Heater 1 fault

gabi68

Hi,

I have the notorius error heater 1 fault. I g=have a PT100 and when I power the duet the leds are on and the interface reports Heater1 fault. If I put the provided resistor between pin 2 and 3 on the PT100 leds go off and temperature is 0C (as is should) meaning all is working. Still that fault after disconnecting the resistor.

config duet sd card.g

droftarts

@gabi68 Sounds more like a wiring issue, or a failed PT100. If you have a multimeter you can check the resistance on the wires; use this table to check the resistance of the PT100 at different temperatures: https://www.sterlingsensors.co.uk/pt100-resistance-table

PT100 will be more reliable if you wire it 4-wire, too; see https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/

When using a 2-wire PT100 sensor, any additional resistance in the wires and connections between the sensor and the electronics will cause an increase in the reading, by about 1°C per 0.4 ohm. This inaccuracy can be avoided by using a 4-wire connection. So I chose the 4-wire configuration for greatest accuracy. However, as long as you are careful to make good connections, the sensor will work just fine in 2-wire mode and you can save some wiring.

Wiring a 2-wire PT100 as 4-wire is further down the page. Also see this post re loose connections at the cartridge, and avoiding running wires near high current wires: https://forum.duet3d.com/post/35691

Ian

gabi68

Tryed that still nothing. Connections are as follows:
Smart efector side Duet side
Pin 1 Unconnected
Pin 2 Pin 2 PT100
Pin 3 Pin 3 PT100
Pin 4 Unconnected

Input 2
H+ to E0 VIN
H- to E0-

config.g
; Heaters
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P1 X200 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C

The z probe flash twice at startup and reacts on every tap.
Led and fan working properly.
Having the prvided resistor between pin 2 and 3 on the PT100 report 0 C
Still heater 1 fault.
Before order a thermistor (bed is working like that very accurate), what else should I do?

Thank you
Gabi

jay_s_uk

Do you have the jumper fitted for 2 wire PT100 on the smart effector?
Have you tried connecting the PT100 directly to the daughter board?

gabi68

@jay_s_uk
The jumpers are in place. PT100 is inseterd and plastic prong is in place. Anything else, please?

jay_s_uk

I would suggest checking the PT100 with a multimeter to make sure the resistance reading is correct.
I would also use a multimeter to check your point to point wiring to make sure there are no breakages in the cable or poorly made crimps.

droftarts

@gabi68 Would have been good to mention you were using a Smart Effector! Have you actually measured the resistance of the PT100? You need to check at each connector. I don't see how this is a config/Duet issue, as you get 0ºC with the resistor.

Ian

gabi68

@droftarts
I just checkit. The resistance is under 1 ohm and the continuty is there for all cables. According to the PT100 resistance table I should see values between 107 and 111 ohm.
I agree is not a duet issue, but this (PT100) is sold like an addon for duet. Any advice, please?

Gabi

droftarts

@gabi68 Contact the seller and ask for a warranty replacement, as the PT100 seems to be faulty. I'd connect the 100ohm resistor to the pins on the SmartEffector, which should check continuity and for any extra resistance/short in the wiring.

Ian