PID Values gone wacky?
I recently had to change my printer's thermistor, after which you are supposed to update the printer's PID values because, apparently, different thermistors behave somewhat differently. Well, I did not do that, and then I noticed my hotend temperatures were deviating quite a lot from the specified value. "Quite a lot" means up to 20 degrees.
Well needless to say this caused all sorts of extrusion problems, so I figured I better do the PID reset. I followed the steps on the Atom2 website and ended up with these values: Kp = 30.90, Ki = 2.79, and Kd = 93.32.
I used the LCD panel to enter these values and then did a Store Memory/Load Memory. So I think I got the new values saved OK. I did notice that the new values were quite a bit different from the ones previously in the firmware.
Now my printer is printing and doing a great job with extrusion. But the LCD says the temperature is 166/200. This can't be true because at 166 my PLA filament would be completely solid. But the extruder is working fine and the layers look great.
In the time I have typed this the LCD has changed to 177/200. So I must have messed something up - but what?
PS: Now the LCD says 167/200 - but printing looks A-OK.
Edit: After about 12 minutes the hotend jammed and the extruder was not able to feed filament. So my guess is there is something messed up with the temperature control.
Edit 2: I hooked the printer up to Simplify3D's Machine Control Panel and watched the temperature plot as I tried different values for the hotend temperature. All of the plots looked good - I changed temps from hotter to colder and back again and the indicated temp always hit the specified value right on - and held it. Moreover, the LCD display also indicated the correct temperature and was in agreement with the temperature plot.
So I started my actual print again and (again) it seems to be going ok. But the LCD says 167/200 right now.
Most confusing indeed.
翻譯年糕
Clarence Lee
2016-01-15 08:57:19
Is side fan blowing when it's 16x/200 ?
Is bottom wind shielding available?
Where did you get the thermistor?
Is it NTC 100K?
B 3950?
Or even have a model number like MF58
