M500

[richardmckenna]

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?

[blt3dp]

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.

[richardmckenna]

@blt3dp great thank you.

Yeah makes sense about the 24V + SSR.

[dc42]

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.

[richardmckenna]

@dc42 cool thanks for the clarification.