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    Hotbed overheating

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • Brmattundefined
      Brmatt
      last edited by

      Having some trouble with the hotbed overheating. After various heater tunings and parameter updates I have had no success. The main issue is when I set the target temperature for the bed it will reach and then exceed that temperature, triggering the fail safe. Here is my current parameters: 0_1547155385639_debf052e-95d9-4b72-8e40-4d06e3c3a231-image.png

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        I presume those M307 values came from tuning the bed. If they are correct, your bed heater is more than twice as powerful as it should be. Are you sure you are not running a 12V heater on a 24V supply?

        If those M307 values are in config.g, check that they are not being overridden by a different set of M307 parameters in config-override.g.

        If you want to continue using that bed heater, for safety reasons you should definitely use a thermal cutout to reduce the risk of fire. You should get less overshoot if you restrict the PWM to about 0.4 in the M307 command.

        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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