Can you daisy chain 4pin PWM fans???

[Lynx]

For my latest project i got 7 xilence red wings, 4pin pwm, i need to daisy chain 4 of them to one knob on my fan controller? i may have to investigate into a soldering iron aswell unless someone wants to do it for say a £5? +pnp both ways?

 

[Rastalovich]

In rough terms, u use the +ve & -ve lines together for the voltage (red/black normally) - but just use 1 of the rpm lines from 1 of the fans (normally yellow). With a 4pin, same deal with the rpm, u want to retain 1 pwm line from one fan. In this case u use 1 fan to handle all the sensing.

U could diy this urself very easily. Key would be if u wanted to keep the fan connectors intact for future use. In this case u'd want to get some 4pin extensions.

 

[Lynx]

tbh dude i understand your trying to help. but electronics and diy really arnt my thing..

im more the digital media side of electronics im doing engineering in college after my course that starts in aug.

 

[Rastalovich]

http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=82&products_id=23440

If u could get one of these, the job is pretty much done in terms of keeping the fans intact. I'd probably either look for a 4 pin version, or... trim the plastic on the connectors so he 4 pins sit on the 3.

 

[Lynx]

Good idea rasta i look into it, thx +reps

 

[Freak]

Reading around:

http://www.watercoolinguk.co.uk/forums/showpost.php?p=117487&postcount=9

Also on http://www.watercoolinguk.co.uk/forums/showthread.php?t=2410

It looks like its 4 watts on the mobo header. So only one fan.

Any more and you will need to use either a fan controller - prolly the best way. Or to use the psu molexs

 

[mayhem]

dont do 4 pwm fans together, only 2 even on a fan controller.

 

[Freak]

Whats the reason for that?

Thought going throught head, you know that when daisy chaining the yellow wire is cut except for one?

 

[mayhem]

Because of the amps / Volts they pull. youll mess up a MB or Fan controller.

You shold never put more than 2 fans in one point unless its a self made one.

 

[Rastalovich]

Decent fan controller to even be thinking of attaching a fistfull of fans, shouldn't be drawn from a mobo header, and should take power from the psu itself.

The pwm controllers within the bios of mobos these days are worth bothering with.

 

[Freak]

Because of the amps / Volts they pull. youll mess up a MB or Fan controller.

You shold never put more than 2 fans in one point unless its a self made one.

I understand that through a header, But i thought that a fan controller would be able to handle it. Ones mentioned in the above post. Rhombus or something...

 

[mayhem]

the Sunbeam would be the best it can handle 3 fans on 1 line. Any thing else probs not.

Rhino bus i wouldn't know because i don't know there power output.

e.g in you post ->

As direct to molex or you you wanted a 3 way switch for 5v, 7V and 12V (using resistors) on to 3 fans at a time.

Or even - 5v, Off, 12v

or 4 way switch

off, 5v, 7v, 12v

Last but not least 5 way

off, 3v, 5v, 7v, 12v

Not to hard to do mounted though a case. resistors 1p each - switch £1 to £3 each.

The only problem with 3v is that you need to get fans that can handle such a low current as el cheap o fans will not normaly spin at 3v.