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    PWM to Voltage Converter Issues - Again!

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    • Nightowlundefined
      Nightowl @gloomyandy
      last edited by

      @gloomyandy

      Tested the converter and it is defective. I cannot get more than 8.4V out from the spindle control pins when I actually need 10V, so a new one is on order!

      Thanks for pointing me in the right direction in getting this sorted.

      Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
      I'm still on my learning curve, so take everything I say with caution!

      RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

      1 Reply Last reply Reply Quote 1
      • Nightowlundefined
        Nightowl @gloomyandy
        last edited by

        @gloomyandy

        I've ordered two of these, from different manufacturers (at least as far as the trading name goes) but both of the new ones have an output of between 0 and 8.6VDC, and turning the small screw has absolutely no effect at all.

        The input voltage is 12VDC (measured) and the PWM voltage is 5VDC (measured) to get an output of 8.4VDC, or a PWM voltage of 0VDC to get an output of 0.0VDC

        So now I'm clean out of ideas.

        Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
        I'm still on my learning curve, so take everything I say with caution!

        RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

        dc42undefined T3P3Tonyundefined 2 Replies Last reply Reply Quote 0
        • dc42undefined
          dc42 administrators @Nightowl
          last edited by

          @Nightowl can you trace the schematic of them?

          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

          Nightowlundefined 1 Reply Last reply Reply Quote 0
          • Nightowlundefined
            Nightowl @dc42
            last edited by Nightowl

            @dc42
            Not very well, I'm afraid. What would I need to know?

            I could provide a photo 🙄

            Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
            I'm still on my learning curve, so take everything I say with caution!

            RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

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

              @Nightowl I have one somewhere, but it may take me a while to find it.

              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

              Nightowlundefined 1 Reply Last reply Reply Quote 0
              • Nightowlundefined
                Nightowl @dc42
                last edited by

                @dc42 Isn't it in the cupboard, behind the clock?

                That's where I keep finding 'lost' stuff 😁 😁

                Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
                I'm still on my learning curve, so take everything I say with caution!

                RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

                1 Reply Last reply Reply Quote 0
                • T3P3Tonyundefined
                  T3P3Tony administrators @Nightowl
                  last edited by

                  @Nightowl said in PWM to Voltage Converter Issues - Again!:

                  've ordered two of these, from different manufacturers (at least as far as the trading name goes) but both of the new ones have an output of between 0 and 8.6VDC, and turning the small screw has absolutely no effect at all.

                  I would return them as faulty as a start!

                  www.duet3d.com

                  Nightowlundefined 1 Reply Last reply Reply Quote 0
                  • Nightowlundefined
                    Nightowl @T3P3Tony
                    last edited by Nightowl

                    @T3P3Tony

                    Yup, they're gone!

                    Further to this, though... The one that does come close still only provides 9.6VDC, and that's with the brass screw all the way in, but I had to use 24V directly from the PSU, not 12V/GND supply adjacent to the VFD/Laser/Servo Driver header.

                    I really don't understand why the converter won't give the 10V the spindle needs.

                    Perhaps it's time to persuade Duet to design it into the control board 🙄 🙄

                    Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
                    I'm still on my learning curve, so take everything I say with caution!

                    RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

                    1 Reply Last reply Reply Quote 1
                    • Nightowlundefined
                      Nightowl
                      last edited by

                      So, I've been out to the workshed (too small to be a workshop, too big to be a toolshed) and, with the (cheapest) PWM-Voltage converter managed to achieve the following:

                      Programmed - Actual Speeds
                      M10000 gives 10,150rpm
                      M14000 gives 14,010rpm
                      M18000 gives 18,000rpm
                      

                      As this is the speed range within which I primarily use the spindle, I think that'll do!

                      Thanks to you all for your help!

                      Few things are more dangerous than taking the advice of someone who thinks he knows what he's doing.
                      I'm still on my learning curve, so take everything I say with caution!

                      RatRig 1075, Duet3 MB6HC, Sorotec SFM 1000 PV-ER milling motor, Hobbyist

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

                        @Nightowl EXCELLENT!!!

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

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