BLtouch not deploying / PID auto tune issues

[gloomyandy]

@Casugo Sorry I've really no idea, those heating rates seem very slow for the type of heater you are using, but they are not as slow as some bed heaters. Are you sure that they can ever reach the target temperatures you are trying to use? So for instance if you simply connect the heater cartridge directly to 24V and monitor the temperature using DWC how long does it take to reach your target temperature? Obviously make sure you do not leave this test set up running unattended!

[Casugo]

@gloomyandy

Yes, the heaters are capable of reaching the desired temperature as when I heat them they do it without problem. However, I am encountering difficulties with PID tuning. Also, when I attempt to initiate a print, the heaters initially reach the target temperature, but at the moment it start the printing process, they suddenly shut off, and all temperature readings show 2000. I'm uncertain whether this issue is pobably related to incomplete reception of the 24V power supply or if there's interference between the thermocouples and the stepper motors causing this problem.

[gloomyandy]

@Casugo Can you post a screenshot of the temperature graph when heating "normally" so that we can see how the temperature rises and how long it takes to reach your target temperature of 180.

[Casugo]

@gloomyandy

Update:

I simultaneously heated all three heaters, and the following are the results:

Heater 3 displayed an error: "T0 Error: Heater 3 fault: temperature rising much more slowly than the expected 0.5°C/sec" (Fig 1).

While the other heaters continued to heat up, they reached the desired temperature after approximately 14 minutes for heater 1 (Fig 2) and 13 minutes for heater 2 (Fig 3)."

Fig 1

Fig 2
Fig 3

[gloomyandy]

@Casugo When you are tuning I assume you are just using a single heater? If so, could you just run a single heater in "normal" mode and post the graph from that.

[Casugo]

@gloomyandy

I heated the first heater, and it took approximately 20 minutes to reach the desired temperature.

[gloomyandy]

@Casugo I've checked the code and it looks like RRF only allows a maximum time of 7 minutes for a hotend heater to reach the target temperature. It allows 30 minutes for a bed or heated chamber. So unfortunately it looks like your heater is too slow to be PID tuned as a hotend. You may be able to get it to tune by temporarily configuring it as a bed or chamber heater and getting the PID settings that way? If that does not work then I think you may have to set the heater parameters by hand, or ask DC42 to make changes to allow a longer heat up period.

The code in question is here: https://github.com/Duet3D/RepRapFirmware/blob/3.4-dev/src/Heating/LocalHeater.cpp#L677

[Casugo]

@gloomyandy
Thank you so much!!!
I'll try to do it in that way.

I have another question.

I sent a test print, and although the heaters reached the desired temperature, once the temperature was reached and it was about to start printing, the print job paused, and all temperature indicators suddenly showed 2000 (fig 1). Additionally, an error appeared in the console:

---

Error: Temperature reading fault on heater 1: sensor short to other wiring
Error: Temperature reading fault on heater 2: sensor short to other wiring
Error: Temperature reading fault on heater 3: sensor short to other wiring
Resume state saved

fig1

Is the issue you mentioned related to this error as well?

Thanks.

[gloomyandy]

@Casugo That issue looks more like some sort of wiring issue to me, I don't think it can be caused by any sort of firmware problem.

[Casugo]

@gloomyandy

Okay, I'll check on the wiring and the tuning in heater chamber mode :).

Thank you and have a good day :D.

[Casugo]

@gloomyandy
Hello!!

I configurated each heater as a heated chamber and I was able to do the tunning.

Thank you a lot