High power heater cartrdige PID settings?
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Hello all,
I'm having a little bit of difficulty getting the best PID settings for my current printer setup.
Setup:
Duet
24V
DyzeEnd Pro with a 60W heater cartridge
PT100
Water cooledI've run Autotune to 450deg C at 0.75PWM and the following figures were presented to me with a warning that the unit can reach 1060 deg C.
GAIN: 1035
Temp Constant: 378.5
Dead Time: 3.6When I bench test these they worked well, I also setup start gcode for my less power hungry filaments which simply sets the PWM to 0.5. All this worked really well.
However when I put these figures into my printers config I keep getting heating up errors telling me the unit is not heating up fast enough.
Now I have deleted the config.overide from both machine as too be honest I don't know why it is there.
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Could it be that somwhere else there is more failsafe PID settings which I'm missing?
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Has anyone else experienced this? If so what can be done to fix it?
Any help would be greatly appreciated.
Cheers,
Andre
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If you're changing the PWM factor after the tuning that could explain it. You could run PID tuning at 75% and at 50% and then load those tuned values as needed.
I've run Autotune to 450deg C at 0.75PWM and the following figures were presented to me with a warning that the unit can reach 1060 deg C.
That 1060c figure is based on 75% power, and in a failure situation you would be getting 100% power, so that 1060c is lower than what you might actually get. 60w will slag your hotend in a failed on state. So definitely have some precautions in place.
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Thank you very much for the reply.
I'll try that.
With regards to the config.override in the systems folder do you know what that is for?
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@C6D see https://duet3d.dozuki.com/Wiki/Gcode#Section_M501_Read_stored_parameters and also M500 to store them. Emulates marlin and repeteirs eeprom function, sort of.
