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Problem using temperature over 220C

glompos21

Problem using temperature over 220C
March 05, 2016 08:31AM

Registered: 8 years ago
Posts: 7

I have using the default configuration of the PID for the hot end
M301 H1 P12 I0.4 D80 W180 B300
When i set the temperature to be 200-220C it goes excellent. When i set the temperature over 230C, it overshoot
and after 4-6 min goes to 300C.
I have done some testing reducing by a factor of 2 the P and increase the value of D but the results are the same .
Have anyone using different values for the PID?

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dc42

Re: Problem using temperature over 220C
March 05, 2016 02:17PM

Registered: 10 years ago
Posts: 14,672

I don't have a Fisher, but I did some research on PID in RepRapFirmware over a year ago, and I introduced additional terms to get more accurate temperature control over a wider range of temperatures. I suggest you try reducing B to 30 and I to 0.1. If that results in stable temperature control, then there are fine adjustments that can be made to deal with any residual undershoot or overshoot.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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glompos21

Re: Problem using temperature over 220C
March 20, 2016 12:53PM

Registered: 8 years ago
Posts: 7

After many hours my experiments find the following configuration:
M301 H1 P12 I0.2 D10 W180 B30