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    Shared positiv line for heaters

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    • taconiteundefined
      taconite
      last edited by taconite

      Hello Guys,

      I am trying to build a 5 Hot-End setup with Bowden-Extruders. To reduce wiring I would like to run only 1 positive Line for all Heater Cartidges and then split them up into the individuals. The shared wire will have a bigger diameter to handle the current. Is this possible (like shared positive for fans) or is there something special about the heater pwm ports?

      Furthermore does it make sense to get the positive line right from the power supply?

      Untitled Diagram(1).png
      Best Regards

      Edit: Wrong naming in picture

      Custom ANET A8
      Custom Delta: D-PATCH (Delta Printer with Automatic Tool CHanging) https://forum.duet3d.com/topic/16082/d-patch?_=1596131234754

      All I do here is under this license: CC BY-NC-SA

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      • A Former User?
        A Former User
        last edited by A Former User

        Common positive will work fine with the Duets low side switching.
        (You don't need to run the common positive back to the heater terminal, if using more than power supply you will need common ground between the supplies)

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        • DocTruckerundefined
          DocTrucker
          last edited by DocTrucker

          Drop a fuse inline for your own piece of mind incase of a dead short. Better still would be a suitably rated relay after the fuse to kill the common controlled by the PS_ON (M80/M81) output of the board.

          Edit: I agree with @bearer, take the common back to a spare input on your power supply would be easiest. No need to do anything with the posative terminals of the heater terminals on the duet, leave them unpopulated. In a standard setup the duet is merely providing a fused common feed to all the heater connections anyway. Fairly certain there is nothing more than the fuse between VIN and the posative heater terminals.

          Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!

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          • dc42undefined
            dc42 administrators @DocTrucker
            last edited by

            @DocTrucker said in Shared positiv line for heaters:

            Fairly certain there is nothing more than the fuse between VIN and the posative heater terminals

            Correct.

            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

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