Always On Fans and PWN Fans

aceycv8

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

baird1fa

@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.

aceycv8

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

Phaedrux

@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?