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Wiring For G5 Fans


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#21
HacOSXuser

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ohhh i get it now. well around the summer time when i work on my friends g5 mod ill try it out.

#22
stellarola

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Wow, I just hooked up one of these fans. It's incredibly powerful and loud.

-Stell

#23
teknojunkie

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Wow, I just hooked up one of these fans. It's incredibly powerful and loud.

-Stell


you can make them quieter by separating the 5v and the 12v into its own molex

#24
nervouschimp

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you can make them quieter by separating the 5v and the 12v into its own molex


No.

You make them quieter by running both voltage lines on 5V

5V
ground
ground
5V

that will quiet them down a bunch.....

#25
teknojunkie

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No.

You make them quieter by running both voltage lines on 5V

5V
ground
ground
5V

that will quiet them down a bunch.....


oh sry that wat i meant lol

#26
stellarola

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It worked, but either way, the fans are loud as balls. seriously.

-Stell

No.

You make them quieter by running both voltage lines on 5V

5V
ground
ground
5V

that will quiet them down a bunch.....



#27
teknojunkie

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I got like 5 G5 fan fans I will sell them just PM of you want them for what price

#28
Baudouin

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The two 92 mm fans that are fixed to the back of the case. I fiddled with these for some time, but they would not fire up! All the others work though.


I got them working. It is a tricky connection .You can see the pictures @ the posting 8 http://forum.insanel...mp;#entry735747

But I was reading what I wrote and pictured before and realized that I had first unplugged the wires. I use a spare couple of fans to make the connections with the wires in the original positions.

Attached File  IMG_5226.JPG   51.04KB   978 downloads


With the plug in this position, connectors numbered from 1 to 6 starting from the bottom , the connections are :

1 to n/a or black : RPM fan A
2 to red : 5V fan A
3 to yellow : 12V both fans
4 to black : neutral both fans
5 to n/a or black : RPM fan B
6 to red : 5V fan B

views from the Molex plug :

@ 12 V speed, which is little loud
Attached File  IMG_5227.JPG   55.11KB   864 downloads

@ 7 V speed, which is a little less loud
edit : strangely enough this would be in fact @7V. I found a way to get them less louder, which would be @5V. But I have not measure the voltage. I will post pictures later. (29/05/08 09.22 AM Brussels time)
Attached File  IMG_5228.JPG   56.62KB   918 downloads

1 to n/a or black : RPM fan A
2 to red : 5V fan A
3 to red : 12V both fans
4 to black : neutral both fans
5 to n/a or black : RPM fan B
6 to red : 5V fan B

#29
vaporATX

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Kinda off topic here, but it does relate to the issues of the fans used in these machines and the similar fans in the Mac Pro. Have any of you heard a MacPro under load? Thing sounds like a helicopter spooling up for take off. Why is it that Apple uses such loud inefficient fans? I mean it's not like these machines are cheap. I mean a three blade high pitch fan? Are they crazy? Have any of you using these cases thought of maybe replacing these fans with some 92 mm seven blade Silenx fluidic bearing fans painted to match the stock fans?

#30
Baudouin

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I made this Diagram for the Back G5 Fans

Please tell if there are any mistakes so I can fix it


Great amantheboy08!!! Nice and clear draw! :( Congratz. If you could specify that's the connection @ 12V, which is loud. If you would make another draw with the connection @ 7V, it would be perfect. In the meantime I found the way to connect @5V, which is very silent but really slow.

#31
teknojunkie

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sure no problem will do. I made this Diagram for the Back G5 Fans Please tell if there are any mistakes so I can fix it

@edit diagram for 12v speed and 7v speed

Attached File  G5_diagram_12v.jpg   101.97KB   938 downloads



G5 Pci and Cpu Fan Coming Soon :(

#32
Baudouin

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sure no problem will do. I made this Diagram for the Back G5 Fans Please tell if there are any mistakes so I can fix it

@edit diagram for 12v speed and 7v speed

Attached File  G5_diagram_12v.jpg   101.97KB   938 downloads
Attached File  IMG_5227.JPG   55.16KB   279 downloads

Attached File  G5_diagram_7v.jpg   99.4KB   525 downloads
Attached File  IMG_5228.JPG   56.67KB   263 downloads
G5 Pci and Cpu Fan Coming Soon :)


Your diagrams are correct, based on my pictures showing what I would call the "test connections" when I was trying to find the good combinations. Just one thing I used a double Molex plug from an Y cables . That's why on your dia, there are two yellows and reds on the right side of the Molex and two blacks together. Which could be confusing, it would be better to show only one of each yellow and red and two separated black as on an usual molex. Check the next picture on the right side, it should be the same on your Molex right side on the upper draw from each diagram.The left side of the next picture shows the Y double wiring .Thanks.
Attached File  IMG_5274.JPG   66.21KB   466 downloads


After soldering, the wires connections are different : I soldered all voltage wires from the fan to one wire, red in this case. and the RPM's and neutrals from the fans are connected separately to one neutral from the Molex.
Attached File  IMG_5289.JPG   75.98KB   413 downloads
Attached File  IMG_5290.JPG   72.43KB   244 downloads
Attached File  IMG_5282.JPG   70.47KB   275 downloads
Attached File  IMG_5283.JPG   43.7KB   227 downloads


Concerning the 5V connection, I discovered that if I connect the Voltage wires from the fans to the red from the Molex and the RPM's from the fans to the neutral from the Molex, without connecting the Fans neutrals to the neutral from the Molex, I get a very slow speed I guess must be 5V .

Neutrals fans and red : too fast to be 5V, less fast and noisy than 12V
Attached File  IMG_5285.JPG   46.71KB   222 downloads
RPM's from fans and red : very slow could be 5V
Attached File  IMG_5284.JPG   54.65KB   211 downloads
Will test with a PSU fan onto the molex and compare the speeds with the G5 fans.

#33
teknojunkie

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so u used to molex cables for one wire.

#34
teknojunkie

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Some more diagrams for the PCI Fan and the HDD Bay Fans :)
Please make sure they are correct :D , so no one screws up their fans

Attached File  PowerMac_G5_HDD_Bay_Fan__12_5v.jpg   117.23KB   646 downloads

Attached File  PowerMac_G5_Pci_Fan__12_5v.jpg   96.67KB   473 downloads

#35
teknojunkie

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Your diagrams are correct, based on my pictures showing what I would call the "test connections" when I was trying to find the good combinations. Just one thing I used a double Molex plug from an Y cables . That's why on your dia, there are two yellows and reds on the right side of the Molex and two blacks together. Which could be confusing, it would be better to show only one of each yellow and red and two separated black as on an usual molex. Check the next picture on the right side, it should be the same on your Molex right side on the upper draw from each diagram.The left side of the next picture shows the Y double wiring .Thanks.
Attached File  IMG_5274.JPG   66.21KB   466 downloads


After soldering, the wires connections are different : I soldered all voltage wires from the fan to one wire, red in this case. and the RPM's and neutrals from the fans are connected separately to one neutral from the Molex.


Concerning the 5V connection, I discovered that if I connect the Voltage wires from the fans to the red from the Molex and the RPM's from the fans to the neutral from the Molex, without connecting the Fans neutrals to the neutral from the Molex, I get a very slow speed I guess must be 5V .

Neutrals fans and red : too fast to be 5V, less fast and noisy than 12V

RPM's from fans and red : very slow could be 5V

Will test with a PSU fan onto the molex and compare the speeds with the G5 fans.


Very nice baudouin, also coud you make a pinout for this like where each wire goes so i can make a diagram out of it thanks I tried the 21V Cools really good, but loud as hell, gonna try the 5v all we need is a 3 way switch to switch from 12v, 7v and 5v. did u try the G5 cpu fans.

#36
Baudouin

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Very nice baudouin, also coud you make a pinout for this like where each wire goes so i can make a diagram out of it thanks I tried the 21V Cools really good, but loud as hell, gonna try the 5v all we need is a 3 way switch to switch from 12v, 7v and 5v. did u try the G5 cpu fans.


Thanks. I am three days home from tomorrow and I will work on the pinout.
I guess you meant 12V, not really 21V ? :)
I did not try the CPU fans because I cannot use them, the way I install my Mobo inside the opening door as in the G3, G4 tower cases. But I had a look and it should be easier than the back fans.

edit: wrong assumption :

The are also 6 connections, 2 double wires, one wire from each fan, one double is for 5V to connect to the red cable from molex and one for the neutral to connect to the black from the molex. And then there are four single wires I guess also one per fan for RPM and the other for 12V to connect to the yellow cable from the molex. I have checked this after my night shift. I hoped the people from Apple have been logical, but no. The wires are connected to the Apple plug on two lines, two singles on the way up and four on the bottom line,the two double on the right side and the two single on the left side if you take the plug facing you with the small plastic thing above. It does not mean that the two above are for RPM and the four at the bottom are connected as on a molex . I explain in the next post how to. In the evening after 08.00 PM Brussels time I will take some pictures and make a pinout.
See you later alligator. :thumbsup_anim:

#37
Baudouin

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OK I just slept some hours and test the CPU fans. The four at the bottom are to be connected as:
the external double to 5V red cable, the internal double to the neutral black cable, the external single to 12 V yellow cable fan A and the internal single not applicable or to black cable cause is the RPM for fan A. The two upper cables are : the external single to 12V yellow cab fan B and the internal single N/A or black : RPM fan B.
These connections are of course very loudy : 12V . You reduce to 5V by connecting all voltage cables 12V and 5V to the red cable from the molex .
Pictures and pinout later on, got to sleep... -_-

Edit 06/05/08 :

Looking at this picture from you :
Attached File  n554566894_620128_4209.jpg   30.84KB   415 downloads

if then we use your picture for the PCI fan as the four connections at the bottom of the Apple plug in previous photo :
Attached File  PowerMac_G5_Pci_Fan__12_5v.jpg   96.67KB   358 downloads

We get :

1 = 12V fan A
2 = RPM fan A
3 = Neutral
4 = 5 V both fans

and the two upper connectors from the Apple plug will be :

A = 12V fan B
B = RPM fan B

#38
Baudouin

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I labelled first all the wires before connecting them because the wires are short.
Attached File  IMG_5297.JPG   58.78KB   310 downloads

I made a provisoire connections

Attached File  IMG_5296.JPG   65.34KB   343 downloads

Then I attached the new connections to the molex . As 12V was really loud I connected all the voltage wires to the red cable from molex(5V)
Attached File  IMG_5300.JPG   67.5KB   402 downloads

#39
teknojunkie

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thanks i will make a diagram of this, nice wanting to this for awhile

#40
Baudouin

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You just use a molex connector watch go from right to left the 12v(red) connects to the first wire, the two grounds(the 2 middle cable), and the 5v (yellow) connects to the last one. You can make them quieter by spliting the 5v on one molex and the 12v's on one molex.

I put a Pic at the top :D


amantheboy08, concerning the colours, it is the other way around, yellow=12V and red=5V :D





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