Torque vs. Current on Firmware 3.11



  • Hi,

    my Duet Wifi with Duex5 extension board should drive 4 extruder.

    When I used only one Extruder the M906 command was
    M906 X900 Y900 Z900 E900 I30

    As soon as I added another Extruder with 900mA the Extruder0 looses torque.
    With 4 Extruders working on 900mA, I even have no torque on any of the extruders.

    Therefore I changed the current to nearly three times the original value,
    but beeing still below 2.8 A.

    Now my M906 command is :
    M906 X900 Y900 Z900 E2500:2500:2500:2500 I50

    Is this correct to do so, or do I miss something?

    Thanks for your replies.



  • Sorry being unprecise: DUET 2 WIFI with DUEX5 extension board.


  • Moderator

    @Audi2502 Please post your full config.g, or at least the full motor settings part, including M584 setting. Please also send M115 and post response, to check firmware version is really 3.1.1.

    Ian



  • Hi drofarts,

    here is config.g.

    I skipped only the

    G90                                                    ; send absolute coordinates...
    M83                                                    ; ...but relative extruder moves
    M550 P"Davinci"                                        ; set printer name
    M669 K1 X-1:-1:0 Y1:-1:0 ; CoreXY System
    
    ; Network
    M552 S1                                                ; enable network
    M586 P0 S1                                             ; enable HTTP
    M586 P1 S1                                             ; enable FTP
    M586 P2 S1                                             ; enable 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 S0 ;Heater 3                                             ; physical drive 3 goes forwards
    M569 P4 S0  ;Heater 4                                           ; physical drive 4 goes forwards
    M569 P5 S0	;Heater 1										   ; physical drive 5 goes forward
    M569 P6 S0	;Heater 2										   ; physical drive 6 goes forward
    
    M584 X0 Y1 Z2 E3:6:5:4                                     ; set drive mapping
    M350 X16 Y16 Z16 E16:16:16:16 I1                             ; configure microstepping with interpolation
    M92 X156.4 Y156.4 Z2540 E873.08:873.08:873.08:873.08         ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00:120.00:120.00:120.00             ; set maximum instantaneous speed changes (mm/min) = 15 mm/s
    M203 X6000.00 Y6000.00 Z180.00 E3000.00:3000.00:3000.00:3000.00        ; set maximum speeds (mm/min) 6000 mm/min = 100 mm/s
    M201 X3000.00 Y3000.00 Z20.00 E250.00:250.00:250.00:250.00             ; set accelerations (mm/s^2)
    M906 X900 Y900 Z900 E2500:2500:2500:2500 I50		                      ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                                ; Set idle timeout
    
    ; Axis Limits
    M208 X-6 Y-22 Z0 S1                                   ; set axis minima
    M208 X237 Y195 Z200 S0                                 ; set axis maxima
    
    ; Endstops
    M574 X2 S1 P"xstop"                                    ; configure active-high endstop for high end on X via pin xstop
    M574 Y1 S1 P"ystop"                                    ; configure active-high endstop for low end on Y via pin ystop
    
    ; Z-Probe
    M950 S0 C"duex.pwm5"                                 ; create servo pin 0 for BLTouch
    M558 P9 C"^zprobe.in" H10 F120 T6000         ; set Z probe type to bltouch and the dive height + speeds
    
    G31 P500 X-38 Y42 Z3                               ; set Z probe trigger value, offset and trigger height
    M557 X50:150 Y50:150 S20                               ; define mesh grid
    
    ; Bed Configuration 
    M308 S0 P"bedtemp" Y"pt1000" R4650					;PT1000 configuration directly on the Motherboard
    M950 H0 C"bed_heat" T0                                 ; create bed heater output on bedheat and map it to sensor 0
    M307 H0 A92.4 C667.4 D0.7 V11.4 B0					;enable PID mode for the bed heater 
    M140 H0                                                ; map heated bed to heater 0
    M143 H0 S120                                           ; set temperature limit for heater 0 to 120C
    
    
    ;Heater 1
    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; 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
    M307 H1 B0 S1.00                                        ; disable bang-bang mode for heater  and set PWM limit
    
    ;Heater 2
    M308 S2 P"e1temp" Y"thermistor"  T100000 B3950 C7.06e-8 ; configure sensor 2 as thermistor on pin e1temp
    M950 H2 C"e1heat" T2                                   ; create nozzle heater output on e1heat and map it to sensor 2
    M307 H2 A257.6 C184.2 D5.0 V12.0                       ; Set Heater2 from autotuning
    
    ;Heater 3
    M308 S3 P"duex.e2temp" Y"thermistor" T100000 B3950 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H3 C"duex.e2heat" T3                                   ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H3 A257.6 C184.2 D5.0 V12.0                                        ; disable bang-bang mode for heater  and set PWM limit
    
    ;Heater 4
    M308 S4 P"duex.e3temp" Y"thermistor" T100000 B3950 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
    M950 H4 C"duex.e3heat" T4                                   ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H4 A257.6 C184.2 D5.0 V12.0                                      ; disable bang-bang mode for heater  and set PWM limit
    
    
    
    ; Fans
    M950 F0 C"fan0" Q500                                   ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H1:4 T45 L1.0                    ; set fan 0 value. Thermostatic control is turned on // L is setting minimum Fan-Speed lets try
    M950 F1 C"fan1" Q500                                   ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S0 H2:3 T45 L1.0                                    ; set fan 1 value. Thermostatic control is turned on
    M950 F2 C"fan2" Q500                                   ; create fan 2 on pin fan1 and set its frequency
    M106 P2 S0 H-1                                         ; set fan 2 value. Thermostatic control is turned off
    M950 F3 C"duex.fan3" Q500                               ; create fan 3 on pin duex.fan3 and set its frequency
    M106 P3 S0 H-1                                          ; set fan 3 value. Thermostatic control is turned off
    
    
    ;GPIO PORTS
    M950 P6 C"duex.fan6" 
    M950 P7 C"duex.fan7"
    
    
    ; Tools
    M563 P0 S"Maker_2R" 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
    M591 D0 P1 C"e0_stop" S1								;Filament Sensor for Extruder Drive 0
    
    M563 P1 S"Maker_1L" D1 H2 F1                            ; define tool 1
    G10 P1 X-34 Y-19 Z0                                        ; set tool 1 axis offsets
    G10 P1 R0 S0                                           ; set initial tool 1 active and standby temperatures to 0C
    M591 D1 P1 C"e1_stop" S1							   ; Filament Sensor for Extruder Drive 1
    
    M563 P2 S"Maker_2L" D2 H3 F1 ;                           ; define tool 1
    G10 P2 X0 Y0 Z0                                        ; set tool 1 axis offsets
    G10 P2 R0 S0                                           ; set initial tool 1 active and standby temperatures to 0C
    
    M563 P3 S"Maker_1R" D3 H4 F0  ;                          ; define tool 1
    G10 P3 X0 Y0 Z0                                        ; set tool 1 axis offsets
    G10 P3 R0 S0                                           ; set initial tool 1 active and standby temperatures to 0C
    
    
    

    And this is the outcome of M115:

    1.7.2020, 11:16:28 	M115
    FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.1.1 ELECTRONICS: Duet WiFi 1.02 or later + DueX5 FIRMWARE_DATE: 2020-05-19b2
    


  • 2.5 amps on all your extruders? really?
    the firmware limit is 2.4 amps. If you really need that much you'll need active cooling on your board at a minimum.
    Do you have the model of the extruder stepper motors? Or a link to the datasheet?



  • @jay_s_uk said in Torque vs. Current on Firmware 3.11:

    If you really need that much you'll need active cooling on your board at a minimum.

    And probably the motors as well, at least if it's mounted to plastic parts



  • Hi jay_s_uk,

    this concerns me as well, therefore I am asking.

    As long as I use only one extruder 900 mA the torque of the Nema 17 with 44 N are fully enough.
    As soon as I add another in the configuration the torque drops and I have to increase the current.



  • @Audi2502 said in Torque vs. Current on Firmware 3.11:

    As soon as I add another in the configuration the torque drops and I have to increase the current.

    To the same driver?

    What happens to the Vin reading when the torque dropps?



  • Do you have some information about the installation?


  • Moderator

    @Audi2502 Are you losing torque during printing, or is this when testing and sending gcode commands directly (or using the DWC buttons to extrude)? If you're running a gcode file, check there are no extra M906 commands in it. You can also send M906 on it's own in the console to check the current current setting.

    Check your wiring of the Duex; there should be a thick, short ground cable between the negative terminals of the Duet and Duex; see https://duet3d.dozuki.com/Wiki/Duex2_and_Duex5_Features#Section_Wiring

    Do you still lose torque on the second extruder with the Duex disconnected?

    Ian



  • I found out during printing and then researched on this and other forums. Doubble checked nearly everything which came out out.

    When I push the DWC buttons or sending a gcode command it is the same behavior.
    I already checked the wiring and everything looks fine to me.

    I did not test with removed the Duex5, due to the fact that my bltouch is on the DUEX5.

    What I can tell is that when I only use the Duet2 Wifi extruder ports, it is the same behaviour.


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