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    Bed Auto heating after changing to 24v power supply

    Tuning and tweaking
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    • interwebsdesigner
      interwebsdesigner last edited by

      I am building a Dbot for reference.

      I just changed out my power supply to a 24v supply. I am still in the middle of the build and just got the firmware configured. After turning the bed on once, it seems that the bed just auto heats every time I turn the power on. The SSR gets hot and the LED does not light up until I give a temp through DWC. If I leave it on, it overheats and just keeps going.

      I have looked at the auto tuning documentation but I can't get the printer to stay room temp long enough to run the auto tune.

      Not sure what I am doing wrong here. Any thoughts?
      Does the bed have to be wired differently for 24v and 12v? (I am just looking at the back of the bed and it looks like 2 = Pos / 3 = Ground for 24v - does this matter?)

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      • dc42
        dc42 administrators last edited by

        What model of SSR do you have? Perhaps you have the + and - output terminals of the SSR wired the wrong way round?

        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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        • interwebsdesigner
          interwebsdesigner last edited by

          SSR-25DD

          SSR (1) -> Bed +
          SSR (2) -> V +
          SSR (3) -> DW Bed VIN
          SSR (4) -> DW Bed GND

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          • dc42
            dc42 administrators last edited by

            SSR25DD is basically no good because of its high voltage drop. It has probably overheated and failed. See the very end of https://duet3d.com/wiki/Connecting_a_bed_heater#Low_voltage_.2812V_or_24V.29_DC_bed_heater for recommendations.

            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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            • interwebsdesigner
              interwebsdesigner last edited by

              I did come across that last night and I ordered one of the SSRs you suggested. I think it will be a few days. Thanks for the quick responses.

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