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    • Jaysonundefined

      safety relay for ssr heated bed.

      Duet Hardware and wiring
      • solid state relay ssr safety thermal runaway • • Jayson
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      zaptaundefined

      @mrehorstdmd said in safety relay for ssr heated bed.:

      How are you going to protect the protection relay from some crud preventing its armature from moving, or from the contacts welding shut?

      My relay is noisy so I hear it clicking on each time I turn the printer on. Kind of a self test.

      "perfect is the enemy of good" . 😉

      It not a perfect solution but it reduces the risk of fire due to a short in the duet's mosfet or the SSR.

    • HamiltonPropsundefined

      Huge temperature fluctuations when starting a print?

      Duet Hardware and wiring
      • duetwifi duet3d wifi connectivity heaters thermistor heat fault fault wifi thermal runaway tuning • • HamiltonProps
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      deckingmanundefined

      @hamiltonprops From re- reading your OP, you say that the temperature drops 20 degrees within a second or two. That would indicate it's not a "real" drop in temperature but rather a drop in the indicated (measured) temperature - unless your hot end has an insanely low thermal mass. So, yes I go for some sort of cross talk or electrical "noise". Are you sure you haven't got a bad crimp on the thermistor wiring somewhere?

    • TheBigKentundefined

      Can't stop my heated bed and extruder

      Duet Hardware and wiring
      • thermal runaway • • TheBigKent
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      TheBigKentundefined

      @dc42 Okay, will do.