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RMaxV2 retrofit question

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Duet Hardware and wiring
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  • undefined
    SEBRET
    last edited by 8 Mar 2019, 07:45

    Just got my Duet Wifi and had a quick wiring question. I'm going to build a new printer, but i want to install the duet in my RMaxV2 and use it to print those parts. right now I have the yellow jacket board on my hotend and it pulls in a single positive 12v and sends back a ground wire for heater, fan, led etc. Can I run these to the duet as i did my rambo, allowing all the power to draw from the heater positive and running the grounds to their respective pins on the duet?

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    • undefined
      aidar
      last edited by aidar 3 Aug 2019, 08:16 8 Mar 2019, 08:15

      My understanding is that you can, as long as you not exceed max rated power for hotend heater channel, that is 5 amps.

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      • undefined
        SEBRET
        last edited by 13 Mar 2019, 03:38

        OK, so a few days later i can say it definitely worked. Now im curious about exploring this further. I don't want to start another thread so ill just dump any new ideas into this one.

        Since all the devices are apparently switched on the low side, I'm considering two more options.

        Option 1 - connect both Vin terminals from the two hot end wires into one line, giving me a 10 amp rated +12v to the hot end. from this I would then simply run a ground wire back for each device. Does anyone know if there would be any load issues from running the two Vin lines as one bus line? I would be running back grounds for a single heater, cooling fan, part fan, and LED ring. obviously if i had a dual extrusion machine i would ground the second heater to its appropriate port, assuming i could still keep the single positive line?

        Option 2 - skip the middle man and bring in a +12v line directly from the power supply. I would still send back grounds to their appropriate connectors on the duet. I guess i would need to fuse the positive line? Or would i still have protection from the onboard fuses?

        The main goal of this is to reduce and simplify wiring to the effector, as the yellowjacket board on the hotend was designed to take all its Vin from the Rambo heater port positive, and switch all the devices to ground at the board. Since it apears i can do the same here I want to run 3 large wires (positive, Heater 1, Heater 2) and up to seven small wires (fans, leds, thermistor) In the form of two separate multi core coiled cables so they stay tidy and self retract.

        i guess I'm just hoping someone will jump in and tell me no before i do something stupid.

        I appreciate any advice you guys have.

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        • undefined
          dc42 administrators
          last edited by dc42 13 Mar 2019, 20:18

          1. Yes you can do that. The recommended maximum current per terminal from the extruder heater output terminal blocks is 6A, but it's probably OK to go a little higher.

          2. Yes, you ought to fuse a positive wire run directly from the PSU to the hot end, because the onboard fuse would not be in the circuit.

          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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          • undefined
            SEBRET
            last edited by 14 Mar 2019, 00:55

            Thank you. Would a 10 amp in line fuse be acceptable? if any of the components like the heater failed closed or shorted, would the fuse pop before the full current damaged any of the ground ports? I know you said the heater ports can only take around 6, and I assume the others less.

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            • undefined
              dc42 administrators
              last edited by 16 Mar 2019, 15:53

              Unless your hot end heaters are unusually powerful, I suggest a 7.5A fuse rather than 10A. It certainly won't protect the fan mosfets if you get a shorted fan, but it might protect the heater mosfets.

              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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