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    OK to control PTC heaters using PID?

    Duet Hardware and wiring
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    • Marc Lee
      Marc Lee last edited by

      Is it a good idea to control 220V PTC heaters heaters using PID (via an SSR obviously).
      E.g. like these ceramic PTC heaters:
      https://www.aliexpress.com/store/group/220V/508447_257834596.html?spm=2114.8147860.0.0.KQn4nw
      or these:
      https://www.aliexpress.com/store/group/220V/508447_258832837.html

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      • dc42
        dc42 administrators last edited by

        I can't see any reason not to. RRF uses low frequency (10Hz) PID on the bed and chamber heaters so as to be compatible with all types of SSR.

        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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        • Marc Lee
          Marc Lee last edited by

          Thanks dc42. Is anyone else using PTC heaters for the bed and/or enclosure? Becasue the maximum temperature of PTC heaters is inherent in their construction, it seems this makes them safer than other heater options that rely on additional temperature sensors to stop thermal runaway. Is this correct logic?

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          • dc42
            dc42 administrators last edited by

            @Marc:

            Thanks dc42. Is anyone else using PTC heaters for the bed and/or enclosure? Becasue the maximum temperature of PTC heaters is inherent in their construction, it seems this makes them safer than other heater options that rely on additional temperature sensors to stop thermal runaway. Is this correct logic?

            I think that is good logic, provided that the heater can still reach the temperature you need in a reasonable time.

            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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