wack temperatures and odd behavior - rostock max v2

[shabbadooo]

ok guys, new rostock owner and relative 3d printing newcomer so please be gentle

for a couple months in my free time i've been getting to know my rostock max printer and feeling good about the progress from rough to dialed in to a little more dialed in...

last week though i had something odd happen. i used mattercontrol to decrease the temperature on the material setting (ABS, printing benchy, attempt to reduce stringing) to 210C from 228.

when i went to print, instead of waiting for the bed and hot end to heat up it just started in cold, trying to print. after a quick hard shut down and a reboot of the printer and mattercontrol, what happens now is that when i preheat, it doesn't stop at the max temp and keeps on going up, quite quickly. i haven't tried to print anything for fear of replicating the cold print issue.

i redid the PID auto tune and found that the Kp Ki and Kd values stored in the EEPROM were way, way off what the auto tune came with. i thought that was strange and i remember when i first did the auto tune the values i put into EEPROM were similar to in the setup manual, as they also were just now when i re-entered them.

but, the problem still exists. temp climbs too high, but doesn't seem to do it as quickly.

anyone have this problem before? or know what else i can try in order to troubleshoot this issue?

sorry if this is a n00b question.


thanks!

EDIT: i did search but didn't find a thread about the things are going on here, and im running the latest mattercontrol configured for seemecnc v 1.3, arduino 1.6.5, repetier firmware 0.91

[teoman]

For the startimg cold issue,

There is a dryrun setting where the printer goes through the motions and does not print. That option could be set by accident.

Does the overshoot in temperature stabilise down later on?

[shabbadooo]

it just keeps going up up and up. it doesn't climb as quickly since i remade the PID autotune values but still keeps going.

i stopped it around 280 a couple times, way too hot i reckon. despite the desired temp being 210 and i think max set in EEPROM being 255. powered it down else it would have kept going.

i read another post about a similar issue here

http://forum.seemecnc.com/viewtopic.php ... 449#p56449

i then set the temperature with on the LCD to 150C. same result, it went to 150 then 160 and climbing. at least when i set the temp back to 0C via LCD then it stopped heating. manually turning the extruder temp to "OFF" via mattercontrol didn't do anything previously.

[teoman]

There is something fishy going on here.

Mind posting your pid values?

[shabbadooo]

Kp (33.75) (33.75) (34.03) [33.84]

Ki (2.62) (2.58) (2.66) [2.62]

Kd (108.62) (110.52) (108.81) [109.32]

avg that i put into EEPROM in brackets. this was from tonight's autotune. what i replaced in EEPROM with these values was totally off, by multiples, but i do not believe that's what i entered initially. i would have noticed if the PID values were not close to the values in the rostock setup manual.

[stonewater]

your thermistor may have come loose in its hole.

Tom C