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Fans

Goetz

Junior Member

Fans

Samstag, 28. Juli 2012, 07:37

I just set up my aquaero 5 Pro, I love it but I'm still learning how to use it and I have some questions.

I have 3 fans attached with a 3pin to 3 x 3pin adapter to the first fan controller and the RPMs are jumping all over the place! Is that normal when hooking up 3 fans to one port on the aquaero or do I need to get a different 3pin adapter? I'm also hearing some humming coming from the 3 fans at 12v, they are brand new corsair sp120s quite edition, so I don't know if that's just the way they are or if it's because I have 3 of them connected to one output, is there a way to calibrate the fans or would I be better to just put each one on it's own connection?

I also have 3 of the same fans connected to ports 2, 3, and 4 on the aquaero and all of them show a different rpm at 12v and the last one connected to port 4 will only go up to 11.9 v even when it's set to 12v.... is that normal?

Thanks for the help!

cc01

Full Member

Samstag, 28. Juli 2012, 09:29

When you have several fans connected to the one header the tacho signal will jump up and down, this is normal. With the 3x3pin power board, you are effectively confusing the tacho input with three different signals at once, hence the unstable signal. To get a stable tacho signal for each fan you would have to connect only one fan per header on the aquaero, which means a maximum of four fans on the aquaero.

No idea why your Corsairs are humming ... Try connecting just one to each output instead of three and see if you still notice the humming. You can adjust how much power the fans receive from the aquaero in the aquasuite software. You have multiple control options to choose from provided you have temperature sensors installed and it will adjust the fan speeds up or down according to the input data.

Its normal for individual computer case fans to show different rpm data at the same voltage as they are not manufactured to such strict tolerances. A fan rated at 1200rpm at 12V, for example, might show 1250rpm and another fan might show 1190rpm. To keep the manufacturing costs of the fan down they are not made to meet precise tolerances and in terms of performance there would be little difference between the two. The fan specs should probably say 1200rpm +/- 10%, and it is nothing to worry about. It doen't mean your fans are faulty. It is also normal for some fan headers to slightly drop voltages, so at 100% output a 12V header might only show 11.9V. Again, I think it has to do with manufacturing tolerances, or it might be because there is a slight voltage drop at a physical connection such as where you plug a cable into a header. I'm not entirely sure but if anyone else could share some understanding of electronics, I would like to know the exact reason for this too.

Hope this helps. :)

Goetz

Junior Member

Sonntag, 29. Juli 2012, 09:28

Yes that does help, thanks for the explanation. I'll try just plugging one fan in and see if it still gives me the same noise. It could just be from the air in between the fan and the rad. I have some fan silencers coming in the mail and I'll try those out too.

impac

Newbie

Dienstag, 31. Juli 2012, 08:24

Or, you can get a 3x3 fan header, and only ENSURE 1 of the tachmeters is connected. In effect, if they are the same fans, they will get the same power, and thus only 1 of them is needed. I do that with mine, and I am able to hook up to 3 fans in port 1, 4 fans in port 2, and 4 fans in port 3.. port 4 is empty. Hope that helps as well.

NOTE: if your 3 fan header has ALL 3 of the tach's in place.. leave one of them, and cut the other two.

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