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    Hotend temperature fluctuations

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    Tuning and tweaking
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    • NitroFreakundefined
      NitroFreak
      last edited by

      Hi,
      I wanted to know how to get rid of these temperature fluctuations?

      0_1566925420473_Untitled.png
      They are +1-0.5 degrees for the red one and +2.5-1 °C for the green one.
      The red one is my main with a PT100 tuned for 420C and the blue one a thermistor tuned for 300C.

      I read somewhere that when autotune does not get rid of these fluctuations, you have to increase the dead time by 30%. However i haven´t noticed a change.

      Any idea?

      Max

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      • Urbanundefined
        Urban
        last edited by

        Maybe you could try the PID settings instead, these should be listed when you autotune. To me it looks like the P part is to high, so try cutting it to half. I would also tune at the temperature that you intend to keep, so 300 in this case.

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        • NitroFreakundefined
          NitroFreak @Urban
          last edited by

          @urban said in Hotend temperature fluctuations:

          Maybe you could try the PID settings instead, these should be listed when you autotune. To me it looks like the P part is to high, so try cutting it to half. I would also tune at the temperature that you intend to keep, so 300 in this case.

          I know it would be better, but i print with PPSU at 395°C regularly.
          What do you mean by PID? how do you change the ADC values from the autotune to PID?

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          • Urbanundefined
            Urban
            last edited by

            The M301 command. When you do the autotune the PID parameters are printed at the end of the tuning.

            Hmm.. I also remember that I forgot to insert the ADC values in the config.g once and they disappeared somehow. Maybe that happened to you as well?

            PID is the way you normally control a temperature. This is a good site to explain it:
            http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/

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