Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Problem with the chamber's PT1000 thermistor

    Scheduled Pinned Locked Moved Solved
    General Discussion
    3
    19
    721
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • Juan Estanislaoundefined
      Juan Estanislao @droftarts
      last edited by

      @droftarts thank you very much for your answer.

      Sorry for the confusion of the "Heater 4" image. The image is taken from a test I did before changing it to "Heater 3" but the problem is the same on all pins.
      I post the entire config.g changed to "Heater 4" to match the image.

      code_text
      
      ; Configuration file for Duet WiFi (firmware version 3.3)
      ; executed by the firmware on start-up
      ;
      ; generated by RepRapFirmware Configuration Tool v3.3.15 on Thu Nov 24 2022 23:03:50 GMT+0100 (hora estándar de Europa central)
      
      ; General preferences
      M575 P1 S1 B57600                                  ; enable support for PanelDue
      G90                                                ; send absolute coordinates...
      M83                                                ; ...but relative extruder moves
      M550 P"Estanisleitor 2P"                           ; set printer name
      
      ; Network
      M552 S1                                            ; enable network
      M586 P0 S1                                         ; enable HTTP
      M586 P1 S0                                         ; disable FTP
      M586 P2 S0                                         ; disable Telnet
      
      ; Drives
      M569 P0 S1                                        ; physical drive 0 goes forwards
      M569 P1 S1                                        ; physical drive 1 goes forwards
      M569 P2 S0                                         ; physical drive 2 goes forwards
      M569 P3 S1                                        ; physical drive 3 goes forwards
      M569 P4 S1                                         ; physical drive 4 goes forwards
      M584 X0 Y1 Z2 E3:4                                 ; set drive mapping
      M350 X16 Y16 Z16 E16:16 I1                         ; configure microstepping with interpolation
      M92 X239.80 Y239.80 Z2414.00 E362.80:362.80        ; set steps per mm
      M566 X900.00 Y900.00 Z400.00 E120.00:120.00         ; set maximum instantaneous speed changes (mm/min)
      M203 X6000.00 Y6000.00 Z400.00 E1200.00:1200.00    ; set maximum speeds (mm/min)
      M201 X200.00 Y200.00 Z20.00 E250.00:250.00         ; set accelerations (mm/s^2)
      M906 X1700 Y1700 Z1700 E1100:1100 I30              ; set motor currents (mA) and motor idle factor in per cent
      M84 S30                                            ; Set idle timeout
      
      ; Axis Limits
      M208 X-45 Y0 Z0 S1                                  ; set axis minima
      M208 X480 Y393 Z406 S0                             ; set axis maxima
      
      ; Endstops
      M574 X1 S1 P"xstop"                                ; configure switch-type (e.g. microswitch) endstop for low end on X via pin xstop
      M574 Y2 S1 P"ystop"                                ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin ystop
      M574 Z2 S1 P"zstop"                                ; configure switch-type (e.g. microswitch) endstop for high end on Z via pin zstop
      
      :Z-Probe
      M950 S0 C"exp.heater3"
      M558 P9 C"^zprobe.in" H5 F120 T6000 ; FW v3 BLTouch connected to Z probe IN pin
      M558 H30      ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
      G31 P500 X-32 Y13 Z2.9 ; Set Z probe trigger value, offset and trigger height
      M557 X20:400 Y30:350 S50 ; Define mesh grid
      M915 X Y S5 R2
      M950 H3 C"nil"   ; Disable heaters H3-H7 to free up pins
      
      
      ; Heaters
      M308 S0 P"e0temp" Y"pt1000"                        ; configure sensor 0 as PT1000 on pin e0temp
      M950 H0 C"e0heat" T0                               ; create nozzle heater output on e0heat and map it to sensor 0
      M307 H0 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
      M143 H0 S450                                       ; set temperature limit for heater 0 to 450C
      M308 S1 P"e1temp" Y"pt1000"                        ; configure sensor 1 as PT1000 on pin e1temp
      M950 H1 C"e1heat" T1                               ; create nozzle heater output on e1heat and map it to sensor 1
      M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
      M143 H1 S450                                       ; set temperature limit for heater 1 to 450C
      M308 S2 P"bedtemp" Y"pt1000"                       ; configure sensor 2 as PT1000 on pin bedtemp
      M950 H2 C"bedheat" T2                              ; create bed heater output on bedheat and map it to sensor 2
      M307 H2 B0 S1.00; disable bang-bang mode for the bed heater and set PWM limit
      M570 H2 P1200 T70									; comando añadido porque tarda mucho en calentar la cama y daba error
      M140 H2                                            ; map heated bed to heater 2
      M143 H2 S180                                       ; set temperature limit for heater 2 to 180C
      M308 S4 P"e4temp" Y"pt1000" R4700                 ; configure sensor 4 as PT1000 on pin duex.e4temp
      M950 H4 C"exp.heater4" T4                          ; create chamber heater output on duex.e4heat and map it to sensor 4
      M307 H4 B0 S1.00                                   ; disable bang-bang mode for the chamber heater and set PWM limit
      M141 H4                                            ; map chamber to heater 4
      M143 H4 S90                                        ; set temperature limit for heater 4 to 90C
      
      ; Fans
      M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
      M106 P0 C"Ventilador De Pieza" S0 H-1              ; set fan 0 name and value. Thermostatic control is turned off
      M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
      M106 P1 C"Ventilador De Cabezal" S1 H-1            ; set fan 1 name and value. Thermostatic control is turned off
      M950 F2 C"fan2" Q500                               ; create fan 2 on pin fan2 and set its frequency
      M106 P2 C"Ventilador De Cámara" S0 H2 T90          ; set fan 2 name and value. Thermostatic control is turned on
      ; Tools
      M563 P0 S"Material Base" D0 H0 F1                  ; 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 S"Soporte" D1 H1 F1                        ; define tool 1
      G10 P1 X38 Y0 Z0                                   ; set tool 1 axis offsets
      G10 P1 R0 S0                                       ; set initial tool 1 active and standby temperatures to 0C
      
      ; Custom settings are not defined
      
      M591 D0 P2 C"e0stop" S1							   ; Final de Filamento extrusor 0
      M591 D0 P2 C"e1stop" S1							   ; Final de Filamento extrusor 1
      
      ; Miscellaneous
      M501                                               ; load saved parameters from non-volatile memory
      M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
      T0                                                 ; select first tool
      G10 P1 R0 S0                                     ; set initial tool 1 active and standby temperatures to 0C
      
      ; Custom settings are not defined
      
      

      I include a photo of the provisional connection to verify that the pins are correct, I think so.

      IMG_20230519_143838.jpg

      Below I indicate the answers obtained by the program:
      Sin título.png.

      On the other hand, to try to identify the error I have measured the voltage between VSSA and the different THERMISTORS and it does not give a constant value of 3.3V. the voltage fluctuates between 0.5V and 3.3V more or less. I don't know if this is normal.

      I appreciate your interest.

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @Juan Estanislao
        last edited by

        @Juan-Estanislao the voltage between ADVREF and VSSA should always be close to 3.3V, and the voltge between VSSA and GND should always be a small fraction of a volt, provided that the thermistors are not shorted to anything.

        You do need to connect a 2K2 or 4K7 resistor between the thermistor input and ADVREF. Without that resistor, you will most likely get slowly changing random readings if no thermistor or PT1000 is connected (similar to what you observed); or a short-circuit error if one is 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

        Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
        • Juan Estanislaoundefined
          Juan Estanislao @dc42
          last edited by

          Hi @dc42

          The voltages between ADVREF and VSSA are very close to 3.3V and the voltage between VSSA and GND is a small fraction of a volt as you say.
          As seen in the photo, I have connected a 4K7 resistor between the thermistor input and ADVREF, but the problem is not solved.
          Is it normal that without having anything connected to these pins, the voltmeter measures a voltage between the VSSA pin and THERMISTOR4 that fluctuates between 0.5V and 3.3V more or less?

          dc42undefined 1 Reply Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @Juan Estanislao
            last edited by

            @Juan-Estanislao said in Problem with the chamber's PT1000 thermistor:

            Is it normal that without having anything connected to these pins, the voltmeter measures a voltage between the VSSA pin and THERMISTOR4 that fluctuates between 0.5V and 3.3V more or less?

            No, that's not normal. If nothing is connected to the Thermistor4 pin then a voltmeter connected between that pin and either VSSA or ground would normally read zero. If the voltmeter had an extremely high input resistance, or if there was condensation on the board, then it might read higher.

            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

            Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
            • Juan Estanislaoundefined
              Juan Estanislao @dc42
              last edited by

              We can then conclude that the duet2wifi is broken.

              What a pity.

              Thank you very much for clarifying my doubts.

              dc42undefined 1 Reply Last reply Reply Quote 0
              • dc42undefined
                dc42 administrators @Juan Estanislao
                last edited by

                @Juan-Estanislao if the reading varies a lot regardless of whether the thermistor and/or 4K7 resistor are connected, then I think the most likely explanation is that the thermistor4 pin on the expansion connector is open circuit, or the 10K series resistor connected to that pin is not properly soldered. Have you tried using a different thermistor input on 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

                Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
                • Juan Estanislaoundefined
                  Juan Estanislao @dc42
                  last edited by

                  @dc42 I have tried all the THERMISTERS of the expansion pins and they all give a reading that fluctuates a lot.
                  I will measure the resistors on the board and check if they are well soldered.

                  Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
                  • Juan Estanislaoundefined
                    Juan Estanislao @Juan Estanislao
                    last edited by

                    I have checked the resistances of the THERMISTORS and they all give a value of 10K.
                    On the other hand, I have made a measurement of the voltage between the two cables of the PT1000 being connected to the 4K7 resistor between the thermistor input and ADVREF, and it gives a value of 0.68V at room temperature. The exact same value that it gives when connected to BEDTEMP, E1TEMP, and E0TEMP, which I deduce is something either from the chip or from the program.
                    I don't know if you can see the error in the program.

                    Juan Estanislaoundefined dc42undefined 2 Replies Last reply Reply Quote 0
                    • Juan Estanislaoundefined
                      Juan Estanislao @Juan Estanislao
                      last edited by

                      I've been trying different things all week but it still doesn't work.
                      Could you please confirm that the configuration is correct and that the connection with the 4K7 resistor is correct?
                      If so, I'll buy another duet, if it's a problem with the duet.
                      Thank you so much.

                      1 Reply Last reply Reply Quote 0
                      • dc42undefined
                        dc42 administrators @Juan Estanislao
                        last edited by

                        @Juan-Estanislao said in Problem with the chamber's PT1000 thermistor:

                        I have checked the resistances of the THERMISTORS and they all give a value of 10K.

                        In that case they are not PT1000 sensors. They could be PT10000 sensors, although I have never heard of such a sensor. Most likely they are 10K thermistors. If so then you should configure them like this:

                        M308 S3 P"e3temp" Y"thermistor" R4700 T10000

                        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

                        droftartsundefined 1 Reply Last reply Reply Quote 0
                        • droftartsundefined
                          droftarts administrators @dc42
                          last edited by

                          @dc42 I took that as meaning he had checked the 10K series resistors that connect to each thermistor pin, ie R6 to R9 below:
                          4889b168-00b4-4394-ac20-da49fb566f50-image.png

                          Ian

                          Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                          Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
                          • Juan Estanislaoundefined
                            Juan Estanislao @droftarts
                            last edited by

                            @droftarts said in Problem with the chamber's PT1000 thermistor:

                            I took that as meaning he had checked the 10K series resistors that connect to each thermistor pin, ie R6 to R9 below

                            That's what I mean. That these resistors are correct and are well soldered.

                            As explained in the photo that I sent of the connection, I connected the 4K7 resistor between ADVREF and THERMISTOR3,4,5... I did the same configuration that you indicate in the image.
                            I measured the voltage of the PT1000 at room temperature and it gave 0.68V in a stable way. The same value it gives if I connect the same PT1000 to BEDTEMP, E1TEMP, and E0TEMP. From this I deduce that the connections are well made. For some reason the chip doesn't read the voltage.

                            If the configuration is correct, it is the only reason why it can fail.

                            droftartsundefined 1 Reply Last reply Reply Quote 0
                            • droftartsundefined
                              droftarts administrators @Juan Estanislao
                              last edited by

                              @Juan-Estanislao Are you sure your resistor is 4K7 ohm? It should be Yellow, Violet, Black, Brown and Green. Slightly hard to see in your picture, but yours looks more like Yellow, Blue, Blue, Violet, Violet? That would be 4.66G ohms! If it's Yellow, Blue, Blue, Brown, Brown, that would be 4K66, which would be close enough.

                              Otherwise, I'd suspect a bad joint in your wiring, probably the thermistor and/or resistor is not making contact with one of the pins. You can check for continuity by using the pin of the connector on the back of the board.

                              Ian

                              Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                              Juan Estanislaoundefined 1 Reply Last reply Reply Quote 0
                              • Juan Estanislaoundefined
                                Juan Estanislao @droftarts
                                last edited by

                                @droftarts The colors of my resistor are yellow, violet, black, brown and brown, because it has a tolerance of 1%. It's 4K7.
                                The connections are correct. I have measured continuity. And as I said before the voltage between the ends of PT1000 are the same as in BEDTEMP, E1TEMP, and E0TEMP

                                1 Reply Last reply Reply Quote 0
                                • dc42undefined
                                  dc42 administrators @Juan Estanislao
                                  last edited by dc42

                                  @Juan-Estanislao said in Problem with the chamber's PT1000 thermistor:

                                  M308 S3 P"e3temp" Y"pt1000" R4700

                                  The Thermistor3 pin on the expansion connector is not pin "e3temp", it's pin "e2temp". This is because thermistor0 in the Duet 2 is "bedtemp", thermistor 1 is "e0temp", and so on.

                                  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

                                  droftartsundefined Juan Estanislaoundefined 2 Replies Last reply Reply Quote 1
                                  • droftartsundefined
                                    droftarts administrators @dc42
                                    last edited by

                                    @dc42 Doh! I can't believe I missed that!

                                    Ian

                                    Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                                    1 Reply Last reply Reply Quote 0
                                    • Juan Estanislaoundefined
                                      Juan Estanislao @dc42
                                      last edited by

                                      @dc42 That was the problem. I have already changed the pin and it seems that everything is fine and that the measurements are correct.
                                      Thank you very much for your help.😊

                                      1 Reply Last reply Reply Quote 0
                                      • dc42undefined dc42 marked this topic as a question
                                      • dc42undefined dc42 has marked this topic as solved
                                      • First post
                                        Last post
                                      Unless otherwise noted, all forum content is licensed under CC-BY-SA