because of the angle that it's taken from.

            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

            1 Reply Last reply Reply Quote 0
            • tomasfundefined
              tomasf
              last edited by

              @dc42:

              Are you certain that the wire coming out of the right hand side of the diode isn't shorting against the motor casing? In the photo it looks as if it could be, but perhaps that's just because of the angle that it's taken from.

              Yeah, it's just the angle.

              1 Reply Last reply Reply Quote 0
              • 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.

                1 Reply Last reply Reply Quote 0
                • 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.

                  1 Reply Last reply Reply Quote 0
                  • 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

                    1 Reply Last reply Reply Quote 0
                    • 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

                      1 Reply Last reply Reply Quote 0
                      • 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.

                        1 Reply Last reply Reply Quote 0
                        • 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.

                          1 Reply Last reply Reply Quote 0
                          • 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.

                            1 Reply Last reply Reply Quote 0
                            • 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.

                              1 Reply Last reply Reply Quote 0
                              • Dougal1957undefined
                                Dougal1957
                                last edited by

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

                                1 Reply Last reply Reply Quote 0
                                • 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

                                  1 Reply Last reply Reply Quote 0
                                  • 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.

                                    1 Reply Last reply Reply Quote 0
                                    • 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

                                      1 Reply Last reply Reply Quote 0
                                      • First post
                                        Last post
                                      Unless otherwise noted, all forum content is licensed under CC-BY-SA