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    Very strange behavior, CoreXY with external drivers

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    Duet Hardware and wiring
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    • Capricornundefined
      Capricorn @dc42
      last edited by

      @dc42

      M584
      Driver assignments: X5 Y6 Z7 E0:1:2:3:4, 3 axes visible

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        That looks OK too. So I think it's either very obscure firmware error or a short-circuit between those two signals (see my earlier message).

        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

        Capricornundefined 1 Reply Last reply Reply Quote 0
        • Capricornundefined
          Capricorn @dc42
          last edited by

          @dc42

          to clarify how my extern drivers are connected:
          all Step+/Dir+ from the ext. drivers go to +5V.
          all Step-/Dir- from the ext. drivers go to the corresponding pins on the breakout board

          dc42undefined jhonf441undefined 2 Replies Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @Capricorn
            last edited by dc42

            @capricorn said in Very strange behavior, CoreXY with external drivers:

            @dc42

            to clarify how my extern drivers are connected:
            all Step+/Dir+ from the ext. drivers go to +5V.
            all Step-/Dir- from the ext. drivers go to the corresponding pins on the breakout board

            That sounds good.

            Are you using G1 S2 moves (after sending G91 to select relative axis coordinates) to test the motors individually?

            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

            Capricornundefined 1 Reply Last reply Reply Quote 0
            • Capricornundefined
              Capricorn @dc42
              last edited by

              @dc42

              yes, i did, x and z go together and i can´t find a shortcut...
              i also tried to redirect z to drive 8 or 9. Same behavior...

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              • dc42undefined
                dc42 administrators
                last edited by

                1. Do any other motors move when you command the Y motor?

                2. Please check that you really do have +5V on the common 5V feed to the + inputs of the stepper drivers.

                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

                Capricornundefined 2 Replies Last reply Reply Quote 0
                • Capricornundefined
                  Capricorn @dc42
                  last edited by

                  @dc42

                  no other motors affected by moving Y.
                  the Voltage at the + inputs of the drivers is 4.56 V

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                  • Capricornundefined
                    Capricorn @dc42
                    last edited by

                    @dc42

                    meanwhile i tested another driver for z-motor (have more of them as spare) and also testet to set the
                    config to cartesian kinematiks. No luck, always x/z move together.... I´m frustrated....

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                    • Capricornundefined
                      Capricorn @Veti
                      last edited by

                      @veti

                      thank you, for your help, i´m just about cabling the printer. i can test it, when everything else is running.

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        Are you sure that the power to your external stepper drivers is stable? I am wondering whether when they are driving the motors, the voltage could be dropping.

                        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

                        Capricornundefined 2 Replies Last reply Reply Quote 0
                        • Capricornundefined
                          Capricorn @dc42
                          last edited by

                          @dc42

                          i test that... but i think so, cause i serve 5V to the board with a extern 50W power supply

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                          • Capricornundefined
                            Capricorn @dc42
                            last edited by Capricorn

                            @dc42

                            testet, konstant 4.45V. I take the 5V from the breakout board. Should i take it from the main board?
                            Or direct of the power supply?

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

                              @capricorn, I mean the main power to your external stepper drivers - 12V, 24V, 36V or whatever you are using.

                              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

                              Capricornundefined 2 Replies Last reply Reply Quote 0
                              • Vetiundefined
                                Veti
                                last edited by

                                @capricorn said in Very strange behavior, CoreXY with external drivers:

                                i test that... but i think so, cause i serve 5V to the board with a extern 50W power supply

                                how do you wire the two power supplies? i think the negative needs to be connected between the two, but i am not 100% sure.

                                Capricornundefined 1 Reply Last reply Reply Quote 0
                                • Capricornundefined
                                  Capricorn @dc42
                                  last edited by Capricorn

                                  @dc42

                                  konstant 41V motors driving , i´m using a 600W power supply

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                                  • Vetiundefined
                                    Veti
                                    last edited by

                                    i dont think 41v is supported

                                    https://duet3d.dozuki.com/Wiki/Choosing_the_power_supply

                                    The Duet 2 (Wifi and Ethernet) work with a VIN supply of between 11V and 25V

                                    Capricornundefined 1 Reply Last reply Reply Quote 0
                                    • Capricornundefined
                                      Capricorn @Veti
                                      last edited by

                                      @veti
                                      i don´t think so....

                                      Vetiundefined 1 Reply Last reply Reply Quote 0
                                      • Capricornundefined
                                        Capricorn @Veti
                                        last edited by

                                        @veti

                                        this is the power for the external motor drivers, not to the duet2

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                                        • Vetiundefined
                                          Veti @Capricorn
                                          last edited by

                                          @capricorn

                                          please draw a diagram. this is getting confusing.

                                          including all power supplies and the wires between them.

                                          Capricornundefined 1 Reply Last reply Reply Quote 0
                                          • Capricornundefined
                                            Capricorn @Veti
                                            last edited by

                                            @veti
                                            that´s easy.

                                            12V and 5V go to the duet2
                                            41V go to the external motor drivers

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