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

[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.

[CadetC]

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

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

I don't know if more information is needed, but I would also like to confirm the temperature problem .
recorded temperature at room temperature - RRF3.4b2

recorded temperature after change to RRF3.3

I performed the following actions

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.

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

M308 S1
Sensor 1 (Hotend) type Thermistor using pin 121.temp0, reading 21.4, last error: success, T:100000.0 B:4138.0 C:0.00e+0 R:2200.0 L:-7 H:-12

2.Send M122 B121 and record the reported VIN value

M122 B121
Diagnostics for board 121:
Duet TOOL1LC firmware version 3.3 (2021-06-15 16:12:58)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
...........
VIN: 24.9V

3.Switch the tool board firmware to 3.4beta2.

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

M308 S1
Sensor 1 (Hotend) type Thermistor using pin 121.temp0, reading 3.1, last error: sensor not ready, T:100000.0 B:4138.0 C:0.00e+0 R:2200.0 L:-7 H:-12

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

m122 b121.0
Diagnostics for board 121:
Duet TOOL1LC firmware version 3.4.0beta2 (2021-08-03 10:00:09)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
...................
VIN: 24.9V

6.Run the calibration procedure described at https://duet3d.dozuki.com/Wiki/Calibrating_thermistor_and_PT1000_readings on the tool board
thermistor disconnected

M308 S1 H999
Measured H correction for port "121.temp0" is 47

jumper across each thermistor input

cM308 S1 L999
Error: M308: Computed correction is not valid. Check that you have placed a jumper across the thermistor input.ode_text

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

M308 S1
Sensor 1 (Hotend) type Thermistor using pin 121.temp0, reading 21.4, last error: success, T:100000.0 B:4138.0 C:0.00e+0 R:2200.0 L:-12 H:47

8.Check whether the readings are now correct
reading at room temperature seems to be OK.

but how i can be sure about high temps?

[dc42]

@cadetc thanks for your test results. I recommend you revert the tool board firmware to 3.3 and recalibrate, until I have identified and fixed the problem. You can continue running 3.4beta2 on the main board.

[CadetC]

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

@cadetc thanks for your test results. I recommend you revert the tool board firmware to 3.3 and recalibrate, until I have identified and fixed the problem. You can continue running 3.4beta2 on the main board.

so if iI go back to 3.3 for toolboard and if in config-override.g i'll put this line then i should be OK? (original factory values before calibration done in RRF3.4b2)

 M308 S1 L-7 H-12

Hot to store this back in to nonvolatile memory?

[dc42]

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

Hot to store this back in to nonvolatile memory?

If you ran M308 S# H999 (where # is the sensor number) then it has already been stored. Similarly for M308 S# L999.

[dc42]

@CadetC @pixelpieper @Serge I am still trying to determine why I don't see this issue on my tool boards. Please can you each run M122 B# where # is the tool board number, and tell me what bootloader version it reports.

[CadetC]

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

@CadetC @pixelpieper @Serge I am still trying to determine why I don't see this issue on my tool boards. Please can you each run M122 B# where # is the tool board number, and tell me what bootloader version it reports.

M122 B121
Diagnostics for board 121:
Duet TOOL1LC firmware version 3.3 (2021-06-15 16:12:58)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1

[dc42]

@cadetc thanks, it's not the bootloader version then.

@CadetC @pixelpieper @Serge I have identified a possible cause of this issue. Please try the new tool board firmware at https://www.dropbox.com/sh/cq7q3g8coymo9s3/AABtPYEzV1_unETpKEMPInSia?dl=0. If with this version you find the temperature error is much reduced, then please re-run the temperature calibration and report the new H and L values. If you still get large errors with this version, then just revert the tool board firmware to 3.3.

[pixelpieper]

@dc42 I installed the firmware, I get a temperature rise from 35 to arround 65 degrees with the 3.3 H & L values. When trying to calibrate:

M308 S1 H999
Measured H correction for port "121.temp0" is 48

M308 S1 L999
Error: M308: Computed correction is not valid. Check that you have placed a jumper across the thermistor input.