PT1000 Temperature readout minus (-)225 degrees

Hi All,

I'm building/testing my first VCore 3.1 500 with EVA toolhead, Phaetus Raido v2 UHF PT1000, Octopus 1.1 with EBB42 toolboard

After a few day's of print still tuning the machine it suddenly stopped.

MCU toolboard shutdown ADC out of range.

I tried 3 different PT1000 with no change.
Then i added min max temperature just to see what the PT1000 is measuring.

sensor_type: PT1000
pullup_resistor: 2200
min_temp: -273.15
max_temp: 300

I have the jumper on the EBB42 toolboard placed.

The temperature readout is minus 225,4 degrees Celsius!
I have no clue what causes it.

Any suggestions. Your help is much appreciated.

printer.cfg16.51KB

TheTik•7/5/24, 4:38 PM

have you tried without the pullup resistor entry in printer.cfg?

TheTik•7/5/24, 4:38 PM

I have an EBB42 / PT1000 and don't have that line, working fine

TheTik•7/5/24, 4:40 PM

Also wondering if the thermistor or wiring has a short. As the temp goes down, it will have a lower and lower resistance. So if there is a short, it would report a very low temp.

WernerSOP•7/5/24, 4:51 PM

hi and thanks

WernerSOP•7/5/24, 4:52 PM

yes i tried without pullop resistor entry and it made no difference

WernerSOP•7/5/24, 4:53 PM

also tried 3 diferent PT1000 with no short.

WernerSOP•7/5/24, 4:53 PM

mabey the ebb42 board?

WernerSOP•7/5/24, 4:55 PM

just measured the PT1000 on the pins on back of ebb42 1088ohms. Seems fine

TheTik•7/5/24, 5:13 PM

maybe the ebb42 board then. There are some jumpers on the board, don't recall what they all are off the top of my head and i'm in the middle of a painting project. Find those and make sure they're right? Then yeah, it might be worth getting a replacement board from wherever you got it

chicken•7/5/24, 5:21 PM

You sure you got it on the two right pins? I accidentally put it on one of the pt1000 and one of the 120R pins the first time. Luckily I didn’t power it on and caught it as it could have caused damage I assume.

WernerSOP•7/5/24, 5:28 PM

yep used the right pins.

WernerSOP•7/5/24, 5:29 PM

i'm afraid i have an broken ebb42 as it was working and just stopped. I was changing the nozzle when it happened.

chicken•7/5/24, 5:31 PM

Strange. I could see it as a config issue of some sort if this was a new build but if it was working

chicken•7/5/24, 5:33 PM

If you are going to just replace it as the next step it might be worth trying to use a soldering iron and reflow the solder joints on the pt1000 plug and around that jumper on the back side. Worst case it’s still broken

chicken•7/5/24, 5:33 PM

Might just be a cracked solder joint

TheTik•7/5/24, 7:10 PM

I don't think that'd fix a short, but it won't hurt to try

WernerSOP•7/5/24, 7:26 PM

i tried soldering the joints. But again no difference. I will order an new ebb42 to see what it does

WernerSOP•7/5/24, 7:28 PM

also i do not measure an short. It measures 1088 ohm on the pins of the connector measured on the back of the boards. To me it seems only an broken board can be the cause. Lets see

WernerSOP•7/14/24, 8:27 AM

I received the new EBB42 and it worked initially. It seems I fried the previous one. However, after 15 minutes, it stopped working again (same issue) when I touched the nozzle (while it was off). I couldn't get it to work after that. I suspect it's due to ESD, as I had noticed some ESD shocks when touching metal furniture before. So, I bought another EBB42 and some ESD protection. I installed the new one, and it is working fine now. Has anyone noticed something similar?

PT1000 Temperature readout minus (-)225 degrees

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