V3.3 FW on Duet Wifi - Bed not heating fast enough error message
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Decided to drop a Duet Wifi board into a Sidewinder X1 today and after updating the FW to 3.3 I'm getting an odd message after setting the bed to 60C saying "Error: Heater 0 fault: temperature rising much more slowly than the expected 1.2°C/sec" 1.2C/sec is actually quite fast for a 310x310 bed. I did try the auto tuning process on the bed however I just seemed to stay in a heat/cool loop for 2 hours so canned it. It's currently set to use bang-bang so the SSR is delivering the full 240V AC to the heater with no backing off till it gets to 60C. Is there some way to bypass this error check or at least tweak it to expect at least 0.5C/sec or something smaller?
Super irritating having to reset the fault and brute force it to try again and again till I get 60C.
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@jgrouse you need to run the PID (which can take ages, just wait it out) or manually change the PID details
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@jay_s_uk - was hoping to avoid that. Ok, it's running now. Will post back in a few days when it's done. There really has to be an easier way. Anyone got some PID setting examples from their 300x300mm 240V AC heated bed?
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@jgrouse if the temperature readings have little noise then you can speed up the tuning process by using the Y parameter to reduce the hysteresis. The default value is 5C.
If you want to bypass tuning for now, you can construct a M307 command manually. It sounds to me that your bed heater is using default M307 values for a hot end heater. The default values for a bed heater are:
M307 H0 R0.13 C700 D10
You may find that those values work well enough.
