Two controller fans with PWM
I want to use 2 x Arctic P12 Max as controller fans.
Fans are 4-pin, but I want to use only PWM (to slow them down) without tachometer signal.
One of the fans connected to FAN6 (vcc, gnd) and PD12 (pwm) and seems working with this config in overrides section:
It starts when I home and stays at 50% (idle_timeout does not work for some reason).
How to connect second fan?
29 Replies
then just do the same again, but with another name
[controller_fan controller_fan_2]
pin: !PD12
fan_speed: 0.5
idle_speed: 0.15
idle_timeout: 30
cycle_time: 0.01
and with the correct pin of coursegenerous-apricot•13mo ago
Yes, that the question, I could not figure out correct pins
consult your mainboard documentation
generous-apricot•13mo ago
PD15 / PD13 does not work
Octopus 1.1
Connecting a 4028 fan | RatOS
4028 server fans are becoming a popular option for part cooling because of their light weight and great pressure and flow rates. In this guide we'll go over how to connect one and use it for part cooling. 4-pin fans usually aren't used in 3d printers, and many boards only provide 2-pin ports, but fear not! There's always a way.
generous-apricot•13mo ago
Yes, part cooling 4028 connected like this to Fan7 / PD8
With this config
GitHub
BIGTREETECH-OCTOPUS-V1.0/BIGTREETECH Octopus - PIN.pdf at master · ...
This is Octopus open source material. Contribute to bigtreetech/BIGTREETECH-OCTOPUS-V1.0 development by creating an account on GitHub.
generous-apricot•13mo ago
I tried all of that, this is why I'm here
with this config second fan not spinning up
you need to use the enable pin feautre s described as in the ratos doc
https://os.ratrig.com/docs/guides/4028/#my-fan-runs-at-100-until-klipper-boots
generous-apricot•13mo ago
Okay...
If I just connect second fan to FAN5 - it is not reacting, so no 12V there?
Can figure out what I'm missing
please tell me exactly which cable of the fan is connected to which pin
generous-apricot•13mo ago
VCC and GND - to FAN5, PWM - PD13
thats wrong
generous-apricot•13mo ago
first controller fan - VCC and GND to FAN6, PWM - PD12
also wrong?
like described in the doc, connect the GND to a free heater port gnd, this is the enable pin, connect the red cable to a always on fan port, set it to 12 V, connect the brown/blue cable to the fan port gnd, this is the pwm pin
i am afk for w ahile
generous-apricot•13mo ago
Octopus has two always on fan ports, I need three it seems
you can connect two fans to one always on port
generous-apricot•13mo ago
I think I can connect controller fans to always on FAN6/FAN7 (and PWM ports PD12/PD13) + do the trick with enable_pin for 4028
First part work, both controller fans are running
for 4028 I should connect GND to HE3 GND (enable pin would be PB11), red to FAN0+ and PWM to PA8 (FAN0-) - like this?
no, red must be connected to a always on port which is configured to 12V
every cable needs to be connected to another connector
generous-apricot•13mo ago
Ok, so I forced to use FAN7 for 4028 and FAN6 for both controller fans
Fan GND -> HE3 GND PB11
Fan + -> FAN7 + 12V
PWM -> FAN0 GND PB8
generous-apricot•13mo ago
So yes, my idea above wont work
no, you said red to fan0+
thats not possbile
generous-apricot•13mo ago
I'm still really struggle to see the whole picture for all 3 fans
Looks like I'm stupid today
its not difficult, connect both black fan GND cavbles into PB11
both red cables into +12V from a always on port
then Fan 2 and 3 for example, for the PWM wires
PWM wires need a seperate fan conenctor, so you cant connect them together
Why don’t you connect the two fans to each other and connect one to the board
That’s how I have it setup with my arctics
generous-apricot•13mo ago
pin PB11 used multiple times in config
Indeed
use
EXP2_3
thats the alias for PB11generous-apricot•13mo ago
I think I should really do as @bulmaster
0.6A for always fan ports OK?
@bulmaster Thanks a lot, you are the best, works!