Heater 0 and Heater 1 reading 2000°C



  • I have a Delta with two Smart effectors. After changing my effector BOTH, bed and hotend started reading 2000°C. I did not change any wireing or configuration. If it only was the hotend, it culd be a broken wire, but the fact that tne bed ALSO reads 2000°C makes me suspicious... I also tried connecting the hotend thermistor to the second channel, same here.

    Did my duet just break?



  • Funny, I have excactly the same Problem. It is a brand new duet WiFi 2 with external antenna. Everything works perfekt but not the temp reading. It also Shows 2000 on both channels. Here is my config:

    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; 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 S120 ; set temperature limit for heater 0 to 120C
    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" T100000 B4138 ; 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 S280 ; set temperature limit for heater 1 to 280C

    Hopefully Dave could give us more informations.



  • @Bakak -273 would indicate a broken wire (open). 2000C indicates a short.

    Debugging step: Plug and unplug the sensor wires. It is OK to do this while powered up. (NEVER plug a motor while powered up). Watch for changes on the web console and report back.

    Debugging step: Measure the resistance of each sensor Using a DVM or similar

    Report that all back here.



  • @CaiJonas said in Heater 0 and Heater 1 reading 2000°C:

    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp

    My "standard off the shelf" thermistors that come with E3D V6 hotends are configured like this:

    M308 S1 P"1.temp0" Y"thermistor" T100000 B3950 A"HE1"

    That beta value in your config, B4138, where did that originate? And where did the thermistor itself, the physical device, where did it originate?



  • Hi @Danal

    I wrote this config a while ago, can't rember where I got the infos from but it works with other duet wifis. I tried your and the following config without any succes:
    M308 S1 P"e0_temp" Y"thermistor" T100000 B4725 C7.06e-8 ; define E0 temperature sensor
    M950 H1 C"e0_heat" T1 ; heater 1 uses the e0_heat pin and sensor 1
    I tried two different e3d thermistors on e0, e1 and bed connectors for the heatsensor. No succes
    I measured the resistant, thermistors and wiring is fine.

    I think my WiFi board is falty, temp always 2000°C. Never had this proble, before and i build up 6 3D Printer, all with duet boards


  • Moderator

    @CaiJonas What firmware? Commands are formatted for RepRapFirmware 3. Send M115 to the Duet, post the response. New Duets do not come with RRF3, usually 2.03.

    @Bakak What firmware? Send M115 to the Duet, post the response. Post your config.g too.

    Ian



  • @CaiJonas said in Heater 0 and Heater 1 reading 2000°C:

    I think my WiFi board is falty, temp always 2000°C.

    Unplug that temp sensor completely. Still read 2000?



  • Danal said in Heater 0 and Heater 1 reading 2000°C:

    Debugging step: Measure the resistance of each sensor Using a DVM or similar

    Indeed! If they measure about 100kΩ at 20°C they should be ok and then carefully without shorting any pins measure from ground on say the Vin terminal to both pins of the thermistor input and report back readings.



  • FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.03 ELECTRONICS: Duet WiFi 1.0 or 1.01 FIRMWARE_DATE: 2019-06-13b2
    
    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.0.4 on Sat Oct 12 2019 17:04:55 GMT+0200 (Mitteleuropäische Sommerzeit)
    
    ; General preferences
    G90                                         ; send absolute coordinates...
    M83                                         ; ...but relative extruder moves
    M550 P"Predator"                            ; set printer name
    M665 R220 L440.4 B185 H420.607                  ; Set delta radius, diagonal rod length, printable radius and homed height
    M666 X0 Y0 Z0                               ; put your endstop adjustments here, or let auto calibration find them
    
    ; Network
    M552 S1                                     ; enable network
    M586 P0 S1                                  ; enable HTTP
    M586 P1 S0                                  ; disable FTP
    M586 P2 S0                                  ; disable Telnet
    M575 P1 B57600 S1				;Serial Port for Panel Due
    
    ; Drives
    M569 P0 S0                                  ; physical drive 0 goes forwards
    M569 P1 S0                                  ; physical drive 1 goes forwards
    M569 P2 S0                                  ; physical drive 2 goes forwards
    M569 P3 S1                                  ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3                            ; set drive mapping
    M350 X16 Y16 Z16 I1
    M350 E16 I1                     ; configure microstepping with interpolation
    M92 X160.00 Y160.00 Z160.00 E412;  E399	    ; set steps per mm
    M566 X600.00 Y600.00 Z600.00 E160.00  ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z18000.00 E10000.00 ; set maximum speeds (mm/min)
    M201 X2000.00 Y2000.00 Z2000.00 E1000.00    ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800 I50             ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                     ; Set idle timeout
    
    ; Axis Limits
    M208 Z0 S1                                  ; set minimum Z
    
    ; Endstops
    M574 X2 Y2 Z2 S1                            ; set active low and disabled endstops
    
    ; Z-Probe
    M558 P5 R0.4 H20 F1200 T6000 A10 S0.02                 ; set Z probe type to effector and the dive height + speeds
    G31 P100 X0 Y0 Z-0.13                           ; set Z probe trigger value, offset and trigger height
    M557 R180 S18                               ; define mesh grid
    
    
    ; Heaters
    M305 P0 T100000 B4138 C0 R4700                 ; set thermistor + ADC parameters for heater 0
    M143 H0 S120                                ; set temperature limit for heater 0 to 120C
    M305 P1 B4725 C7.060000e-8 R4700                ; set thermistor + ADC parameters for heater 1
    M143 H1 S280   
    ;M305 P2 B4725 C7.060000e-8 R4700                ; set thermistor + ADC parameters for heater 1
    ;M143 H2 S280                                ; set temperature limit for heater 1 to 280C
    
    ; Fans
    
    
    M106 P0 S0 F100  C"Bauteillüfter"                    ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S0.66 H1 F100 T60 L0.3 X0.75              ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    
    ; Tools
    M563 P0 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
    
    ; Custom settings are not defined
    M98 P0:/sys/retract.g
    T0
    M501
    M572 D0 S0
    G29 S1
    
    

    I'm measuring 120k for the hotend Thermistor and 114k for the Bed thermistor, which should be fine....

    I mesaure a Voltage of 3.2V from Thermistor0-pin, Thermistor1-pin and Thermistor2-pin to GND. ---However, the VSSA voltage is slowly crawling from 3.2V to 0V while i measure between VSSA and GND. shouldnt VSSA be GND potential?

    edit: i just noticed... there is a resettable fuse F1... how do i reset it?


  • administrators

    @Bakak said in Heater 0 and Heater 1 reading 2000°C:

    I mesaure a Voltage of 3.2V from Thermistor0-pin, Thermistor1-pin and Thermistor2-pin to GND. ---However, the VSSA voltage is slowly crawling from 3.2V to 0V while i measure between VSSA and GND. shouldnt VSSA be GND potential?

    Yes, VSSA should be only a few millivolts above ground unless there is a short circuit between VSSA and a higher voltage. The polyfuse connects VSSA to GND. It is self-resetting.



  • @Bakak said in Heater 0 and Heater 1 reading 2000°C:

    there is a resettable fuse F1... how do i reset it?

    it should as dc42 said self reset; to test it power off the board and measure resistance F1 it, should probably be in the 0-1 ohm range if working.



  • Overload... i guess it broke -.-



  • What type of fuse is this?
    I'm confident, that i can replace it



  • @Bakak said in Heater 0 and Heater 1 reading 2000°C:

    Overload... i guess it broke -.-

    may sound silly but double check you have a 0 reading when shorting the leads, and make sure to apply some pressure to pierce any oxide layer on the solder joint.

    @Bakak said in Heater 0 and Heater 1 reading 2000°C:

    What type of fuse is this?
    I'm confident, that i can replace it

    shematic says:

    Fuse to protect the SAM from VIN applied to VSSA in error.
    Multicomp MC36207, Bel Fuse 0ZCJ0020FF2E



  • yep. just measured again in high ohm range, 15M.

    thanks for your help, this saves me a ton of money 😉



  • @droftarts I'm using the latest release of ReprapFirmware 3, upgrading was the first thing I did. All other things works just perfekt.

    @Danal with unplugged sensor it also shows 2000

    @dc42 what could I do to test, what is the problem?

    Thanks to all so far


  • administrators

    Bourns MF-MSMF014 is another suitable part number for the VSSA fuse. You can solder the new fuse on top of the old one, which will be easier than trying to remove the old one.

    I've never heard of the VSSA polyfuse failing before.

    As a temporary workaround, you could connect VSSA on one of the thermistor connectors to GND on one of the endstop connectors. But then you lose the protection against a thermistor short to VIN, which is what the fuse is there to protect against.



  • haha! finally i'm the first to achieve something 😜

    I just ordered some of the fuses. don't want to run the board unprotected



  • You don't need a poly fuse or even a surface mount one, any odd fast acting 100mA or so fuse could be either wired between VSSA and GND or solderd in parallell with the existing one would provide protection.



  • @Bakak @dc42 I don't get it, what fuse can I measure and what should the value be?


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