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Big pellet extruder; How to configure the servo motor?

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Duet Hardware and wiring
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  • undefined
    droftarts administrators @sbNielsen
    last edited by 5 Dec 2023, 11:47

    @sbNielsen said in Big pellet extruder; How to configure the servo motor?:

    @droftarts
    I just tried to put a multimeter between the step+ and step-, and I measured a constant 5V.
    5V when not cold extruding, and 5V when pressing extrude.

    That is expected, I think. See https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Mainboard_6XD_Hardware_Overview#connecting-external-motor-drivers

    The Step and Dir outputs from the 6XD are either low (when "on") or floating/high-impedance when "off".
    The Enable output is either low when "on" and high impedance when "off", or vice versa, depending on the position of the 'Driver Enable Polarity' (En_Pol) jumper.

    So it may be that the driver just need to be configured for this signal. Same for enable, depending on how you have set the jumper.

    Then I tried to measure the Hz frequency between the step+ and step-, and I could not register any - also not when pressing extrude.
    I thought I should be able to see the Hz on the meter when hitting extrude?

    That may be down to your multimeter, which may be expecting a sine wave rather than a PWM signal. Usually an oscilloscope is used to see the signal.

    Ian

    Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

    undefined 1 Reply Last reply 5 Dec 2023, 12:00 Reply Quote 0
    • undefined
      sbNielsen @droftarts
      last edited by 5 Dec 2023, 12:00

      @droftarts
      Ok, so far so good then.

      I have sent an email to Lichuan tech support now, hopefully they can find the issue.

      undefined 1 Reply Last reply 6 Dec 2023, 10:44 Reply Quote 0
      • undefined
        sbNielsen @sbNielsen
        last edited by 6 Dec 2023, 10:44

        @droftarts
        I spoke with the store who sold me the motor/driver, and they test each one before selling and usually the issue is on the control/Arduino/Duet side.

        I get a reading when sending M115 B122, so there is a connection to the 1XD.

        All my config.g numbers are within a reasonable/expected value, so that an extrude command from the Duet WC should cause some kind of motion.

        Could this be a fault on the 1XD board, failing to send the frequency? Does that ever happen?

        undefined 1 Reply Last reply 6 Dec 2023, 11:03 Reply Quote 0
        • undefined
          sbNielsen @sbNielsen
          last edited by 6 Dec 2023, 11:03

          @sbNielsen
          Another sign that there is activity on the CAN bus, is that when i press extrude I get a brief flash of green on the 1XD.

          So a signal is definitely sent from the 6HC and received by the 1XD

          undefined 1 Reply Last reply 6 Dec 2023, 12:05 Reply Quote 0
          • undefined
            droftarts administrators @sbNielsen
            last edited by 6 Dec 2023, 12:05

            @sbNielsen Have you tested both 1XD boards? I can imagine a fault on one board, but not on both. If you don't have an oscilloscope, you could wire an LED on each output (as the signalling is 5V), and see if they light up during the move (you may have to adjust the frequency to do this).

            Ian

            Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

            undefined 1 Reply Last reply 7 Dec 2023, 16:33 Reply Quote 0
            • undefined
              dc42 administrators @sbNielsen
              last edited by 7 Dec 2023, 15:05

              @sbNielsen did you wire the servo inputs like this from page 11 of the manual, with 1XD STEP+ and STEP- acting as PUL+ and PUL- respectively? If not, how did you connect them?

              821f26fb-341a-4666-9da1-a975c9cf000c-image.png

              Have you set valid parameters in this table from section 6.1.2 on page 19?

              95edb1b4-2428-40d2-ab0d-1630787587b8-image.png

              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
              • undefined
                sbNielsen @droftarts
                last edited by sbNielsen 12 Aug 2023, 09:18 7 Dec 2023, 16:33

                @dc42

                • did you wire the servo inputs like this from page 11 of the manual, with 1XD STEP+ and STEP- acting as PUL+ and PUL- respectively? If not, how did you connect them?

                Yes, thats how I wired it.

                • Have you set valid parameters in this table from section 6.1.2 on page 19?

                Yes. I had it in Position mode (external pulse control) P02-00:1 and P05-00:0. I also tried to change various other params to see if they were blocking - no luck.

                I spoke with the store I bought the motor from. They have not heard about this before, and puts the fault likelihood on the Duet.

                I just tested another external driver + stepper motor on the same 1XD board - this also failed.

                So it starts to look like an error with the 1XD.

                I have just ordered another one, and will test the new one as soon as it arrives.

                undefined 1 Reply Last reply 7 Dec 2023, 16:39 Reply Quote 0
                • undefined
                  droftarts administrators @sbNielsen
                  last edited by 7 Dec 2023, 16:39

                  @sbNielsen I know you updated the firmware on your 1XD, but looking back through the thread I can't see what version your 6HC is on. Can you send M122 and M122 B122 and post the results, just in case?

                  Ian

                  Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                  undefined 1 Reply Last reply 8 Dec 2023, 10:22 Reply Quote 0
                  • undefined
                    sbNielsen @droftarts
                    last edited by 8 Dec 2023, 10:22

                    @droftarts
                    Screenshot 2023-12-08 at 11.19.18.png

                    Yeah sure. They're both are up to date.

                    undefined 1 Reply Last reply 8 Dec 2023, 10:29 Reply Quote 0
                    • undefined
                      droftarts administrators @sbNielsen
                      last edited by 8 Dec 2023, 10:29

                      @sbNielsen Actually, they are not. Your main board 6HC is on a older beta release of 3.5, and your 1XD is on 3.4.6. Please either downgrade your 6HC to 3.4.6, or update both boards with the 6HC and 1XD firmware here, which is 3.5.0-rc.1++: https://www.dropbox.com/scl/fo/gaxzegafmnmagaefo9mgc/h?rlkey=hk4wpttdje76oews8zkuh86q3&dl=0

                      Ian

                      Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                      undefined 2 Replies Last reply 8 Dec 2023, 13:21 Reply Quote 0
                      • undefined
                        sbNielsen @droftarts
                        last edited by 8 Dec 2023, 13:21

                        @droftarts
                        Fs_UIs1WwAAZH5V.JPEG

                        My god... I updated both boards and now at least the external stepper driver/motor is responding!

                        Can't believe it, I had updated the 1XD to - what I tought was - the latest version exactly to avoid this.

                        Will try and plug in the servo and hopefully that will work too!

                        Haha great friday gift so far!

                        1 Reply Last reply Reply Quote 0
                        • undefined
                          sbNielsen @droftarts
                          last edited by 8 Dec 2023, 14:22

                          @droftarts
                          I just plugged the servo, and it works!

                          Thank you for the support!

                          1 Reply Last reply Reply Quote 1
                          • undefined sbNielsen marked this topic as a question 8 Dec 2023, 14:22
                          • undefined sbNielsen has marked this topic as solved 8 Dec 2023, 14:22
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