Warning with PID tuning

  • Greetings
    I a new to the Duet world having come from the Replicape world.
    I have a Prusa I3 that I want to us with a Flex3Drive.

    So I am running the PID autotune and I get this error. Everything works but I just want to check if this is really a problem.

    Warning: Heater 1 appears to be over-powered and a fire risk! If left on at full power, its temperature is predicted to reach 714C.
    Auto tune heater 1 completed in 118 sec
    Use M307 H1 to see the result, or M500 to save the result in config-override.g

    Here are the results of M307

    M307 H1
    Heater 1 model: gain 672.7, time constant 75.5, dead time 9.5, max PWM 1.00, mode: PID
    Computed PID parameters for setpoint change: P2.1, I0.028, D14.0
    Computed PID parameters for load change: P2.1, I0.116, D14.0

    Thanks and I'll be here all week!

  • What is your heater resistance and your power supply voltage?

  • administrators

    I'm guessing that you are using an E3D or similar hot end with a 40W heater and a silicone sock. The silicone socks increase the heater gain substantially, hence the "fire risk" warning. It's not uncommon to see this. If it worries you, change to a 25W heater cartridge.

  • Yes to all! Thanks. And after tuning it is not an issue. Thanks

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