PID Autotune Failed timeout

[taav]

Hey trying to run my PID command M303 P1 S60

It brings the temperature up to around 54C then i get this message PID autotune failed timeout.

not sure whats causing it, the board seems to heat up just fine though, not sure whats causing it to stop.

Is it a power issue?

[geolupulus]

Is it a Rev 3 onyx?

[taav]

Hey HI

UPDATE

The wiring was a little off i fixed it everything works fine now.

Ran the PiD weirdly though i got 2 PID values, not sure whats going on here.

Also after the PID routine the arm giggled a little, it was a bit odd, thought i should report these minor hicups anyway.

By the way these are my PID values which ones should i use, i got two sets.

11:14:54.253 : bias: 153 d: 101 min: 59.95 max: 60.04
11:15:19.650 : bias: 64 d: 64 min: 59.95 max: 60.12
11:15:25.718 : bias: 64 d: 64 min: 59.95 max: 60.04
11:15:25.718 : Ku: 946.66 Tu: 6.07
11:15:25.718 : Classic PID
11:15:25.718 : Kp: 568.00
11:15:25.718 : Ki: 187.30
11:15:25.718 : Kd: 430.61
11:15:38.853 : bias: 92 d: 92 min: 59.91 max: 60.04
11:15:38.853 : Ku: 879.08 Tu: 13.14
11:15:38.853 : Classic PID
11:15:38.853 : Kp: 527.45
11:15:38.853 : Ki: 80.29
11:15:38.853 : Kd: 866.20

[zerakren]

Hey HI

UPDATE

The wiring was a little off i fixed it everything works fine now.

Ran the PiD weirdly though i got 2 PID values, not sure whats going on here.

Also after the PID routine the arm giggled a little, it was a bit odd, thought i should report these minor hicups anyway.

By the way these are my PID values which ones should i use, i got two sets.

11:14:54.253 : bias: 153 d: 101 min: 59.95 max: 60.04
11:15:19.650 : bias: 64 d: 64 min: 59.95 max: 60.12
11:15:25.718 : bias: 64 d: 64 min: 59.95 max: 60.04
11:15:25.718 : Ku: 946.66 Tu: 6.07
11:15:25.718 : Classic PID
11:15:25.718 : Kp: 568.00
11:15:25.718 : Ki: 187.30
11:15:25.718 : Kd: 430.61
11:15:38.853 : bias: 92 d: 92 min: 59.91 max: 60.04
11:15:38.853 : Ku: 879.08 Tu: 13.14
11:15:38.853 : Classic PID
11:15:38.853 : Kp: 527.45
11:15:38.853 : Ki: 80.29
11:15:38.853 : Kd: 866.20

What was the issue with the wiring? Im also have this issue now on onyx rev 3 and i cant hit 100c

[redoverred]

You should just use dead time control, it's easier, faster to tune, and just as good as PID. I honestly don't even know why the Rostock manual even recommends PID tuning any longer. Dead time is incredibly easy! Heck, with most hotends you can use 2-3 seconds for the dead time number and you're good to go. This could be baked into the firmware with no user intervention!

[JFettig]

I recently manually tuned my extruder and bed, the numbers that came from auto tuning were sooooo far off I couldn't believe it - but they did get me started. The P values were fine but the D and I values are significantly different. Bed had over 1000 for D, now its around 25, and for the extruder they had D at 58 and now its at .3 I is close but it was also too high.

D is what causes rapid fluctuations in extruder power(see in repetier host or server), I is usually what causes the rolling swings - unless its also too high then it will oscillate violently.

P values were fine, I could probably dial those in too but the bed is large and it won't overshoot too much with the auto-tuned P value, the extruder could, mine only overshoots a couple degrees.

[JFettig]

taav, the power supplies in these machines are pretty weak, one thin you can do for the bed ONLY is raise the temp up manually by setting it about 10-20c lower than your target temp, then do the PID auto tune, the values you got are rather high and might not be very stable. I last tuned mine at only 60C as getting up over 80 will cause it to time out.

[zerakren]

I also just tuned my bed for 'more accurate heating' I dont remember ever having issues ever heating it to 100c but now it crawls to a stop at 93c. when i did the PID auto tune the values were way off but I foolishly didnt write them down. now my bed takes forever to heat and its very annoying. thinking about going back to default which will really suck.