Duet2 Wifi failed to detect E1 TEMP sensor

t9000

After adding the 2nd hotend the temperature did not shown correctly for E1/T1/Heater2. When startup, it show the temperature closed to room temp but it will gradually increasing to about 90C in few minutes when the heater is still off or even the PT100 is not connected. The sensor is good as the temperature is correct when I plug it to E0. When the sensor is unplug, the temperature for E0 will show 2000C but 90C for E1. So I believe there is some hardware problems on my broad. Some questions:

Anything I can do to fix the problem? I have some experience on reparing SMT PCB.
Could I connect the PT100 to the expansion slot directly without the Duex? If it's possible, how can I using the heater 2 with that sensor channel on firmware 2.x?

My current configuraton as follow:

M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S145 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M305 P2 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 2
M143 H2 S280 ; Set temperature limit for heater 1 to 280C

; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C
M563 P1 D1 H2 F0 ; define tool 1
G10 P1 X0 Y20 Z0 ; set tool 1 axis offsets
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C

Thanks

Veti

no idea why a normal thermistor would increase in temperature over time. have you measured the actual resistance of the thermistor?

A PT100 needs a special daughter board
see
https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors

B4138

this value is the default. you need to replace it with the actual value for your thermistors. find the value in your thermistor documentation.

t9000

@Veti said in Duet2 Wifi failed to detect E1 TEMP sensor:

no idea why a normal thermistor would increase in temperature over time. have you measured the actual resistance of the thermistor?

A PT100 needs a special daughter board
see
https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors

B4138

this value is the default. you need to replace it with the actual value for your thermistors. find the value in your thermistor documentation.

E1 also increase in temperature without the thermistor. The same thermistor is working normally on E0. I believe adc for E1 have problems.

I have using the chinese PT100 on E0 for 2 years, I have no ideas how it works.

Veti

@t9000 said in Duet2 Wifi failed to detect E1 TEMP sensor:

I have using the chinese PT100

if they are pt100 they would not work with this setting
M305 P0 T100000 B4138 R4700

t9000

@Veti said in Duet2 Wifi failed to detect E1 TEMP sensor:

@t9000 said in Duet2 Wifi failed to detect E1 TEMP sensor:

I have using the chinese PT100

if they are pt100 they would not work with this setting
M305 P0 T100000 B4138 R4700

Will figure it out later. The most important thing for me is to fix the E1 channel problem, I found that the sensor can connect to thermistors 3-7 with some special wiring to expansion port, my question is how to use H2 with thermistors 3, I can't find example gcode for firmware 2.x.

t9000

Just managed to using Heater 2 with thermistors 7 by adding X7 to M305.

The temperture reading looks fine, will double check the settings on M305.

It just a workaround solution, I still want to fix the E3 if possible.