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obaeyens
(@obaeyens)
Eminent Member
Err: MINTEMP

In the info screen the top left temperature is 14 degrees the temperature below 25 degrees.
Now my room temperature is 22.6.

The Err: MINTEMP is probably caused by an incorrect calibrated temperature sensor. It is 8 degree too low compared to real temperature.

Is there a way to calibrate this?

Posted : 27/09/2016 9:15 pm
Ben
 Ben
(@ben)
Reputable Member
Re: Err: MINTEMP

That is certainly a live chat and email to technical.

I got a false reading of the nozzle temp when I had done the screw up on the heat block a little too tight. Read 700C odd so might just be worth having a look at the screw on the heat block that holds the thermister and maybe unscrewing it just a little. If no change then screw back as was. That said, thats if you have the thermister with the screw on it.

Posted : 27/09/2016 10:24 pm
obaeyens
(@obaeyens)
Eminent Member
Topic starter answered:
Re: Err: MINTEMP

That is what I love about this printer, failures that forces to think about how it is designed.

I found the cause! The temperature sensor connector on the extruder got disconnected when I wired all the cables. What I do not understand is why it gave a temperature of 14 degrees Celsius? Why was this not 0 degrees? Or 255 degrees?

Posted : 27/09/2016 11:26 pm
David T.
(@david-t)
Noble Member
Re: Err: MINTEMP

Beacuse of the characteristics of the sensor. It is thermistor with specific electric resistance curve based on temperature.
14°C is given by resistance equal to infinity.
I hope you understand my explanation, I'm far beyond my English skill explaining this.

Posted : 28/09/2016 12:37 am
Ben
 Ben
(@ben)
Reputable Member
Re: Err: MINTEMP

I'm far beyond my English skill explaining this.

Explains a lot of your comments then 🙄

http://shop.prusa3d.com/forum/%C4%8Ceske-forum-f3

Posted : 29/09/2016 11:31 am
David T.
(@david-t)
Noble Member
Re: Err: MINTEMP

Ben, thanks for your constructive comment here. If I am wrong, how about writing better explanation instead of directing me to Czech section?

Posted : 29/09/2016 11:48 am
Ben
 Ben
(@ben)
Reputable Member
Re: Err: MINTEMP

Just trying to be like you man 😆 😆 😆 😆 😆 😆

Posted : 29/09/2016 11:49 am
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Err: MINTEMP

I think that the actual simple explanation is that when the thermistor is not connected, the processor interpolates the open circuit reading as 14 degrees..

The thermistor is part of a small circuit with a 4.7KOhm pull up resistor when the thermistor is OC, the full 5V is applied to the processor input pin, which is then interpreted by the ADC as 14 degrees.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 29/09/2016 1:12 pm
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