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    Duet resetting when using air pump

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    Duet Hardware and wiring
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    • T3P3Tonyundefined
      T3P3Tony administrators
      last edited by

      The power MOSFET should protect the Duet from that sort of stuff. Are you running the pump.off a seperate supply.niw you are using an external supply? Another thing worth a try is switching fan pins to see if there is an issue with that particular fan channel.

      www.duet3d.com

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      • Alexander Mundyundefined
        Alexander Mundy
        last edited by

        That pump looks like the same one I'm using best I can tell from the pic. I have a small 12V 5A power supply for the pump and a 24V supply for everything else. Before I installed mine I tested on 24V and the instaneous power on spike was in the range of 3.2A and the pump ran really hot so I used a separate 12V supply. They (China) advertised 24/12V but running the numbers down on the motor itself led me to the conclusion that mines a 12V 550. I finally ran down what I think is the actual manufacturer.

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        • dc42undefined
          dc42 administrators
          last edited by

          It might be worth putting a power resistor in series with the motor to limit current surges. If its running current is about 0.5A then a value of 1 to 2 ohms should be about right.

          If the motor has a built-in capacitor for interference suppression, that would give rise to current surges when PWM is used - giving another reason to add the resistor.

          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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          • Dougal1957undefined
            Dougal1957
            last edited by

            David what sort of power rating would you suggest?

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            • T3P3Tonyundefined
              T3P3Tony administrators
              last edited by

              I have a 24V version of the same/similar pump and have not had any issues yet. I generally run it at 0.3-0.7 PWM.

              www.duet3d.com

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              • dc42undefined
                dc42 administrators
                last edited by

                @Dougal1957:

                David what sort of power rating would you suggest?

                The steady-state power dissipation @ 0.5A would be 0.25W for a 1 ohm resistor, or 0.5W for a 2 ohm resistor. So 1W or 2W should be adequate unless the motor stalls.

                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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                • Dougal1957undefined
                  Dougal1957
                  last edited by

                  @dc42:

                  @Dougal1957:

                  David what sort of power rating would you suggest?

                  The steady-state power dissipation @ 0.5A would be 0.25W for a 1 ohm resistor, or 0.5W for a 2 ohm resistor. So 1W or 2W should be adequate unless the motor stalls.

                  Thanks David hope to see you at TCT on the Wednesday

                  Doug

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                  • tomasfundefined
                    tomasf
                    last edited by

                    @dc42:

                    It might be worth putting a power resistor in series with the motor to limit current surges. If its running current is about 0.5A then a value of 1 to 2 ohms should be about right.
                    If the motor has a built-in capacitor for interference suppression, that would give rise to current surges when PWM is used - giving another reason to add the resistor.

                    Interesting. Thanks, I will try that tonight. I don't have any power resistors, but putting eight 0.25 W, 15 Ω resistors in parallel should work for now.

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                    • WalterSKWundefined
                      WalterSKW
                      last edited by

                      Just my thoughts : What's happening at that same moment in your printer.
                      I mean the sum of all currents has to be less or equal to the current the PSU can supply …
                      Could be a power dip too.

                      Brian once said: "Always look at the bright side of life"
                      Works for me!

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                      • Dougal1957undefined
                        Dougal1957
                        last edited by

                        also just for info I now have my pump connected and running on Fan0 connector set as a print fan and it works just fine and can adjust the speed from the Panel due as expected get masses of air thru the berd air tube now don't think I will ever have to run it at above 25% more likely 15-20 will be the sweet spot

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                        • tomasfundefined
                          tomasf
                          last edited by

                          @WalterSKW:

                          Just my thoughts : What's happening at that same moment in your printer.
                          I mean the sum of all currents has to be less or equal to the current the PSU can supply …
                          Could be a power dip too.

                          As far as I know, nothing else is happening. I first discovered this problem when trying to print, but turning the fan (pump) on manually in DWC is enough to reproduce the issue. The PSU capacity is ample. 600W should be enough for Duet and a pump 🙂

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                          • WalterSKWundefined
                            WalterSKW
                            last edited by

                            @tomasf:

                            600W should be enough for Duet and a pump 🙂

                            Unless your heater draws something like 595W, this should be sufficient indeed 😉

                            Brian once said: "Always look at the bright side of life"
                            Works for me!

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                            • dc42undefined
                              dc42 administrators
                              last edited by

                              Is the metal frame of the pump motor in contact with anything? Do the wires between the Duet and the motor run parallel with any other wires? I'm wondering if it could be an interference issue.

                              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

                                @tomasf:

                                @dc42:

                                It might be worth putting a power resistor in series with the motor to limit current surges. If its running current is about 0.5A then a value of 1 to 2 ohms should be about right. If the motor has a built-in capacitor for interference suppression, that would give rise to current surges when PWM is used - giving another reason to add the resistor.

                                Interesting. Thanks, I will try that tonight. I don't have any power resistors, but putting eight 0.25 W, 15 Ω resistors in parallel should work for now.

                                So I just tried this, and… no difference. 😞

                                @dc42:

                                Is the metal frame of the pump motor in contact with anything? Do the wires between the Duet and the motor run parallel with any other wires? I'm wondering if it could be an interference issue.

                                No, I have isolated the pump in a plastic shell. Same thing when it's laying bare on a [wooden] table. I have tried keeping the wires from being near anything else, and it doesn't make a difference.

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                                • 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

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                                  • 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.

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                                    • 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.

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                                      • 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

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                                        • 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.

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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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