E0 Thermistor faults



  • Duet Web Control 2.0.4
    Board: Duet Maestro 1.0
    Firmware: RepRapFirmware for Duet 2 Maestro 3.0 (2020-01-03b3)

    Thermistor for E0 constantly shows -231. Bed thermistor is ok. I've tried two different thermistors in the e0 slot and neither work even in open air. As a final test I used my known good bed thermistor (still hooked to the bed header) and it still shows bad. The next power on after I put that back shows it giving good measurements agani. This clearly shows it isn't the devices. Here is the G code for those two devices.

    The e0 thermistor and spare were stock Ender 3 Pro. The bed heater is a NTC 3950 100K Thermistor.

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4092     ; 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
    M143 H0 S150                                       ; set temperature limit for heater 0 to 150C
    M307 H0 B1 S1.00                                   ; enable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M308 S1 P"e0temp" Y"thermistor" T9880 B4185        ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M143 H1 S275                                       ; set temperature limit for heater 1 to 275C
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    

    Where do I go next. I specifically paid more this time around for a non-Chinese POS so I didn't have to deal with headers backward and pins mislabeled.



  • -231 indicates an "open" circuit, nothing plugged in.

    Please post your complete config.g, and a photo of where that sensor is plugged into the board.



  • @LostJen said in E0 Thermistor faults:

    T9880

    Never seen such a low value...could be T100000 but depends on the thermistor



  • @DIY-O-Sphere said in E0 Thermistor faults:

    @LostJen said in E0 Thermistor faults:

    T9880

    Never seen such a low value...could be T100000 but depends on the thermistor

    It was autogenerated for the Ender 3 Pro. However looking at the github version (2.x firmware) it appears there is a 1 missing from the end. Perhaps a minor typo in the config file generator for V3 firmware?



  • @Danal said in E0 Thermistor faults:

    -231 indicates an "open" circuit, nothing plugged in.

    Please post your complete config.g, and a photo of where that sensor is plugged into the board.

    I'm not sure you really should be asking people for complete config.g files. The password is stored plain text. It'd be stupid to expose a printer to the internet, but still that data should prolly be kept private.

    zoomed-official wiring guide.jpg
    The wiring diagram is actually off here as is shown in this zoomed pictures. The cluster of E0, E1, and Enclosure are not beside the stops, but rather behind the zstop.
    IMG_0806.jpg
    E0 Thermistor highlighted in green and yellow. Right now it is in the open air just to rule out a short with the microswiss.

    This is still mostly the autogenerated file and I expect most of it will need tweaking. But I haven't been able to heat the hotend enough to do the final tighter on my new all metal head, so I was focusing on heat first.

    ; Configuration file for Duet Maestro (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Mon Mar 30 2020 11:15:43 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Ender 3 Pro - Duet Maestro"                 ; set printer name
    
    ; Network
    M551 P"12345678"                               ; this isn't my password for the duet, it the password for my luggage
    M552 P0.0.0.0 S1                                   ; enable network and acquire dynamic address via DHCP
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S0                                         ; disable FTP
    M586 P2 S0                                         ; disable Telnet
    
    ; Drives
    M569 P0 S0                                         ; physical drive 0 goes backwards
    M569 P1 S0                                         ; physical drive 1 goes backwards
    M569 P2 S1                                         ; physical drive 2 goes forwards
    M569 P3 S0                                         ; physical drive 3 goes backwards
    M584 X0 Y1 Z2 E3                                   ; set drive mapping
    M350 X16 Y16 Z16 E128 I1                           ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E741.00                  ; set steps per mm
    M566 X600.00 Y600.00 Z60.00 E300.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X9000.00 Y9000.00 Z180.00 E6000.00            ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z120.00 E5000.00              ; set accelerations (mm/s^2)
    M906 X800 Y800 Z800 E900 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 X235 Y235 Z260 S0                             ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
    M574 Y1 S1 P"ystop"                                ; configure active-high endstop for low end on Y via pin ystop
    M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z
    
    ; Z-Probe
    M950 S0 C"zprobe.mod"                             ; create servo pin 0 for BLTouch
    M558 P9 C"zprobe.in" H5 F120 T6000                 ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X0 Y0 Z2.5                                ; set Z probe trigger value, offset and trigger height
    M557 X10:220 Y10:220 S20                           ; define mesh grid
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4092     ; 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
    M143 H0 S150                                       ; set temperature limit for heater 0 to 150C
    M307 H0 B1 S1.00                                   ; enable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M308 S1 P"e0temp" Y"thermistor" T9880 B4185        ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M143 H1 S275                                       ; set temperature limit for heater 1 to 275C
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"fan0" Q20                                ; 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"fan1" Q20                                ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45                                  ; set fan 1 value. Thermostatic control is turned on
    
    ; Tools
    M563 P0 S"HotEnd" D0 H1 F0                         ; 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
    
    ; Miscellaneous
    M501                                               ; load saved parameters from non-volatile memory
    M911 S21 R23 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
    

    EDIT: It works now. The autogen wizard has a typo that left off the 1 from 98801. That most likely is the issue, but it is unlikely but also possible that I had an unfortunately tremor/twitch in that field (<sarcasm>I just love my meds, side effects and all</sarcasm>).

    EDIT to EDIT: Oh, yeah. Thanks everyone - especially for calling out that low number that made me check the git hub ender 3 pro baseline.


  • Moderator

    @LostJen said in E0 Thermistor faults:

    It was autogenerated for the Ender 3 Pro. However looking at the github version (2.x firmware) it appears there is a 1 missing from the end. Perhaps a minor typo in the config file generator for V3 firmware?

    Where are you seeing this? Because this is the configuration for the Ender 3 Pro for the RRF config tool: https://raw.githubusercontent.com/chrishamm/configtool/master/public/machines/ender3pro.json
    It sets both thermistors to "thermistor":100000,"beta":4092
    It uses the same template for RRF2 and RRF3.

    Ian



  • @droftarts said in E0 Thermistor faults:

    Where are you seeing this? Because this is the configuration for the Ender 3 Pro for the RRF config tool: https://raw.githubusercontent.com/chrishamm/configtool/master/public/machines/ender3pro.json
    It sets both thermistors to "thermistor":100000,"beta":4092
    It uses the same template for RRF2 and RRF3.

    Ian

    You are right I zipped through it just now. Sorry.

    I found the source of the other number and what happened. I didn't use the defaults because the guide I was using said not to. I used my value of 10k for the bed heater's thermistor because it's aftermarket (GCR silicone with a new aluminum plate for better levelness [Part of why I liked the idea of using a Duet product - higher heated bed current support]), but according to the Dozuki site

    Set the values for both Thermistor values as: R25 – 98801, B – 4185, R – 2200
    

    Unfortunately for me I must have missed the 1 or typed a ` insead. That 98801 does match the github for Ender 3 Pro. So I have different value than template because I used guide and it didn't work because I mistyped. So yes, this was doubly my mistake. I make typos like that entirely too often, but usually autocorrect, triple checking posts, or something catches them for me.

    Sorry again, and thank you to everyone for helping me find the issue regardless of where it came from.


  • Moderator

    @LostJen No need to apologise! Easy mistake to make. Just needed to work out if there was anything needing changing our end.

    Ian


Log in to reply