I had the issue on the first print after finally fixing the homing config issue, that the temperature reading showed "Failure". I had to turn the printer off and on again in order to get it working again. Sadly after it failed a second time and it went into reading 2000 degrees ever since then. I'm using a PT-100 sensor and the daughter board and i even switched to the second RTD Pin but it's still reading 2000 degrees. I've even replaced the sensor with no luck.
Does it read 2000 even with just usb power? If so then you have a bad connection, either in the wiring between the daughter board and the sensor, or the links you use for 2-wire connection are not working. Use a multimeter to check the wiring. The resistance of the sensor should should be a little over 100 ohms at room temperature.
Duet WiFi hardware designer and firmware engineerhttp://www.escher3d.comhttps://miscsolutions.wordpress.com
The other possibility that happened to me was electrical interference from the extruder stepper. So every time I fed filamenthe PT100 went to 2000C and tripped out on safety. To solve it I ran double shielded super flex microphone cable between the duetwifi and the PT100, no issues in 3+months. PS only earth it at the duetwifi end if you do this.
Last edited by gzcwnk (18 April 2017 08:01)
The issue still exists if only connect through USB. As this setup has worked before i don't think that there is any interference. I'm using the E3D PT-100 sensor but the strange thing is that i cannot measure any resistance not with the sensor that used to work nor with the new sensors that hasn't been used before. I have also another PT-100 sensor where i can measure its resistance to be around 100 Ohms, but the issue with the 2000 degrees still exists.
When you say you cant measure any resistance, is that with the PT100 connected to the daughterboard? if so then please try with it not connected to the daughterboard. At that point if it is not ~100R then you have a issue in the sensor or the wiring.
Duet Wifi Hardware Designerwww.duet3d.comwww.think3dprint3d.com
No, i cannot measure it when sensor is not connect to the daughterboard. But it seems still strange, it would mean I have two new E3D PT100 sensors that do not work? But even with the PT100 sensor from the Ultimaker Original where i can measure the resistance I sill have the same issue with the temperature reading. This would mean i have 2 issues at hand and even with the same setup that used to work before it went 2 times into failure. This is utterly strange.
Did you inspect the PWB board and connectors to make sure that none of the circuit traces are broken or if there is damage on the solder joint or connector?
I don't see anything that any of the circuit traces are broken nor does anything look damaged.
With the reprapfirmwar tool i get this config for the E3D thermistor:
M305 P1 T100000 B4725 C7.060000e-8 R4700 X201 ; Set thermistor + ADC parameters for heater 1 and remap it to channel 201
But i also tried everything else even:
M305 P1 X201
Do you have the PT100 connected to the first or second channel on the daughter board? 201 is the second channel, the first is 200.
Right now i have on the second channel. As I've said, it used to work on channel 1 until the failures and since then it doesn't even work on channel 2.
Do you have a resistor of between 100 and 200 ohms that you can connect to the terminal block in place of the PT100?
No i don't have a resistor around but i think this won't make a difference. Since the Ultimaker Original has a measurable resitance of around 100ohms. It measures like in the image below (the green connection has around 110 ohms):
It seems to me that the issue is with the daughter board or the duet itself.
Last edited by CoolM8 (23 April 2017 09:44)
Do you have anything else connected to the SPI bus, for example a ribbon cable connecting the CONN_SD port on the Duet to the PanelDue for using a second SD card?
If the answer is no, please ask your supplier for a new daughter board.