Auto tune cancelled because temperature is not increasing

qlqlo

I am still new to electronics so I dont know what could be the issue so I will leave as much information as possible.

I am trying to run heater autotuning with M303 H1 P1 S240. It runs for 60 seconds and then gives error: Auto tune cancelled because temperature is not increasing. During the minute it increases from 28.3 to 28.8°C. I supply the board with 24 V and the current in standby mode is 0.13 A and when the heating starts it is 0.26 A.

I dont know if the values in M307 are correct. The manufacturer of the pellet extruder I am trying to use suggests initial tuning values M307 H1 A940 C810 D22 S1.0 B0, but those are for old firmware version.

Here is my config.g

droftarts

@qlqlo Please post code as text, rather than images. It makes it difficult for people to respond to you, quoting your code. You can copy and paste text from DWC into your messages here. Ideally put code between the 'code' tags, which is the </> symbol on the message editing toolbar.

If the heater is turning on, but has a large mass to heat and is slow, you can increase the D ('dead time') parameter to give it longer to heat. See https://docs.duet3d.com/User_manual/Troubleshooting/Heater_faults#faults-when-tuning

Faults when tuning

M303 is used to tune heaters. You may receive the message "Auto tune cancelled because temperature is not increasing" while running M303. This happens when the temperature has not increased by at least 3C within 30 seconds + the configured dead time of the heater. It can occur on a bed heater with a large thermal mass and a weak heater. To avoid these faults:

Ensure the heater is actually working and does start to heat up when turned on.

You can temporarily increase the configured dead time for that heater. For example, sending M307 H0 D60 before sending the M303 tuning command will increase the heater 0 dead time to 60 seconds.

Ian

dc42

@qlqlo 0.26A at 24V is only about 6W which is nowhere near enough for a filament hot end let alone a pellet extruder. Are you certain that the heater is intended for 24V? Perhaps it is intended for AC mains voltage, in which case you will need a SSR to drive it from the Duet. Check the heater specification with the manufacturer of the pellet extruder.