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Bed heating error

Posted by jepigepas 
Bed heating error
April 25, 2017 08:37AM
Hi all of you,
My bed heating has a curious behaviour:
When I directly set the bed temperature to the finale value 60°C, after 1° heating over the ambiant temperature, a message appears "Heating error, printer stopped".
And the printer stops actually.

But when I set the temperature by hand to grow by steps of 5°C it do it without problem.
I guess there is a security in the Arduino that I don't know.

Could some of you help me to skip this error ?
Thank you in advance,
Jacques
Re: Bed heating error
April 25, 2017 12:59PM
It seems that either the PID values are a good deal off, or the error margin is to slim.
I would start with trying to find better PID values since the defaults for the error margin in the firmware are usually ok.


[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]
Re: Bed heating error
April 29, 2017 08:15AM
Hi Srek,
Thank you for your response.
I have tried a lot of things, such as choose the configuration

#define DEFAULT_bedKp 97.1
#define DEFAULT_bedKi 1.41
#define DEFAULT_bedKd 1675.16

in place of

//#define DEFAULT_bedKp 10.00
//#define DEFAULT_bedKi .023
//#define DEFAULT_bedKd 305.4

But unfortunately, I know nothing about the PID progamming and so, I don't know what my changes can do.

Nevertheless, I have observed that now, the heating process can work until reaching the temperature 60°C.
But after, if the gap beteewn the consigne and the real temperature is greater than 5°C, the printer fails with an error message "Heating error".

With a temprerature arround 75°C, It has also happened that the printer stops during the print with that message "heating runaway" (emballement de chauffage, in French).

Could you please tell me how I can change the PID to improve my experience ?
Thank you,
Jacques
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