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    Servo Configuration Check

    Scheduled Pinned Locked Moved
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    • JRCLundefined
      JRCL @Phaedrux
      last edited by

      @phaedrux Yes! I think that’s just about all I have seen actually 😄

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

        @jrcl

        Try one of the Duex5 pins that have pwm in the name. Not all output pins can generate PWM signals.

        !duex.pwm1
        !duex.pwm2
        !duex.pwm3
        !duex.pwm4
        !duex.pwm5

        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
        • JoergS5undefined
          JoergS5 @JRCL
          last edited by JoergS5

          @jrcl said in Servo Configuration Check:

          a M280 S0 P90 command

          hello, the command is P0 for servo index, not S.
          M280 P0 S90
          (an example of mutliple traps where the letter changes for the same thing)

          JRCLundefined 1 Reply Last reply Reply Quote 1
          • JRCLundefined
            JRCL @JoergS5
            last edited by

            @joergs5 Whoops! A mistype on my part in the post the correct command still does nothing. It's been since edited.

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            • JRCLundefined
              JRCL @fcwilt
              last edited by

              @fcwilt Gave this a try to no avail. Realized that my BL Touch was assigned to S0 so changed to

              M950 S1 C"!duex.pwm2"

              and after sending a M280 P1 S90, still got no response.

              alankilianundefined 1 Reply Last reply Reply Quote 0
              • 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
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