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    Power Supply wiring question

    Duet Hardware and wiring
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    • airscapes
      airscapes last edited by

      I am replacing a working Rambo Board in a MakerGear M2 and the power supply has 3 sets of 24v outputs. Looks like the Duet 2 only has one VIN, anyone know if I can safely team all 3 output into one?
      alt text

      fcwilt alankilian 2 Replies Last reply Reply Quote 0
      • fcwilt
        fcwilt @airscapes last edited by

        @airscapes

        Yes - just double, no triple check your work before applying power. It's really hard to get the "magic smoke" back in.

        Frederick

        Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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

          @fcwilt said in Power Supply wiring question:

          @airscapes

          Yes - just double, no triple check your work before applying power. It's really hard to get the "magic smoke" back in.

          Frederick

          As an auto mechanic from a former career, I learned that lesson early on.. 🙂

          1 Reply Last reply Reply Quote 1
          • alankilian
            alankilian @airscapes last edited by

            @airscapes said in Power Supply wiring question:

            team all 3 output into one?

            I think those three outputs are connected together at the power supply anyway, so you can just run one wire from any of the three terminals to the Duet board.

            You can verify this by turning the power supply off and using a meter set on Ohms to check between the three terminals to see if they are near zero Ohms when nothing is connected to them.

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

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

              @alankilian Yes, another guy in the MG forum suggested that and they are all coming from a common location so I am good to do with one 14g pair.

              achrn 1 Reply Last reply Reply Quote 0
              • achrn
                achrn @airscapes last edited by

                @airscapes said in Power Supply wiring question:

                so I am good to do with one 14g pair.

                As long as the connectors are up to spec - I have sometimes assumed that power supplies have this arrangement (and a lot of them certainly do) because the connections are not rated to the full current the supply is capable of. (Though it might sometimes be simply because the power is needed in different places - e.g. multiple disk drives in a PC.)

                The Duet end is will be OK, I can't make out (from the photo) what the PSU end is.

                airscapes 1 Reply Last reply Reply Quote 0
                • airscapes
                  airscapes @achrn last edited by

                  @achrn said in Power Supply wiring question:

                  @airscapes said in Power Supply wiring question:

                  so I am good to do with one 14g pair.

                  As long as the connectors are up to spec - I have sometimes assumed that power supplies have this arrangement (and a lot of them certainly do) because the connections are not rated to the full current the supply is capable of. (Though it might sometimes be simply because the power is needed in different places - e.g. multiple disk drives in a PC.)

                  The Duet end is will be OK, I can't make out (from the photo) what the PSU end is.

                  On the rambo they connect to 3 seperate thing.. hotend, bed and logic. all positive and negative connection on the PS are the same. No resistance when checking between all positive and all negative terminals. I will probably just remove the all the wires from the PS and run a single 14 awg wire pair from all 3 connection at the PS to the Duet.

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

                    @airscapes

                    What gauge are the existing wires? Together they may already surpass 14 gauge.

                    Certainly nothing wrong with replacing them

                    Frederick

                    Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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

                      @fcwilt Have not measured them. The PS is rated at 18.5 amps ane the wires look to be 18 at best but probably 16 since no one of the 3 things powered is going to pull 15 amps by itself.
                      According to this calc using 24v 3ft and 15amps I can use wither 16 or 14 gauge. Since I have 16 gauge J cord I will probably just go with that.
                      https://www.wirebarn.com/Wire-Calculator-_ep_41.html

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

                        @airscapes said in Power Supply wiring question:

                        @fcwilt Have not measured them. The PS is rated at 18.5 amps ane the wires look to be 18 at best but probably 16 since no one of the 3 things powered is going to pull 15 amps by itself.
                        According to this calc using 24v 3ft and 15amps I can use wither 16 or 14 gauge. Since I have 16 gauge J cord I will probably just go with that.
                        https://www.wirebarn.com/Wire-Calculator-_ep_41.html

                        One 14 has a cross section of appx 2.0 sq mm.

                        Two 16 would be appx 2.6.

                        Three 18 would be appx 2.4.

                        Frederick

                        Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

                        1 Reply Last reply Reply Quote 0
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