Hotend issue

[jmick]

All of sudden I have no purple trace on hotend test. Just a straight vertical purple line and the redline trace. The only thing different I did was to take out the 10amp auto fuse I had put in becauise my original 5amp fuse blew shortly after the 1st time I tried it. Anyway I had ordered 5amp fuse which come all the way from the Phillipines so I had to wait 2 weeks to get them. I thought well maybe that was just a weak fuse I'll try another 5 amp. One attempt and not only got vertical purple line but blew the fuse. In the meantime I saw the 10a fuse possibility and ordered 10amp fuses which should arrive today or tomorrow. Anyway my question is does the vertical line typical show up because of a thermistor problem or a resistor problem or amperage overload on the fuse? Incidently the fuses were made in the Phillipines, but came thru Mouser in Texas, which I am finding out that anything you order from Texas takes twice as long and the shipping charges at least double what I'm used to paying from other states thru Amazon.

Jmick in NV

[lordbinky]

In repetier the thin purple trace is the target temp for me, and it jumps to my set temp. The redline trace for me is the thermistor reading and that rises fast when you have good heating, but it isn't a straight jump impulse line. A screenshot would help, but no point in blowing a fuse for a screenshot.

Sounds like something is shorted though. Double check your hotend, make sure to put a multimeter to your unplugged heating resistors/cartridge and thermistor.

[jmick]

I don't know how to upload a picture on this blog.

[lordbinky]

under submit there's a tab that's blue and says options with check boxes under it, click on the tab next to it. The way the gray on dark gray works makes your eyes skip over it. I call UI elements like that hide even when you're looking for them Snakes, because I heard from my dad so many times when I was looking for something and he'd point right at it, 'If it was a snake it would've bit you!'

[jmick]

15:52:38.079 : PID Autotune start
15:54:53.706 : bias: 85 d: 85 min: 199.24 max: 201.48
15:55:01.802 : bias: 65 d: 65 min: 198.64 max: 200.56
15:55:18.806 : bias: 91 d: 91 min: 198.03 max: 200.19
15:55:18.806 : Ku: 53.77 Tu: 17.01
15:55:18.806 : Classic PID
15:55:18.806 : Kp: 32.26
15:55:18.806 : Ki: 3.79
15:55:18.806 : Kd: 68.58
15:55:30.288 : bias: 102 d: 102 min: 197.58 max: 200.56
15:55:30.288 : Ku: 43.58 Tu: 11.48
15:55:30.288 : Classic PID
15:55:30.304 : Kp: 26.15
15:55:30.304 : Ki: 4.55
15:55:30.304 : Kd: 37.54
15:55:38.806 : bias: 85 d: 85 min: 198.79 max: 200.74
15:55:38.821 : Ku: 55.42 Tu: 8.52
15:55:38.821 : Classic PID
15:55:38.821 : Kp: 33.25
15:55:38.821 : Ki: 7.81
15:55:38.821 : Kd: 35.41
15:55:38.821 : PID Autotune finished ! Place the Kp, Ki and Kd constants in the configuration.h

hotend test pic

new upload 476.gif (23.34 KiB) Viewed 5693 times

[lordbinky]

And did you read the resistance of thermistor and heating element? Also, make sure nothing funny like the leads of the thermistor being on/close enough to the heating element and heating the thermistor backwards from it's leads.

[jmick]

yes, I did all that, in fact thermistor leads are between my peek fan and the extruder so fan blows right across leads. Are the Kp, Ki, Kd figures close to what they should be. The test only last for 3 minutes, is that normal. Why don't I have the brown line like shown in the assembly instuctions?

[Cleveralias]

yes, I did all that, in fact thermistor leads are between my peek fan and the extruder so fan blows right across leads. Are the Kp, Ki, Kd figures close to what they should be. The test only last for 3 minutes, is that normal. Why don't I have the brown line like shown in the assembly instuctions?

IIRC the view is a bit different when running PID tuning compared to when just requesting a temperature. Perhaps the photo you're looking at was taken during normal operation rather than PID tuning? I gather you were able to run the PID successfully which should mean you are able to the hotend and read the temperature. If everything is working as it should I wouldn't worry too much about finding the lost line.

[jmick]

Thanks clever I'll probably try to run a part this weekend as I have to get better aquianted with the slr 3r and changing figures in the eeprom for the belts and filament feed.
Thanks for the get back.

Jmick in NV