M500



  • With M500 not implemented yet on Duet3+Pi and writing empty values to config-overide.g

    M307 H0 A C D S V B0
    

    This is what I get from M307 H1 after autotune.

    Heater 0 model: gain 434.1, time constant 469.9, dead time 4.0, max PWM 1.00, calibration voltage 24.0, mode PID
    Computed PID parameters for setpoint change: P48.5, I1.120, D135.2
    Computed PID parameters for load change: P48.5, I3.237, D135.2
    

    Does this look right?

    M307 H0 A434.1 C469.9 D4.0 S1.00 V? B0
    

    It's a 220V heater, should I set V to 220? or just leave it off?



  • Looks right to me, I have a similar setup and left the V parameter off. I suppose if you include it, it would be set to 24v cause that’s all the Duet is aware of because that’s what it’s using to drive the SSR.



  • @blt3dp great thank you.

    Yeah makes sense about the 24V + SSR.


  • administrators

    Leave the V parameter off (or use V0) when using a mains-voltage SSR. Otherwise the firmware will try to adjust the heating power compensate for changes in the VIN voltage, which doesn't make sense when using a mains-voltage heater.



  • @dc42 cool thanks for the clarification.


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