Mainboard cooling fan and part cooling fan linked?

[allylikesu]

Describe the bug
I'm not sure if this is an inherent flaw in the SV06's design, or a wiring flaw, or a firmware flaw, but it seems that the mainboard cooling fan is linked to the part cooling fan. I noticed this when I was printing without the part cooling fan on, and got stepper driver overheating warnings in Mainsail interface.

To Reproduce
Steps to reproduce the behavior:
Turn the fan off in Mainsail's dashboard. Examine both part cooling fan and mainboard fan for movement.
Turn fan to 100% and check on both again.

Expected behavior
Mainboard fan is statically set to 100%, or automatically set based on stepper driver temps

What printer are you using?

SV06 with stock fans and mainboard

What kind of device are you using to host Klipper?

Pi 4B running MainsailOS

How did you install Klipper?

MainsailOS

Is your local copy of this configuration up to date?

I installed it yesterday.

What slicer are you using?

PrusaSlicer

Are you using the config bundles from this repo?

Yes

Did you Adjust your slicer?

I used the provided config bundles

Additional context
I can't inspect the mainboard right now, as I have a print running. I have a desk fan pointed at the mainboard enclosure, which seems to be doing the trick for now.

[bassamanator]

By design? Who knows. Myself, I see it as a sign of neglect.

In any case, the behaviour that you observed is 'normal'.

The user @BeauSlim has a mod for the fans found here.

[jumika]

@allylikesu You can also wire the fan to a fix 24v source on the board.

[alber70g]

Question regarding this: does the mainboard fan turn on when printing? Or also in pre-printing startup. I get a lot of times a Stepper driver warning, OTPW Flag.
I was wondering if the fan even turns on. With this airflow and the cooling parts it should stay cool enough, right?

I suppose K-FAN1 and K-FAN2 are the case fans: https://www.sovol.tech/products/sovol-32-bit-silent-mainboard-sv06-sv06plus as reference

In the "Fans" section there's only one,

https://github.com/bassamanator/Sovol-SV06-firmware/blob/master/printer.cfg#L172C1-L178C1

[fan]
pin: PA0

[bassamanator]

the mainboard cooling fan is linked to the part cooling fan

First paragraph

The warnings might go away after a klipper update.

[BeauSlim]

There is only one entry in the Klipper config because the K-FAN1 and K-FAN2 ports on the board are tied together electrically. Their speed is controlled by a single pin from the CPU. There is no way to fix this in settings alone. You have to rewire.