Issues with temperature in Duet 1.4

  • Hi,

    i have finish install new Duet, and i am doing first steps.

    I have try to tunning temperature sensors, but i recive this message in consolole

    10:14:57 Warning: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 655C.
    Auto tune heater 1 completed in 327 sec
    Use M307 H1 to see the result, or M500 to save the result in config-override.g
    10:11:32 Auto tune phase 3, peak temperature was 257.3
    10:11:25 Auto tune phase 2, heater off
    10:09:35 Auto tune phase 1, heater on

    This message is tuning temperature, in Hotend. Similar in bed.

    Macros i use:

    A - Nozzle

    M303 H1 S250

    B - Bed

    M303 H0 S90

  • @peirof That's fairly common if you use a silicone sock on the hot end.

    In that case, or even if not, the message is clear. The heater(s) is/are considered to be over powered for the application.

    Your choices are simple. Either ignore the message (at your own risk) or use lower powered heaters.

  • Mmmm...

    this generates a doubt ...

    how can I know that the temperature reading is reliable?
    Is there any way to know that the thermocouple is working well?
    Is there a thermocouple model that is more accurate?

  • Those sort of values are high, but not unheard-of. What hotend and what power heater cartridge do you have? Correct voltage for your supply? Checked resistance of tje cartridge with it disconnected?

    You can check where it detects boiling point of water, but accuracy at 100C doesn't necessarily relate to accuracy at ~200C. You could see what is the minimum temperature required to extrude ABS if you have some. That'd give a rough idea.

    Best is to ensure the temperature sensor is set up correctly for it's type in the config and if you have concerns swap it for a new one.

  • PT100 sensors are clhenerally regarded as more accurate than the standard thermistors, but can be more susceptible to noise. They are also classed for accuracy.

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