Tool board pwm header



  • I was looking at replacing my regular heat sink fan with a pwm model. I looked up the wiring from noctua and they list the pwm signal at 5v. The tool board wiring diagram lists the pwm as 12v. I assume I won't be able to use a 4 wire fan, but instead will have to use a regular 3 pin or just use 2 pins for power it?


  • administrators

    The PWM signal is an open drain output as specified in the Intel specification. It works with Noctua fans and other brands.



  • @dc42 Cheers



  • @dc42 Can you not use 2 tacho signals at the same time?

    ; Fans
    M950 F0 C"121.out2+out2.tach" 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"121.out1+out1.tach" Q500 ; create fan 1 on pin out4 and set its frequency
    M106 P1 S1 H1 T50 ; set fan 1 value. Thermostatic control is turned on

    alt text



  • I got it working after a reboot. But now I have another problem.

    My hotend fan is running even though it is supposed to be under thermostatic control.

    alt text

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun Apr 05 2020 04:11:56 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                          ; send absolute coordinates...
    M83                                          ; ...but relative extruder moves
    M550 P"FT-6"                               ; set printer name
    
    ; Drives
    M569 P0.0 S1                                 ; 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 P121.0 S0                                 ; physical drive 0.3 goes forwards
    M584 X0.0 Y0.1 Z0.2 E121.0                     ; set drive mapping
    M350 X256 Y256 Z16 E16 I1                      ; configure microstepping with interpolation
    M92 X1280.00 Y1280.00 Z720.00 E409.00           ; set steps per mm
    M566 X900.00 Y900.00 Z6.00 E120.00          ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z150.00 E1200.00      ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z10.00 E250.00          ; set accelerations (mm/s^2)
    M906 X1200 Y800 Z1500 E750 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 X690 Y330 Z400 S0                       ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"!io0.in"                         ; configure active-low endstop for low end on X via pin io0.in
    M574 Y1 S1 P"!io1.in"                         ; configure active-low endstop for low end on Y via pin io1.in
    ;M574 Z1 S1 P"^io2.in"                         ; configure active-low endstop for low end on Z via pin io2.in
    
    ; Z-Probe
    M558 P8 C"121.io1.in" H5 F120 T6000               ; disable Z probe but set dive height, probe speed and travel speed
    M557 X15:650 Y15:300 S100                     ; define mesh grid
    
    ; Heaters
    M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; 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
    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"121.temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
    M950 H1 C"121.out0" T1                           ; create nozzle heater output on out1 and map it to sensor 1
    M143 H1 S280                                 ; set temperature limit for heater 1 to 280C
    M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"121.out2+out2.tach" 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"121.out1+out1.tach" Q500                         ; create fan 1 on pin out4 and set its frequency
    M106 P1 S1 H1 T50                            ; 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
    G31 P500 X-23.5 Y-24.5 Z1.85                          ; Probe offsets
    
    ; Custom settings are not defined
    
    ; Miscellaneous
    M501                                         ; load saved parameters from non-volatile memory
    
    
    

    When the hotend reaches 50 degrees the fan actually turns off


  • administrators

    Is it a 4 wire fan? If so then you need to invert the main pin in the M950 F command.


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