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    Servo Configuration Check

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    • 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
                                      • alankilianundefined
                                        alankilian @JRCL
                                        last edited by

                                        @jrcl It's just a lart-ditch effort.

                                        A US$10 converter is almost certainly not isolated, so I don't think this is your problem, but sometimes when you have verified everything else is right, you've got to try something.

                                        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 Agreed! Worth the attempt, but alas it didn't fix the problem.

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

                                            @jrcl said in Servo Configuration Check:

                                            @alankilian Agreed! Worth the attempt, but alas it didn't fix the problem.

                                            It may be the signal from the Duet is not compatible. I can measure the signal and tell you about it. Perhaps you can determine if it is/is not compatible with your servo.

                                            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 1
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