mintemp error

[ii3edus]

the only way i got the printer to heat now with your firmware installed is to put the thermistors at a negative 1 (-1) and not 1 (1) like they should be. why is that?

[zhangxueyou]

When the temperature is lower than the room temperature, the temperature that thermistor detects is wrong because you set " TEMP_SENSOR_BED" to "-1". So the temperature keeps raising.
Please try to pre-set the temperature of bed a bit higher than room temp on LCD.
As you can see the annotation in "configuration.h":
//// Temperature sensor settings:
// -2 is thermocouple with MAX6675 (only for sensor 0)
// -1 is thermocouple with AD595
// 0 is not used
// 1 is 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
// 2 is 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
......
#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 1

You know, the correct value is "1"

[ii3edus]

Bed temp is set at 1. I had to set the "min temp" to -1 to even get the bed or hotend to heat at all

[ii3edus]

//--NORMAL IS 4.7kohm PULLUP!-- 1kohm pullup can be used on hotend sensor, using correct resistor and table
//
//// Temperature sensor settings:
// -2 is thermocouple with MAX6675 (only for sensor 0)
// -1 is thermocouple with AD595
// 0 is not used
// 1 is 100k thermistor - best choice for EPCOS 100k (4.7k pullup)
// 2 is 200k thermistor - ATC Semitec 204GT-2 (4.7k pullup)
// 3 is mendel-parts thermistor (4.7k pullup)
// 4 is 10k thermistor !! do not use it for a hotend. It gives bad resolution at high temp. !!
// 5 is 100K thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (4.7k pullup)
// 6 is 100k EPCOS - Not as accurate as table 1 (created using a fluke thermocouple) (4.7k pullup)
// 7 is 100k Honeywell thermistor 135-104LAG-J01 (4.7k pullup)
// 71 is 100k Honeywell thermistor 135-104LAF-J01 (4.7k pullup)
// 8 is 100k 0603 SMD Vishay NTCS0603E3104FXT (4.7k pullup)
// 9 is 100k GE Sensing AL03006-58.2K-97-G1 (4.7k pullup)
// 10 is 100k RS thermistor 198-961 (4.7k pullup)
// 60 is 100k Maker's Tool Works Kapton Bed Thermister
//
// 1k ohm pullup tables - This is not normal, you would have to have changed out your 4.7k for 1k
// (but gives greater accuracy and more stable PID)
// 51 is 100k thermistor - EPCOS (1k pullup)
// 52 is 200k thermistor - ATC Semitec 204GT-2 (1k pullup)
// 55 is 100k thermistor - ATC Semitec 104GT-2 (Used in ParCan & J-Head) (1k pullup)

#define TEMP_SENSOR_0 1
#define TEMP_SENSOR_1 0
#define TEMP_SENSOR_2 0
#define TEMP_SENSOR_BED 1

// This makes temp sensor 1 a redundant sensor for sensor 0. If the temperatures difference between these sensors is to high the print will be aborted.
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10

// Actual temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.

// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.
#define HEATER_0_MINTEMP -1
#define HEATER_1_MINTEMP 5
#define HEATER_2_MINTEMP 5
#define BED_MINTEMP -1

[zhangxueyou]

So when you are heating, can the temperature raise to the value you set?
When you are heating, please notice if the temperature is abnormal.

[ii3edus]

temp reaches set point but how accurate is it. room temp is 75 degrees f. printer display say 0.

[zhangxueyou]

Maybe the wiring of thermistor is wrong, please check carefully.

[ii3edus]

if the wiring was wrong would it not work at all.

[zhangxueyou]

Please plug the wire of themistor, then use a wire to make the 2 pin short out, as shown in the picture.
If the value is as same as before. We can conclude that something wrong with thermistor.

600px-Rapms_front_副本.jpg (92.52 KiB) Viewed 15739 times

[ii3edus]

i did that and it still say 0. so does that mean i have 2 bad thermistors cause the bed say the same as the hotend. but if i manually set the temps (230 hotend 115 bed) the printer heats up and the display shows the set temps and the actual temp climbing.