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Interference between extruder motors and PT100

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Duet Hardware and wiring
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  • undefined
    Veti @o_lampe
    last edited by 4 Feb 2021, 15:45

    @o_lampe said in Interference between extruder motors and PT100:

    What I always do, is twisting the stepper cables.

    or braiding them 4 way braid

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    • undefined
      Idir
      last edited by 4 Feb 2021, 17:27

      The factory sensor comes connected on a 3 wire configuration and sadly I can't access them because they are heavily encapsulated all the way though, but I can try grounding the extruder-hotend setup as suggested by @o_lampe. If that doesn't work I guess I'll try switching them for PT1000 since they seem more resilient. I'll update with the working solution if I get there for future reference.

      Thank for the quick response!

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      • undefined
        Phaedrux Moderator
        last edited by 4 Feb 2021, 17:58

        3 wire should be pretty resilient to interference. 4-wire is best, but 3 should be ok. Hopefully the grounding helps.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • undefined
          o_lampe
          last edited by 5 Feb 2021, 07:49

          @Idir
          there's still a chance, you have a broken sensor or bad solder joint. The connections between mainboard and daughterboard can also cause issues. Maybe the extruder draws too much current, it causes a brownout or huge voltagedrop on the daughterboards?

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          • undefined
            dc42 administrators
            last edited by 5 Feb 2021, 08:52

            Unfortunately, stepper motor cables generate interference in other wires that they run close to.

            Please post a photo of the PT100 daughter board so that we can see what revision it is. The newer boards have additional capacitors to help reject interference. It's possible to add capacitors to the older boards.

            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

            undefined 1 Reply Last reply 10 Feb 2021, 15:49 Reply Quote 0
            • undefined
              Idir @dc42
              last edited by 10 Feb 2021, 15:49

              @dc42

              Here's the picture of the boards. Sorry for the quality, but it's what I managed to get from mi client.

              PT100 Board 1 PT100 Board 2

              I have not been able to try yet grounding the head yet.

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              • undefined
                dc42 administrators
                last edited by dc42 2 Oct 2021, 15:58 10 Feb 2021, 15:57

                As the PT100 wires run close to any stepper motor wires for a substantial distance, then using shielded cable for the PT100 wires should solve it.

                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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                • undefined
                  Idir
                  last edited by 10 Feb 2021, 16:13

                  The PT100 wires and the extruders wires go through different cables (although I suspect they are not insulated) and are relatively separated, but the cables go through the same ducts for about 4-5 meters, so I guess that might be a problem. I don't have detailed photos of the cable arrangement, but here's an overall look of the machine in case is helpful.

                  camphoto_1932422408.JPG

                  undefined 1 Reply Last reply 10 Feb 2021, 16:16 Reply Quote 0
                  • undefined
                    Idir @Idir
                    last edited by 10 Feb 2021, 16:16

                    @Idir said in Interference between extruder motors and PT100:

                    The PT100 wires and the extruders wires go through different cables (although I suspect they are not insulated)

                    Sorry, I intended to say that they are probably not shielded. They are of course insulated and I've checked for any derivation.

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                    • undefined
                      hackinistrator
                      last edited by 10 Feb 2021, 21:49

                      2000 deg sounds more like a connection issue then interference .

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                      • undefined
                        Idir
                        last edited by 18 Feb 2021, 14:49

                        After fiddling everything for several hours I didn't manage to find a bad connection or to solve the problem. I ended up changing the sensors for thermocouple cartridges and after connecting them directly to the board they just work, so I guess that's the end the problem for now.

                        Thanks to everyone for the quick response and the help.

                        undefined 1 Reply Last reply 10 Feb 2022, 07:33 Reply Quote 1
                        • undefined
                          waruta @Idir
                          last edited by 10 Feb 2022, 07:33

                          @idir I've got an old BigRep 1.2 as well and wondering if I could ask you for some info as the local distributors/resellers are proving most unhelpful.

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