Heater Error.

dc42

I agree, fast changes in the temperature reading normally indicate a bad connection. If the changes are spikes to 2000C when using a thermocouple or PT100 sensor, then they can also be caused by interference.

A temperature drop when the print cooling fan turns on at the end of the first layer is quite common, but takes place over a few seconds.

TwoTone

I'm using a Thermistor and no cooling fans. I'll check the wiring again.

The temp will start to fluctuate during the calibration before it even starts to print.

dc42

Also check for shorts between the thermistor wires and the heater block.

c310

I have the same error "Error: heating fault on heater 1, temperature excursion exceeded 15.0C" it only appears when i start printing 2nd model without duet reboot. printer prints part of the skirt and gives this error.

once i reboot board by emergency stop web button, all works fine.

any ideas how to avoid it?

dc42

The simplest way is to increase the allowed temperature excursion using M570. Alternatively you can adjust the heater model, but I'd need to see the temperature graph up to where the fault occurs to make recommendations.

njjn2020

David,

i made a PDF with screenshot.
https://1drv.ms/b/s!AhtLyZEPcjv9_GNtn-CM1EyRmnRE

and link to .gcode file
https://1drv.ms/u/s!AhtLyZEPcjv9_Fhyuk9SPmn5IX_s

c310

i can not edit my post

can you print my file with 1.18 firmware? (part is very small) ?

dc42

Looks like you had a large temperature overshoot. Have you auto tuned the extruder heater?

If you did tune the extruder heater and you haven't made any changes to the hot end or power supply since then, try increasing the A parameter in the M307 H1 command by 10%. Note, this command may be in config-override.g if you have used M500.

c310

well, M303 does not calibrate to the end. there is and error on phase 2:

https://1drv.ms/i/s!AhtLyZEPcjv9_G_gcF96GUOn0vy3

how can i run thermal calibration with no errors?
do i need to put something else to config file?

these are values from config-override.g

[[language]]
; Heater model parameters
M307 H0 A90.0 C700.0 D10.0 S1.00 B1
M307 H1 A340.0 C140.0 D5.5 S1.00 B0
M307 H2 A340.0 C140.0 D5.5 S1.00 B0
M307 H3 A340.0 C140.0 D5.5 S1.00 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 B0
M307 H6 A340.0 C140.0 D5.5 S1.00 B0
M307 H7 A340.0 C140.0 D5.5 S1.00 B0

and i have in config

[[language]]
M305 P1 T100000 B4250 R4700 H30 L0

dc42

Reduce the target temperature in M303 or increase the temperature limit in M143.

njjn2020

solution is in this forum here -> https://www.duet3d.com/forum/thread.php?pid=14276#p14276