Pinpointing Thermistor Issue

Re: Pinpointing Thermistor Issue

gmckee — Thu, 03 Mar 2016 00:12:29 -0500

Power supply is a 30a 12v supply. Input there reads 12.13v. I removed lcd and got the same result. I have attached another graph with the Temps without lcd. It hopped from 205 to 225 twice and 208 to 216 once. What is strange is that I did a 5.5hr print yesterday and Temps looked fine. The problem seems to last only in the 1st few minutes of heat up (second graph).

Re: Pinpointing Thermistor Issue

Dust — Wed, 02 Mar 2016 23:06:54 -0500

Random fluctuation could also be that the Thermistor has gotten lose from the hot end.

Can also be cased by voltage issues (power supply to weak)

I would also remove your LCD if you have one for now, as they suck lots of power from the 5v rail, see if that make it more stable.

Re: Pinpointing Thermistor Issue

Dust — Wed, 02 Mar 2016 23:02:28 -0500

Just change

#define TEMP_0_PIN 13 // (written on pcb as T0) ANALOG NUMBERING
#define TEMP_1_PIN 15 // (written on pcb as T2) ANALOG NUMBERING

to

#define TEMP_0_PIN 15 // ANALOG NUMBERING
#define TEMP_1_PIN 13 // ANALOG NUMBERING

T1, pin 14 isn't mentioned as its the bed

Pinpointing Thermistor Issue

gmckee — Wed, 02 Mar 2016 22:26:41 -0500

I have been running a E3D lite6 for a while now. Lately it has been acting very strange during heatups when it gets to 180c (see graph). One second it will be at 180c, then 230c. I have ran PID autotune and have the correct thermistor in Marlin. I want to change the thermistor input in Marlin to make sure its not an issue with T0.
I believe it is in the "pins_RAMPS_13.h" section of the firmware, with the displayed section of code. How would I change Extruder 1's temprature sensor input from "T0" to "T2" in the firmware? Note:Running a EFB setup.
"

#define TEMP_0_PIN         13   // ANALOG NUMBERING
#define TEMP_1_PIN         15   // ANALOG NUMBERING
#define TEMP_2_PIN         -1   // ANALOG NUMBERING

Any other ideas are suggested. I would like to make sure its not a problem with my setup before attempting a service claim.