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

    Servo Configuration Check

    Scheduled Pinned Locked Moved
    Using Duet Controllers
    5
    34
    1.6k
    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.
    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      Please try M950 S1 C"!duex.pwm2" but without the !

      And you're for sure using the pwm2 header?

      Photo of your wiring?

      https://docs.duet3d.com/duet_boards/duet_2_expansion/duex_wiring_v0.11_d1.0.png

      Z-Bot CoreXY Build | Thingiverse Profile

      JRCLundefined 1 Reply Last reply Reply Quote 1
      • alankilianundefined
        alankilian @JRCL
        last edited by

        @jrcl

        Do you have the ground of the 5 Volt output connected to the ground on the Duet?

        If it's isolated then you would need the grounds tied together.
        (somewhat unlikely, but who knows)

        SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

        JRCLundefined 1 Reply Last reply Reply Quote 0
        • JRCLundefined
          JRCL @Phaedrux
          last edited by

          @phaedrux Tried without the ! and here is my wiring diagram and circled the pin on the duex to be safe. Still no dice.

          ca169737-604f-4789-b6e5-8fd98bdb6791-image.png

          314197a2-8d1c-4a17-91e3-acd6354495e6-image.png

          Phaedruxundefined 1 Reply Last reply Reply Quote 0
          • JRCLundefined
            JRCL @alankilian
            last edited by JRCL

            @alankilian just posted my abridged wiring diagram above. I don't think that's isolated, but maybe?

            fcwiltundefined alankilianundefined 2 Replies Last reply Reply Quote 0
            • fcwiltundefined
              fcwilt @JRCL
              last edited by

              @jrcl said in Servo Configuration Check:

              @alankilian just posted my abridged wiring diagram above. I don't think that's isolated, but maybe?

              Do you perhaps have an oscilloscope you could check the PWM signal with? It may not be meeting the requirements for your servo.

              Frederick

              Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

              JRCLundefined 1 Reply Last reply Reply Quote 0
              • JRCLundefined
                JRCL @fcwilt
                last edited by

                @fcwilt I don't unfortunately. I'm no electrical engineer, but could I use some sort of amplification module on the signal? Not sure if PWM signals work like that/or can be amplified like that.

                JRCLundefined fcwiltundefined 2 Replies Last reply Reply Quote 0
                • JRCLundefined
                  JRCL @JRCL
                  last edited by

                  @jrcl said in Servo Configuration Check:

                  @fcwilt I don't unfortunately. I'm no electrical engineer, but could I use some sort of amplification module on the signal? Not sure if PWM signals work like that/or can be amplified like that.

                  da2f591c-d87d-4f3a-8f9f-4687de2e1378-image.png

                  Managed to find the control signal specs. What are the PWM signals on the Duex able to supply?

                  1 Reply Last reply Reply Quote 1
                  • fcwiltundefined
                    fcwilt @JRCL
                    last edited by

                    @jrcl said in Servo Configuration Check:

                    @fcwilt I don't unfortunately. I'm no electrical engineer, but could I use some sort of amplification module on the signal? Not sure if PWM signals work like that/or can be amplified like that.

                    A PWM signal as used to drive a servo is a fixed frequency, typically 50 Hz, with a varying duty cycle.

                    While you could possible hear via an audio amplifier with suitable frequency range it wouldn't tell you if the signal met the needs of your servo.

                    You can get a fairly nice combo multimeter and oscilloscope which would do the job for $100 off of Amazon. A useful tool for working on 3D printers.

                    Frederick

                    Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                    1 Reply Last reply Reply Quote 0
                    • Phaedruxundefined
                      Phaedrux Moderator @JRCL
                      last edited by

                      @jrcl said in Servo Configuration Check:

                      @phaedrux Tried without the ! and here is my wiring diagram and circled the pin on the duex to be safe. Still no dice.

                      ca169737-604f-4789-b6e5-8fd98bdb6791-image.png

                      314197a2-8d1c-4a17-91e3-acd6354495e6-image.png

                      You've circled the PWM3 header, but the command you posted was for PWM2 M950 S1 C"!duex.pwm2"

                      Which is it?

                      Assuming it matches and it was just a typo, does the servo make any noise or get warm when you try and activate it?

                      Can you send M950 S1 by itself and report back the reply?

                      Can you try with some different PWM frequencies by adding a Q parameter to the M950 command?

                      M950 S1 C"!duex.pwm2" Q50 perhaps

                      Z-Bot CoreXY Build | Thingiverse Profile

                      JRCLundefined 1 Reply Last reply Reply Quote 0
                      • alankilianundefined
                        alankilian @JRCL
                        last edited by

                        @jrcl

                        Can you post the manufacturer and part number for your 24-to-5 Volt converter?

                        SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                        JRCLundefined 1 Reply Last reply Reply Quote 0
                        • JRCLundefined
                          JRCL @Phaedrux
                          last edited by

                          @phaedrux Are they not grouped like this? I figured it was just a naming convention for the pin (E3_PWM) went with the PWM number (PWM2) and I saw this on the pin name table too and thought I still called C"duex.pwm2" though the control pin is called E3_PWM

                          e7b3ea11-3108-45de-8af5-3b33086f9f8d-image.png
                          2606dcdd-c578-49a6-b5bd-0d4798f527dd-image.png

                          Phaedruxundefined 1 Reply Last reply Reply Quote 0
                          • JRCLundefined
                            JRCL @alankilian
                            last edited by

                            @alankilian Tobsun EA75-5V

                            alankilianundefined 1 Reply Last reply Reply Quote 0
                            • alankilianundefined
                              alankilian @JRCL
                              last edited by

                              @jrcl

                              I can't tell if that's isolated or not.

                              If you've got everything else figured out, try connecting the two grounds together at the converter.

                              SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                              fcwiltundefined 1 Reply Last reply Reply Quote 0
                              • fcwiltundefined
                                fcwilt @alankilian
                                last edited by

                                @alankilian said in Servo Configuration Check:

                                @jrcl

                                I can't tell if that's isolated or not.

                                If you've got everything else figured out, try connecting the two grounds together at the converter.

                                Without knowing how the unit is designed that might be unwise.

                                Frederick

                                Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                                JRCLundefined alankilianundefined 2 Replies Last reply Reply Quote 0
                                • JRCLundefined
                                  JRCL @fcwilt
                                  last edited by

                                  @fcwilt Agreed, it's a buck converter if that makes any difference, but it does seem like that would allow the full power load to pass through the Duex and potentially fry the rail. Ordering the recommended MG995, from the servo wiki, to test against at least for now.

                                  fcwiltundefined 1 Reply Last reply Reply Quote 0
                                  • fcwiltundefined
                                    fcwilt @JRCL
                                    last edited by

                                    @jrcl said in Servo Configuration Check:

                                    @fcwilt Agreed, it's a buck converter if that makes any difference, but it does seem like that would allow the full power load to pass through the Duex and potentially fry the rail. Ordering the recommended MG995, from the servo wiki, to test against at least for now.

                                    It could be fine, it could be destructive - without word from the manufacturer you just don't know.

                                    Since it seems you have no test equipment even the lack of destruction would not insure it was actually working - it might just shutdown if wired incorrectly.

                                    I went ahead and ordered one. I should be able to determine if the output is isolated. If so you would need to connect the grounds together. I will let you know what I find.

                                    Frederick

                                    Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                                    JRCLundefined 1 Reply Last reply Reply Quote 1
                                    • JRCLundefined
                                      JRCL @fcwilt
                                      last edited by

                                      @fcwilt You're too kind, appreciate the above and beyond support on this

                                      fcwiltundefined 1 Reply Last reply Reply Quote 0
                                      • fcwiltundefined
                                        fcwilt @JRCL
                                        last edited by

                                        @jrcl said in Servo Configuration Check:

                                        @fcwilt You're too kind, appreciate the above and beyond support on this

                                        Glad to be of help when I can.

                                        Frederick

                                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                                        1 Reply Last reply Reply Quote 0
                                        • alankilianundefined
                                          alankilian @fcwilt
                                          last edited by

                                          @fcwilt said in Servo Configuration Check:

                                          @alankilian said in Servo Configuration Check:

                                          @jrcl

                                          I can't tell if that's isolated or not.

                                          If you've got everything else figured out, try connecting the two grounds together at the converter.

                                          Without knowing how the unit is designed that might be unwise.

                                          @JRCL
                                          It's perfectly safe to connect the grounds together on an isolated-output converter.
                                          It just makes it into a nonisolated converter.

                                          Ref: (A poor reference, but nonetheless) https://electronics.stackexchange.com/questions/35800/should-i-isolate-grounds-of-an-isolated-dc-dc-converter

                                          https://electronics.stackexchange.com/questions/181088/connecting-grounds-when-using-an-isolated-dc-dc-converter

                                          SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300

                                          JRCLundefined 1 Reply Last reply Reply Quote 0
                                          • JRCLundefined
                                            JRCL @alankilian
                                            last edited by

                                            @alankilian ohhhh I see I thought you meant to use the onboard ground but positive off the converter. I will give this a try then. Redoing all the wiring on the servo too to be safe too

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