error when slow heating

moth4017

Im heating up a Dry box slowly and i seem to remember there is a way to change the expected degC/sec rate of change to stop this error , but i carnt find it anywhere . please point me to link or soloution

Phaedrux

You can try adjusting your M307 R parameter.

https://docs.duet3d.com/User_manual/Reference/Gcodes#m307-set-or-report-heating-process-parameters

moth4017

@Phaedrux

Dry Box
M308 S3 P"e0temp" Y"thermistor" T100000 B4267 A"Drybox high °C" ;
M950 H3 C"e3heat" T3 ; create chamber heater output on duex.e2heat and map; it to sensor 3
M307 H3 R1.022 K4.802:0.000 D6.58 E1.35 S1.00 B0 ; B= (bang-bang mode = 1 PWM =0) s=max PWM
M141 H3 ; map heater 3
M143 H3 S80 A1 ; set temperature limit for heater

R >or < ?

here is the PWM outputs dry box in purple

moth4017

@Phaedrux what's the Dead time , can i up that "D" parameter to say 200 will the safety features still be active or are they ignored for 200 seconds?

looks like D has to be less than 11 seconds

Dropping the value of R to 0.022 seems to have delayed the time that the error pops up
, how is the R value calculated?

Solved did another PID tune now seems ok