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    PT-100 temperature constantly at 2000 degrees after failure

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    Duet Hardware and wiring
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    • CoolM8undefined
      CoolM8
      last edited by

      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:

      [[language]]
      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:

      [[language]]
      M305 P1 X201
      
      
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      • dc42undefined
        dc42 administrators
        last edited by

        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.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • CoolM8undefined
          CoolM8
          last edited by

          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.

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          • dc42undefined
            dc42 administrators
            last edited by

            Do you have a resistor of between 100 and 200 ohms that you can connect to the terminal block in place of the PT100?

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

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            • CoolM8undefined
              CoolM8
              last edited by

              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.

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              • dc42undefined
                dc42 administrators
                last edited by

                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.

                Duet WiFi hardware designer and firmware engineer
                Please do not ask me for Duet support via PM or email, use the forum
                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                • CoolM8undefined
                  CoolM8
                  last edited by

                  Well, I've ordered a new daughter board but i still get the same issue. And no I've nothing connected to SPI bus. There is no PanelDue nor a second SD card.

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    Have you removed the PT100 sensor from the hot end or is it still installed? I'm wondering whether it may have developed a short between the element and the case.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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                    • CoolM8undefined
                      CoolM8
                      last edited by

                      It's the same even if installed in the hotend or not. If I read the voltage on the middle 2 pins I get a reading of about 2V with the E3D PT100 and about 0.2V for the Ultimaker PT100. With both those voltages i get 2000 degrees in the Frontend.

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                      • dc42undefined
                        dc42 administrators
                        last edited by

                        The 0.2V with the Ultimaker sensor sounds plausible, the 2V with the E3D one sounds like an open circuit sensor, or else it's a thermistor not a PT100.

                        If you send the M305 P1 X201 command from the Gcode Console, does it return an error message?

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

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                        • CoolM8undefined
                          CoolM8
                          last edited by

                          It is all fine when I send M305 P1 X200 or X2001, no error message whatsoever. It even turns off the fan shortly that is set to start at 40 degrees but that runs continuously now because of the 2000 degrees.

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                          • dc42undefined
                            dc42 administrators
                            last edited by

                            What voltage do you read across the outer 2 pins of the 4 pin terminal block? It should be the same 0.2V that you get across the inner ones, with the good PT100 connected.

                            Duet WiFi hardware designer and firmware engineer
                            Please do not ask me for Duet support via PM or email, use the forum
                            http://www.escher3d.com, https://miscsolutions.wordpress.com

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                            • CoolM8undefined
                              CoolM8
                              last edited by

                              Yes the outer 2 pins show 0.2 V as well. I really don't get this, why did it used to work and now nothing helps? There is nothing burnt or damaged on the duet itself.

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                              • dc42undefined
                                dc42 administrators
                                last edited by

                                My best guess is that the SPI bus isn't working but I'm puzzled that there is no error message. Do you have anything connected to the expansion connector?

                                Duet WiFi hardware designer and firmware engineer
                                Please do not ask me for Duet support via PM or email, use the forum
                                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                                • CoolM8undefined
                                  CoolM8
                                  last edited by

                                  Still no, as I've already said.

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                                  • dc42undefined
                                    dc42 administrators
                                    last edited by

                                    I suggest you ask your supplier to replace the Duet.

                                    Duet WiFi hardware designer and firmware engineer
                                    Please do not ask me for Duet support via PM or email, use the forum
                                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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                                    • CoolM8undefined
                                      CoolM8
                                      last edited by

                                      Well, I've gotten the replacement for the DuetWifi, but since i haven't seen any damage at my previous DuetWifi I haven't had big hopes and thats exaclty what it tourned out. No luck and everything is still the same, giving me a reading of 2000 degrees. I have even tried the solution from here: https://miscsolutions.wordpress.com/2016/06/25/more-delta-printer-upgrades-wifi-and-silence/.
                                      There was also the E3D PT100 sensor used and 4 wires were connected to the sensor wires.
                                      Now everything is new: the duet, the daughter board & the PT100, so it must be the configration. I have tried the following configs:

                                      • M305 P1 X200 (E3D and Ultimaker PT100)
                                      • M305 P1 T100000 B4725 C7.060000e-8 R4700 X200 (E3D PT100 only)
                                      • M305 P1 X201 (E3D and Ultimaker PT100)
                                      • M305 P1 T100000 B4725 C7.060000e-8 R4700 X201 (E3D PT100 only)

                                      what else could be the issue here?

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                                      • deckingmanundefined
                                        deckingman
                                        last edited by

                                        Maybe it's because you've set P1 to use both channels (X200 and X201). If you've only got one PT100 and it's used on the hot end, all you need is M305 P1 X200. If you are using 2 PT100s, one for the bed and one for the hot end, then you have something like M305 P0 X200 and M305 P1 X201. You don't need the thermistor and ADC parameters for a PT 100 but those lines probably just get ignored.

                                        Ian
                                        https://somei3deas.wordpress.com/
                                        https://www.youtube.com/@deckingman

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                                        • Dougal1957undefined
                                          Dougal1957
                                          last edited by

                                          Can you post your full Config.g file wonder if there is a line after the M305 that may be overriding it?

                                          Doug

                                          Ian I think the op has tried all those lines one at a time to try and get to the bottom of the issue not all at the same time

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                                          • CoolM8undefined
                                            CoolM8
                                            last edited by

                                            The strange thing is that it used to work before until it failed in the beginning of a print. Since then i only fiddled around with the M305 P1 command.

                                            [[language]]
                                            ; Configuration file for Duet WiFi (firmware version 1.17)
                                            ; executed by the firmware on start-up
                                            ;
                                            ; generated by RepRapFirmware Configuration Tool on Wed Apr 19 2017 22:18:05 GMT+0200 (W. Europe Daylight Time)
                                            
                                            ; General preferences
                                            M111 S0 ; Debugging off
                                            G21 ; Work in millimetres
                                            G90 ; Send absolute coordinates...
                                            M83 ; ...but relative extruder moves
                                            M555 P2 ; Set firmware compatibility to look like Marlin
                                            M208 X0 Y0 Z0 S1 ; Set axis minima
                                            M208 X205 Y205 Z205 S0 ; Set axis maxima
                                            
                                            ; Endstops
                                            M574 X1 Y1 Z1 S1 ; Define active high microswitches
                                            M558 P0 X0 Y0 Z0 H5 F120 T6000 ; Set Z probe type to switch, the axes for which it is used and the probe + travel speeds
                                            G31 P600 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
                                            M557 X15:190 Y15:190 S20 ; Define mesh grid
                                            
                                            ; Drives
                                            M569 P0 S1 ; Drive 0 goes forwards
                                            M569 P1 S1 ; Drive 1 goes forwards
                                            M569 P2 S1 ; Drive 2 goes forwards
                                            M569 P3 S1 ; Drive 3 goes forwards
                                            M350 X16 Y16 Z8 E16 I0 ; Configure microstepping without interpolation
                                            M92 X157.4804 Y157.4804 Z533.3333 E832 ; Set steps per mm
                                            M566 X1200 Y1200 Z480 E120 ; Set maximum instantaneous speed changes (mm/min)
                                            M203 X8100 Y8100 Z1200 E1200 ; Set maximum speeds (mm/min)
                                            M201 X500 Y20 Z250 E250 ; Set accelerations (mm/s^2)
                                            M906 X1100 Y1100 Z1100 E1100 I30 ; Set motor currents (mA) and motor idle factor in per cent
                                            M84 S30 ; Set idle timeout
                                            
                                            ; Heaters
                                            M143 S310 ; Set maximum heater temperature to 310C
                                            M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
                                            M305 P0 T10000 B3988 C0 R4700 L0 H0 ; Set thermistor + ADC parameters for heater 0
                                            M305 P1 X200
                                            
                                            ; Tools
                                            M563 P0 D0 H1 ; 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
                                            
                                            ; Network
                                            M550 PUltimaker ; Set machine name
                                            M552 P0.0.0.0 S1 ; Enable network and acquire dynamic address via DHCP
                                            
                                            ; Fans
                                            M106 P0 S1 I0 F500 H1 T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
                                            M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
                                            M106 P2 S1 I0 F500 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off
                                            
                                            ; Custom settings are not configured
                                            
                                            
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