measured temperature extruder too high
January 26, 2011 07:53AM
my mendel is finally ready to go, however the thermistor measures a temperature of about 800c as soon as i hit the "switch heater on" button. I guess this is also the reason why the wire doesn't start heating.

I have double checked if the wires are connected correctly and there is no short-circuit. I have uploaded the latest firmware for gen6 that works with the g550 thermistor, so the thermistor settings should also be ok.

any suggestions?
Re: measured temperature extruder too high
January 26, 2011 08:14AM
Measure the resistence of the thermistor at room temperature.
ASS-U-ME that it is a 100k thermistor you should be reading around that...


Bob Morrison
W├Ârth am Rhein, Germany
"Luke, use the source!"
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Re: measured temperature extruder too high
January 26, 2011 10:07PM
I had the same issue - the leads crossed at one point, they are not insulated. This is a NTC resistor, so the resistance gets lower with higher temperature.
[en.wikipedia.org]
[en.wikipedia.org].
Maybe the leads touch right at the beginning.
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