PWM Fans not responding to GCodes



  • Hi All
    Once again, there is another person struggling to configure their Print Cooling Nozzle Fan. I have read all of the other posts regarding this issue but still have not succeeded. I have my nozzle fan connected to Fan0 on my Duet 2 Wifi (2.02 Firmware) and Heatsink fan on Fan1.
    So far, I have tried adjusting the blip time, changing the frequency, tried different Fan connections, re configuring tool settings and just about everything else.
    I understand that Fan0 is set for PWM on the nozzle fan by default and tried to run the fan with no config settings for it, but I figure it wouldn't hurt to put it back in (whether its a good idea or not).

    My Config.g is below:

    *; Fans
    M106 P0 S1 I0 F500 H-1 B1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H4 T30:55 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P6 S1 F500 ; configure fan 6 as always on
    M106 P7 S1 F500 ; configure fan 7 as always on

    ; Tools
    M563 P0 S"Nozzle 1" D0 H1 ; 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*

    Thank you all for the help.



  • Does the fan itself work if plugged into the always on fan header?

    Have you tried without the I0? Or with I1?



  • Hi Pheadrux
    Yes, it does work from the always on fans and I have tried to adjust the Signal Inversion.
    I am starting to think that it is the fan that I am trying to use. It is a Cera Dyna ATX Radial fan.
    I will try come different fans and hopefully they will work.
    Thanks for the help!



  • @BenNorton01 said in PWM Fans not responding to GCodes:

    ; Tools
    M563 P0 S"Nozzle 1" D0 H1 ; Define tool 0

    Try this:

    ; Tools
    M563 P0 S"Nozzle 1" D0 H1 F0 ; Define tool 0

    I assume that your heat sink fan works fine?


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