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    Duet3 expansion - power supply

    Duet Hardware and wiring
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    • barbarossa.cologne
      barbarossa.cologne last edited by

      hey communitiy,
      Do I have to connect the expansion board power via the mainboard or should I connect it directly to the RSU?
      maybe a stupid question.....but I´m scared todestroy the electronic.
      KR Richard Gruna
      tahnks

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      • Phaedrux
        Phaedrux Moderator last edited by

        Do you mean daisy chaining the power from the main board to the expansion? Connecting directly to the power supply would probably be best. I don't think it has the same shared ground connection that the Duet2 and Duex board has.

        barbarossa.cologne 1 Reply Last reply Reply Quote 0
        • dc42
          dc42 administrators last edited by

          You can connect the expansion board directly to the PSU, or daisy chain the power from one board to another. There is just one combination that I have found not to work well:

          • High powered bed heater driven directly from the Duet 3 bed heater output
          • Long and not very thick wires between the PSU and the Duet 3 main board
          • Expansion board powered directly from the PSU

          This combination generates enough differential ground noise to upset the CAN bus signals. So if using the Duet 3 to drive a high-powered heater directly, position the PSU close to the Duet 3 and use short thick power wires between them.

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          • barbarossa.cologne
            barbarossa.cologne @Phaedrux last edited by

            @Phaedrux
            I use Duet3 6hc with the duet3 expansion 3hc...
            I´ll try to connect both boards directly to the RSU.

            @dc42 To avoid this problems I´ll use a SSR to heat the bed. In this case its not direct driven by the Duet3, rigth?

            Phaedrux 1 Reply Last reply Reply Quote 0
            • Phaedrux
              Phaedrux Moderator @barbarossa.cologne last edited by

              @barbarossa-cologne said in Duet3 expansion - power supply:

              In this case its not direct driven by the Duet3, rigth?

              Correct.

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