Bed heating problem
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This post is directed mainly at David, however I'm happy for anyone who has had a similar problem to chip in.
Upon the warranty return of my Duet Wifi board I decided to take it slowly and one step at a time:
Got the Wi-Fi connected - no problem
Connected the hot end wiring and thermistor
Connected the bed heater wiring and thermistorDecided to test things so far - hot end went up to 180c without problem and levelled off nicely.
Problem is with the bed heater, it will not go above 35c before switching off and returning a fault of "Taking excessively long to heat up, check wiring" ( I paraphrase)
I have checked all wiring and connections and cannot see any problems. It takes only a few seconds to go from an ambient of 20.5c to 35.4c (seems a reasonable time to me).
Any thoughts?
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@brian_k What is the actual message - not the paraphrased version?
Edit. Does this happen when you run heater tuning and/or have you run heater tuning?
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Hi,
The exact message is:
“ERROR: Heater fault on heater 0, temperature rising much more slowly than expected
1.3c sec”No I haven’t tried any heater tuning.
Thanks
Edit: Sorry forgot to mention, the hot end fan is also connected but directly through the power supply block.
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can you tell us more about the bed?
size. voltage. resistance -
@brian_k Try tuning it. It'll either fix the problem or throw more light on the reason for it happening. Also check that the values you have in M305 for P0 match that actual thermistor that you are using on the bed.
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As @deckingman says. The heater protection in RepRapFirmware is tuned to detect differences from the normal behaviour of the heaters in your printer. So it needs to know what the normal behaviour is, unless that behaviour is close the the default heater model
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OK, how do I go about tuning it?
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@brian_k said in Bed heating problem:
OK, how do I go about tuning it?
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control
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Excellent, many thanks.
