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    M301 PID or M307 ACD?

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    Tuning and tweaking
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    • handyandyundefined
      handyandy
      last edited by

      Having just completed my PID tuning on my bed and hot end I get two sets of figures for each...

      10‎:‎09‎:‎12
      M307 H0
      Heater 0 model: gain 485.1, time constant 532.3, dead time 1.0, max PWM 1.00, calibration voltage 24.2, mode PID, inverted no, frequency default
      Computed PID parameters for setpoint change: P198.7, I8.675, D137.1
      Computed PID parameters for load change: P1
      ‎10‎:‎09‎:‎00

      M307 H1
      Heater 1 model: gain 599.1, time constant 279.4, dead time 4.7, max PWM 1.00, calibration voltage 24.1, mode PID, inverted no, frequency default
      Computed PID parameters for setpoint change: P17.7, I0.486, D58.3
      Computed PID parameters for load change: P17.

      My question is which figures should I use in my config.g file - M301 and PID or M307 and ACD (gain, time constant and deadtime)?

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      • dc42undefined
        dc42 administrators
        last edited by

        Just use M307. The computed PID parameters are displayed for information only, and will be applied automatically.

        btw the reported dead time of 1.0 for the bed heater is rather low. But that may just mean that you are using a silicone heater with a built-in thermistor. If the bed temperature oscillates around the set point, try increasing that D parameter. You can do that live while the bed heater is hot.

        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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