I keep reaching max temp/ printer halting.

I'm trying to run my 24V printer fast with a 0.6mm nozzle. I need lots of heat to prevent cold extrusion during the print. Here's my settings:

Marlin Config:
#define HEATER_0_MAXTEMP 325
#define HOTEND_OVERSHOOT 15

BTT Touchscreen Config:
max_temp:T0:340 T1:340 T2:340 T3:340 T4:340 T5:340 BED:100 CHAMBER:60

Up until now these have been fine. Ever since I started setting the hotend to 300deg I get that error. Even at 295 I get that error. Am I missing a setting somewhere? Is it hardcoded? Where do I disable this protection if so?

Thanks.

Edited 1 time(s). Last edit at 04/30/2022 03:37AM by CVRIV.

most thermistor tables top out at 300c, so you cannot exceed that

Check your thermistor table

... for higher temperatures I'm using PT100 sensors - they are "safe" for up to 600degC and tested two in a "sandwich" (back to back, one as heater, the other as sensor) for something like 800degC.

But you'll need at least 12Bit ADC (my sensor was an AduC847 with 24Bit) or a PT1000 or a specific driver for PT100, what's not cheap neither ...

Viktor

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Viktor
--------
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Quote
VDX
... for higher temperatures I'm using PT100 sensors - they are "safe" for up to 600degC and tested two in a "sandwich" (back to back, one as heater, the other as sensor) for something like 800degC.

But you'll need at least 12Bit ADC (my sensor was an AduC847 with 24Bit) or a PT1000 or a specific driver for PT100, what's not cheap neither ...

Viktor

Agreed. The latest Marlin includes MPC temperature control for the hot end, which is vastly superior to PID. The gentleman who developed MPC also fixed the ongoing 12 bit issue with Marlin ADC's.

Edited 1 time(s). Last edit at 04/30/2022 06:50PM by rq3.