Retrofitting Duet 3 6hc to Qidi Tech 1

Tyler

Hello all, as the topic says I am putting a Duet 3 6hc V1.02 into my old Qidi Tech 1 printer. I have everything good to go except the heated bed thermistor. I cannot for the life of me get it to register anything except -237.1c and "sensor open circuit" fault. I have hours in it and much googling to no avail. I could use any help possible. Thank you!

droftarts

@Tyler Please post your config.g, and send M115 in the console and post the output. Please show how you have wired the thermistor to the board, ie to which pin header. If you have a multimeter, check the resistance of the thermistor between its wires.

You can check the Duet is working correctly, by connecting a resistor of a known value to the temperature input pins. I use have made some plug in ones for diagnostics:
alt text

Ian

Tyler

@droftarts
My Config.g is as follows. I have been toying with the thermistor values based on anything I can find online because I have no actual information on it, with it being a Chinese clone. The bed has a pcb heater/thermistor and the pins are labeled (Sig, Gnd,Gnd,5v,+24v,Heat-) for six wires coming from it. I have the signal pin and the ground running to "temp0" pins on the Duet. I can see the traces for each GND combine immediately before going by a resistor labeled 4701. When I test the resistance I am getting .225 M Ohms. I currently do not have a temp sensor wired for the hot end because this printer came with thermocouples on the hotend and I have some new 100k thermistors coming in tomorrow to replace.

I am very new to messing with electronics like this so I thank you very much for your assistance.

; Configuration file for Duet 3 MB 6XD (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.16 on Mon Dec 04 2023 14:53:49 GMT-0500 (Eastern Standard Time)

; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"My Printer"                           ; set printer name

; Network
M552 P192.168.137.1 S1                       ; enable network and set IP address
M553 P255.255.255.0                          ; set netmask
M554 P192.168.1.254                          ; set gateway
M586 P0 S1                                   ; enable HTTP
M586 P1 S0                                   ; disable FTP
M586 P2 S0                                   ; disable Telnet

; Drives
M569 P0.0 S0                                 ; physical drive 0.0 goes forwards
M569 P0.1 S0                                 ; physical drive 0.1 goes forwards
M569 P0.2 S1                                 ; physical drive 0.2 goes forwards
M569 P0.3 S1                                 ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3                     ; set drive mapping
M92 X80.00 Y80.00 Z400.00 E420.00            ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00          ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00      ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00          ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I15                 ; set motor currents (mA) and motor idle factor in per cent
M84 S15                                      ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                             ; set axis minima
M208 X230 Y190 Z200 S0                       ; set axis maxima

; Endstops
M574 X2 S1 P"!io0.in"                         ; configure switch-type (e.g. microswitch) endstop for high end on X via pin io0.in
M574 Y2 S1 P"!io1.in"                         ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin io1.in
M574 Z1 S1 P"!io2.in"                         ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin io2.in

; Z-Probe
M558 P0 H5 F120 T6000                        ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:215 Y15:195 S20                     ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T10000 B3988 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                           ; create bed heater output on out0 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"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                           ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"out3" Q500                         ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out4" Q500                         ; create fan 1 on pin out4 and set its frequency
M106 P1 S1 H1 T45                            ; set fan 1 value. 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

The results of the M115 command are "FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.4.4+1 ELECTRONICS: Duet 3 MB6HC v1.02 or later FIRMWARE_DATE: 2022-11-15 17:36:33