After updating to 3.4.0beta2: faulty heater 1, -273.1C.

[empi00]

I can confirm also a kind of this bug.

Before the update I had around 29°C on the HotEnd.

M308 S1 P"121.temp0" Y"thermistor" A"HotEnd" T100000 B4725 C7.06e-8

[empi00]

@empi00
Flashing back to 3.3 and:

PS: Using Duet3 with SBC and Toolboard 1.1

[dc42]

@empi00 I am wondering whether it just needs different calibration. Please can you:

1. Send M308 S1 (assuming the tool board thermistor is Sensor 1) and record the result, in particular the H and L values.
2. Send M122 B121 and record the reported VIN value
3. Switch the tool board firmware to 3.4beta2.
4. Send M308 S1 again, check that it reports the same H and L
5. Send M122 and check tna the reported VIN value is the same as before
6. Run the calibration procedure described at https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings on the tool board thermistor input. If it's tricky to do the short-circuit calibration test, just do the open-circuit calibration, which should be sufficient to correct the reading at room temperature.
7. Send M308 S1 again to see the new H and L values
8. Check whether the readings are now correct.

I am assuming that you do not have H and L parameters in your M308 commands in config.g, so it will use the values stored in NVRAM.

[chrishamm]

@serge said in After updating to 3.4.0beta2: faulty heater 1, -273.1C.:

NullReferenceException

If you manage to reproduce this, please open a Linux console and send journalctl -u duetcontrolserver -e --no-pager and send me the output. It should contain the stack trace of the underlying exception, which should make it easier for me to fix.

[uneumann36]

Hey guys.
So i am not an expert in programing stuff.

I change a lot on my modified Ender5 in the last week.
Try different hotends (THC-01 , Cyclops+ original , Cyclops fake , 2 in 1 out)
Update to capacitive sensor........

Everytime i got bad printing results. Lot of stinging and so on.

Today, i swop back to firmware 3.3.0 and print the same stinging test what was on the sd cart.
I am supprised!
Have a look on the picture yourself.
I do not know if it has to do with the firmware...
But i only change the firmware.

Don´t understand me wrong, i like duet products, and this should only help you.

[dc42]

@uneumann36 hanks for your feedback. It would be helpful if you could run the tests that I asked for in my response to @empi00, which is about 3 posts before this one.

[empi00]

@dc42
I will.
But i can only do it wednessday earlierst, as I am out with my family the next days!

[dc42]

BTW I am running two tool boards in one of my machines, and I don't see this issue. I've already reviewed all the code changes twice looking for changes that might be relevant.

[pixelpieper]

If you need an other datapoint: it also happens with PT1000.

(Duet 3 Mini5+ / Duet 1LC V1.1)

[dc42]

@pixelpieper thanks for that. It looks like something is affecting the ADC accuracy. It may be just a timing issue affecting the calibration, which is why I would like users who experience this issue to measure the H and L values that are set by the calibration process. Version 1.1 tool boards are calibrated during manufacture using firmware 3.3.

[Serge]

@dc42 Thanks, it seems to work now. But cannot make a M308 S1 L999.

[Serge]

@chrishamm said in After updating to 3.4.0beta2: faulty heater 1, -273.1C.:

journalctl -u duetcontrolserver -e --no-pager

Journal.txt

[dc42]

@serge said in After updating to 3.4.0beta2: faulty heater 1, -273.1C.:

@dc42 Thanks, it seems to work now. But cannot make a M308 S1 L999.

Please explain what you mean by that.

[Serge]

@dc42 said in After updating to 3.4.0beta2: faulty heater 1, -273.1C.:

@empi00 I am wondering whether it just needs different calibration. Please can you:

1. Send M308 S1 (assuming the tool board thermistor is Sensor 1) and record the result, in particular the H and L values.
2. Send M122 B121 and record the reported VIN value
3. Switch the tool board firmware to 3.4beta2.
4. Send M308 S1 again, check that it reports the same H and L
5. Send M122 and check tna the reported VIN value is the same as before
6. Run the calibration procedure described at https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings on the tool board thermistor input. If it's tricky to do the short-circuit calibration test, just do the open-circuit calibration, which should be sufficient to correct the reading at room temperature.
7. Send M308 S1 again to see the new H and L values
8. Check whether the readings are now correct.

I am assuming that you do not have H and L parameters in your M308 commands in config.g, so it will use the values stored in NVRAM.

Hi dc42, this is for that.

[dc42]

@serge what were the values reported by M308 S1 before and after you ran the M308 S1 H999 command?

[Serge]

@dc42 H-8 L-13
after the calibration, H51 L-13, but i can't calibrate with M308 S1 L999

[dc42]

@serge said in After updating to 3.4.0beta2: faulty heater 1, -273.1C.:

@dc42 H-8 L-13
after the calibration, H51 L-13, but i can't calibrate with M308 S1 L999

Thanks. Do you mean you can't calibrate because you can't easily short the pins TEMP0 together?

[pixelpieper]

@dc42 I went through your Procedure, I hope it helps:

Send M308 S1 (assuming the tool board thermistor is Sensor 1) and record the result, in particular the H and L values.

Sensor 1 (Hotend) type PT1000 using pin 121.temp0, reading 20.8, last error: sensor not ready, R:2200.0 L:-8 H:-12

Send M122 B121 and record the reported VIN value

VIN: 24.4V

Switch the tool board firmware to 3.4beta2.

Send M308 S1 again, check that it reports the same H and L

Sensor 1 (Hotend) type PT1000 using pin 121.temp0, reading 6.6, last error: sensor not ready, R:2200.0 L:-8 H:-12

Send M122 and check tna the reported VIN value is the same as before

VIN: 24.3V

Run the calibration procedure described at https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings on the tool board thermistor input. If it's tricky to do the short-circuit calibration test, just do the open-circuit calibration, which should be sufficient to correct the reading at room temperature.

H: works

L: M308 S1 L999

Error: M308: Computed correction is not valid. Check that you have placed a jumper across the thermistor input. 

(I did jumper the input and I verified that it shorts correctly)

Send M308 S1 again to see the new H and L values

Sensor 1 (Hotend) type PT1000 using pin 121.temp0, reading 2000.0, last error: short-circuit in sensor, R:2200.0 L:-8 H:52

Check whether the readings are now correct.

NO, the temperature actually dropped by 2 degrees.

[pixelpieper]

@dc42 one more point: I did downgrade the 1LC V1.1 back to 3.3 and repeated the calibration procedure, worked without issues.

[dc42]

@pixelpieper thanks for that data. That gives me something to work on.