Tuning / gcode for expected very slow heating
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I am using my Duet 3 and some 3D cartridge heaters to heat up a steel mould.
When I run an M303 command, it fails with the message "Auto tune cancelled because temperature not increasing". What can I do, as a work around to this, so that I can heat the mould up slowly.
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@mortarart If the heater is too slow for PID tuning, then the simplest solution would be to use bank-bang control instead. So M307 Hn B1.
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@deckingman I'm getting this error with bang bang. I think I am after a way to manually set the expected heater fault time.
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@mortarart thats available with M570 https://docs.duet3d.com/en/User_manual/Reference/Gcodes#m570-configure-heater-fault-detection
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@jay_s_uk thank you! My Google fu failed me this time.
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I'm still getting errors that heaters are increasing in heat too slowly. They are increasing, but the mass of steel they're warming is quite large, so there's a lot of lag. This occurs even if the temperature is within the M570 T value, which sets the permissible temperature excursion. For instance, if the heater is at 55c, and I set it to 65c, it faults 30 seconds later.
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@mortarart Add or increase the "S" parameter in your M570. Use with caution but if a genuine fault is unlikely to be a fire hazard, then try something like 600 (10 minutes) or even higher
