Always On Fans and PWN Fans



  • Hi guys

    I have an issue with my setup but dont know whats causing it.

    I have wired up some stepper cooler fans to the Always On port of my board, however since doing this when i turn on my machine my heatsink fan now starts up ( ignores the 45deg temp setting to turn on ) and my parts cooling fan turns on slowly as well.
    if i disconnect the always on fan everything operates as normal but plug the fans back in they all spin on startup

    do i need to enter something into my config to stop this from happening?
    i current have this set in my config.

    ; Fans
    M106 P1 S0.7 I0 F500 H1 T45                           ; Set Heatsink fan Port 1, PWM signal inversion and frequency. Thermostatic control is turned on
    
    ; Tools
    M563 P0 D0 H1                                       ; Define tool 0
    G10 P0 X35 Y0 Z0                                     ; Set tool 0 axis offsets
    G10 P0 R0 S0                                        ; Set initial tool 0 active and standby temperatures to 0C
    M563 P1 D1 H2                                       ; Define tool 1
    G10 P1 X15 Y0 Z0                                    ; Set tool 1 axis offsets
    G10 P1 R0 S0                                        ; Set initial tool 1 active and standby temperatures to 0C
    
    ; Miscellaneous
    T0                                                  ; Select first tool
    

    Thank you



  • @aceycv8
    Are you using 12V fans running off the onboard buck converter? It sounds like you might just be drawing too much current and causing a voltage drop.



  • @baird1fa no all my fans are 24v - no converters in place


  • Moderator

    @aceycv8 said in Always On Fans and PWN Fans:

    if i disconnect the always on fan everything operates as normal but plug the fans back in they all spin on startup

    Sounds like a wiring problem. Can you show how they are wired?


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