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Thermal runaway, mintemp error #2844
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Is the temperature showing room temperature. Does it react on warming with fingers/lighter? |
Hi, |
If the PID regulation is active (near the set temperature) it is a 50/50 chance if the heater stays on or off. |
As long your thermometer is not working proper - please don't try the heater. Your risking fire. No feedback - no regulation. Do you use a premade MAX6675 module, or a naked chip. Anyway a pull up should not be needed. |
Hi much thanks for the answer. I use the pin D22 marked in schematik. Normally this pin is free on Ramps1.4. The temperature measurement is working with this pin as CS. But when a error occurs the software shows the wrong reaktion (in my opinion). The reaction (heater on on error) can cause with: Best regards |
The heater stays also on if kill switch confirmed. With #define BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE the Heater switch off in case of above named errors. |
Ensure that the thermocouple is the correct polarity. Also use the SPI port pins mentioned in the header file. This gives the On Tue, Dec 15, 2015 at 4:23 AM, boaschti notifications@github.com wrote:
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How is your heater connected? Direct, or with some additional electronic, like an SSR or solenoid? Is there any possibility the heater signal could be inverted there? |
I use the normal SPI Port. Only for CS i use D22. I tested for you D66 for CS (original in pins_RAMPS_13.h). It's the same reaction. I suppose before. The polarity of themocouple is OK. https://www.youtube.com/watch?v=L29cI9Y7Mzs&feature=youtu.be Here you can see the red light (Heater). The Oszi shows Sck and MISO. It stays on after kill Switch is pressed. Kill Funktion is also called if define BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE is not set and a temperature error occurs. (So same reaction). |
Got it.
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Thank you, thats it. It works with kill button. Best Regards |
This has been patched in |
@thinkyhead |
@Blue-Marlin Hmm, somehow I though @AnHardt's fix already got through. I will make sure it gets into |
This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs. |
Hi,
I'm using Marlin 1.1.0 RC3. I built my Printer with a Ramps 1.4 (EEB), Max6675 and REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER. CS of Max6675 is D22. On first starts i had the problem that always mintemp error occurs. The solution was a pullup DO-5V. Now the heater was working. While heating a mintemp error occurs (because DO/MISO is 0V) marlin detected it and stops the software, no reaction on incremental encoder ect.... BUT the problem: The Heater stays on and no measuerment is taken from software! I checked with my oszi reproduceable. I think the heater will heat until thermal dead or fire.
Best regards S.Weisser
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