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120mm fans from cnc machine - need help wiring

post #1 of 7
Thread Starter 
I just completed a pc build and I have 8 120mm fans I pulled out of a cnc machine that was being scrapped and would like to use some of them in my case. My case came with 2 120mm fans and has room for about 5 or 6 more. the problem is the fans that came with the case both have a 3 pin connector that goes to the motherboard but my motherboard only has 1 plug for a case fan. Until I figure out what to do I can only run 1 fan. Eventually I am going to get a fan controller but for now I need to figure out a short term fix (hopefully wiring them to the power supply for now). To make things more difficult I have no idea how to go about wiring the fans from the cnc machine (pictures at bottom of post). I would really like to use the fans from the cnc machine as I know those fans are higher quality and have more air flow than your standard pc case fan. My guess on the wiring is that the extra wires are for sensors that cause an alarm on the machine if a fan malfunctions but beyond that I have no idea and could be totally wrong. If it helps on the back of the fans it says: 20w AC 200v 50/60Hz 15/13w.

How would I wire the fans (if possible) to my power supply until I get a fan controller? How do I wire the fans to the fan controller when I finally get it? Also any recommendations for a fan controller that can run 6 or more fans with an automatic mode (and not too expensive)?

Here are the specs of my build:

ASUS DRW-24B1ST dvd drive
HITACHI Deskstar 7K1000.C 1TB hard drive
Patriot Signature 4GB 240-Pin DDR3 memory
AMD Phenom II X6 1090T processor
Diablotek DA Series PSDA600 600W power supply
GIGABYTE GA-880GMA-UD2H motherboard
HEC Blitz Black Steel Edition ATX Mid Tower case

Fan Pics:










Edited by xxjdoggxx - 2/24/11 at 11:00pm
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6 Core Build
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Phenom II X6 1090t GIGABYTE GA-880GMA-UD2H ATI Radeon HD 4250 (onboard) Patriot Signature 4GB 240-Pin DDR3 memory (1x4gb) 
Hard DriveOptical DriveOSMonitor
HITACHI Deskstar 7K1000.C 1TB hard drive ASUS DRW-24B1ST dvd drive Windows 7 Ultimate 64bit Acer x221w (diy projector eventually) 
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Microsoft wireless keyboard Antec TruePower TP-650 650W Power Supply HEC Blitz Black Steel Edition ATX Mid Tower case Microsoft Sidewinder x8 
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post #2 of 7
Fans with 3pin connectors have these 3 lines:
*+12V
*GND (ground)
*feedback - used to measure the RPM
Here's a detailed explanation of which wire has which voltage: CLICK.

If you want to connect it to the PSU, I suggest you pass thru a MOLEX connector. The MOLEX has a +12V, two GND and one +5V: CLICK.

To power the "n" fans you do like this:
*remove a MOLEX plastic header to expose the 4 wires and tag which wire has which voltage
*remove all 3pin plastic headers from the fans and tag which wire has which voltage - you will not need the "feedback" wire, so you can isolate it with duct tape
*depending on the voltage you want to give to the fans (and thus their speed/noise) you can connect the fans like this:
1.fan's GND goes on Molex' GND (whichever of the two molex GND you want)
**fan's +12V can go either on molex':
***+5V for low speed & silence; however be careful as some fans can't even start on only 5V
***+12V for full speed operation
2.fan's GND on molex' +5V
**fan's +12V on molex' +12V - this way the fans will be powered with +7V (12-5) - this is usually a good balance between silence and airflow.

My advice is to take the time to identify which wire has which voltage. You should connect the wires exactly as I said, if you have any questions do ask. If you make a mistake you could potentially short the PSU, but if you do things properly you'd have the best and cheapest fan controller as you can set all fans at any of 3 possible speed grades. The last advice is to properly isolate with duck-tape all connections, you don't want something shorting.

Cheers
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Centurion
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post #3 of 7
the cnc fans are 110-220v

they can work, but you will need to mod the psu for them
you can use a 12v relay to switch the fans on


but running 110ac through the case wouldnt be a good idea imo
post #4 of 7
As above. the fans that you have photographed are 110v or 240v. No good for your pc
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post #5 of 7
I would not go anywhere near those in a case they are 200V AC.
I would never want wires in my case with that much voltage or current in them.
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post #6 of 7
Even if you did get them running, i'll bet they would be extremely loud anyway.
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Black Sunshine II
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120GB Intel 510 SSD Samsung 1TB F1 LiteOn iHAS324-98 Y Cougage Tru Spirit (lapped) with Akasa Viper Pu... 
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post #7 of 7
Thread Starter 
I kind of figured since they are ac they wouldn't work. I was hoping someone knew a way to use them but I guess I'll have to buy some fans. Any suggestions for 4 120mm fans and a controller (preferably that regulates automatically)? Also is it ok for now to run with just 1 120mm fan or should I try to hook up the second one (which also has a 3 pin motherboard connector)?
6 Core Build
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CPUMotherboardGraphicsRAM
Phenom II X6 1090t GIGABYTE GA-880GMA-UD2H ATI Radeon HD 4250 (onboard) Patriot Signature 4GB 240-Pin DDR3 memory (1x4gb) 
Hard DriveOptical DriveOSMonitor
HITACHI Deskstar 7K1000.C 1TB hard drive ASUS DRW-24B1ST dvd drive Windows 7 Ultimate 64bit Acer x221w (diy projector eventually) 
KeyboardPowerCaseMouse
Microsoft wireless keyboard Antec TruePower TP-650 650W Power Supply HEC Blitz Black Steel Edition ATX Mid Tower case Microsoft Sidewinder x8 
Mouse Pad
na 
  hide details  
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6 Core Build
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X6 1090t GIGABYTE GA-880GMA-UD2H ATI Radeon HD 4250 (onboard) Patriot Signature 4GB 240-Pin DDR3 memory (1x4gb) 
Hard DriveOptical DriveOSMonitor
HITACHI Deskstar 7K1000.C 1TB hard drive ASUS DRW-24B1ST dvd drive Windows 7 Ultimate 64bit Acer x221w (diy projector eventually) 
KeyboardPowerCaseMouse
Microsoft wireless keyboard Antec TruePower TP-650 650W Power Supply HEC Blitz Black Steel Edition ATX Mid Tower case Microsoft Sidewinder x8 
Mouse Pad
na 
  hide details  
Reply
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