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    M915 Cool-Step strategy

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    • Ethelred
      Ethelred last edited by

      I'm interested in trying to reduce extruder stepper heating by invoking the M915 Tnnn cool-step parameter. The steppers are NEMA14 pancake style with 5.0 mh x 7.0 ohm phase parameters. They operate in a low rpm regime. I have been unable to identify what the "T" value vs. current relationship is. A 16 bit integer "T" range is pretty broad. Any clues?

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      • dc42
        dc42 administrators last edited by

        See section 5 in the TMC2660 datasheet at https://www.trinamic.com/fileadmin/assets/Products/ICs_Documents/TMC2660_datasheet.pdf. The M122 report includes the highest and lowest SG register values since M122 was last run, to help you find the correct coolstep setting.

        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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