PWM splitter issue

[Niva2121]

I have made a pwm splitter for some delta fans but having the issue were they just run at full speed.

If i plug one directly into sys_fan2 it works as it should, but once i try to run the splitter with multiple fans and using the molex etc they stick at 100%

Have tried so many combinations of wiring now, its 4am and im throwing in the towel haha had enough

Any ideas?

 

[ATMINSIDE]

What splitter is it?
Which Delta fan?

 

[Conumdrum]

Aha, cut One of the SENSING wires off one of the fans. You are feeding TWO PWM signals to the Mobo probably, thus confusing the RPM input circuits on the mobo.

 

[Niva2121]

Made the splitter myself.
40ml brushless deltas out of a server
Def only running one tach cable

 

[ATMINSIDE]

Does one of them work by itself on the main side of the splitter?

 

[Niva2121]

Yep just flat out haha,

Im thinking maybe its confused and thinks there is no fan connected so its defaulting to full speed. Either because the 12v+ isnt connected or the ground. But honestly im just guessing.

Motherboard is a z68xpUD3 .
Running of the SYS_FAN2 socket.

 

[ATMINSIDE]

Definitely an issue with the splitter you made then.
Did you test continuity on each wire through the connector?

 

[Niva2121]

No, although i did remake the whole thing with fresh bits and solder instead of twist and tape

- - - Updated - - -

Appriciate the help btw

 

[ATMINSIDE]

That'd be my first idea, to check continuity on the sense wire and the signal wire. (obviously the + and - are good)
Also, I've seen some fans before with the signal and sense reversed. Would be worth looking in to, but I doubt it's the issue.

 

[Niva2121]

Ok, using another hackjob splitter, both fans function correctly running off the fan socket ( not using molex)

Obviously this isnt a solution as they draw nearly 1 amp each and i have another 6 mounted and waiting for power haha

Interesting though

 

[Niva2121]

That'd be my first idea, to check continuity on the sense wire and the signal wire. (obviously the + and - are good)
Also, I've seen some fans before with the signal and sense reversed. Would be worth looking in to, but I doubt it's the issue.

10 points!! Wires where the opposite of what they were supposed to be. Didnt even notice one was going normal speed for some reason. I dunno. Im going with lack of sleep haha. 8 up and running now. Wow!

Thanks heaps for your help mate.

 

[ATMINSIDE]

WOOOO! Glad you got it working!

For future reference, these are cheap and work well:
http://www.swiftech.com/8-WayPWMsplitter-sata.aspx

 

[GTXJackBauer]

For future reference, these are cheap and work well:
http://www.swiftech.com/8-WayPWMsplitter-sata.aspx

+1

 

[Niva2121]

+1

Results:
8 delta fans pointing at GPU, dropped 1 degree. Back to the drawing board haha