PT100 and daughter board issue

  • Hello guys, after some prints, the PT100 didn't want to work anymore.
    below are the tests I performed:

    • changed the PT100, nothing changed

    • tried all the 8 ports with a 100ohm resistance in order to understand if the daughterboard works but the value is always 2000.

    I bought the daughter board some weeks ago.
    How can I understand if the board works?
    thank you.

  • @Ducati87 It was working, and it does not work now? Ot it was not working at all ?

  • it worked like a charm. After some prints it doesn't work anymore without a reason...Now I have replaced the PT100 with a normal thermistore.

  • administrators

    1. Connect the 100R resistor to one of the inputs, also make sure that you have the 2 jumpers for that input fitted.

    2. If it reads 2000C, send M305 H# (if using RRF2) or M308 S# (if using RRF3) to get the error reason for that sensor, where # is the heater number (RRF2) or sensor number (RRF3).

    3. Post your config.g file and tell us what firmware version you are using.

  • config.g:

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool v3.1.8 on Fri Nov 20 2020 20:14:09 GMT+0100 (Ora standard dell’Europa centrale)
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Hypercube Evolution"                        ; set printer name
    M669 K1                                            ; select CoreXY mode
    ; 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 S0                                         ; physical drive 4 goes forwards
    M584 X0 Y1 Z2:4 E3                                 ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X161.12 Y160.37 Z393.18:393.18 E830.00         ; set steps per mm
    M566 X1000.00 Y1000.00 Z15.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z600.00 E1800.00            ; set maximum speeds (mm/min)
    M201 X1800.00 Y1800.00 Z30.00 E300.00              ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1500:Z1500 E1000 I30                    ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                            ; Set idle timeout
    ; Axis Limits
    M208 X0 Y0 Z0 S1                                   ; set axis minima
    M208 X0:300 Y-45:300 Z285 S0                     ; set axis maxima
    ; Endstops
    M574 X1 S3                                         ; configure sensorless endstop for low end on X
    M574 Y1 S3                                         ; configure sensorless endstop for low end on Y
    M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z
    ; Z-Probe
    M950 S0 C"exp.heater3"                             ; create servo pin 0 for BLTouch
    M558 P9 C"^" H3 F420 T9000                ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X22 Y-37 Z2.520                             ; set Z probe trigger value, offset and trigger height
    M557 X0:250 Y25:230 S40:40                         ; define mesh grid
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B3950     ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat and map it to sensor 0
    M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
    ;M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M308 S1 P"spi.cs2" Y"rtd-max31865"                 ; configure sensor 1 as thermocouple via CS pin spi.cs2
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    M143 H1 S290                                       ; set temperature limit for heater 1 to 290C
    ; Fans
    M950 F0 C"Mat Fan1" Q500                           ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"Hotend Fan" Q500                           ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45                              ; set fan 1 value. Thermostatic control is turned on
    M950 F2 C"Mat Fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
    M106 P2 S1 H-1                                 ; set fan 2 value. Thermostatic control is turned off
    ; Tools
    M563 P0 S"hotend 0" D0 H1 F0:2                     ; 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
    ; Custom settings
    M404 N1.75 D0.4								        ; Nozzle and filament diameter for monitor
    M200 D1.75 									        ; set all extruder filament diameters to 1.75mm
    M671 X40:280 Y145:145 S10							; Define positions of Z leadscrews or bed levelling screws
    M376 H10											; Set bed compensation taper
    ; Miscellaneous
    M575 P1 S1 B57600                                  ; enable support for PanelDue
    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

    M308 S1:

    M308 S1
    Sensor 1 type PT100 (MAX31865) using pin spi.cs2, reading -1.3, last error: success, 2/4 wires, reject 50Hz, reference resistor 400 ohms


    Board: Duet 2 WiFi (2WiFi)
    Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.1.1 (2020-05-19b2)
    Duet WiFi Server Version: 1.23

  • I would say pt100 board looks OK, and pt100 sensor itself is faulty (as connected 100R resistor gives You around 0*C reading).

  • yes now seems to work....I don't know why! Anyway thank you for your support guys!

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