begginer in electricals, need help. (fan pcbs etc)

razaron · Jan 15, 2010

i want to make my top 2 230 fans intake but simply turning them over isnt that good since the weight of the actual fan slows down the rpm. so i was wandering how i can make them spin in the opposite direction. i was thinking it would be as easy as switching the + and - wires around but the little letters on the pcb are calling them g, v and fg. what do these exactly mean and how can i go about changing the spin direction. i will be completely opening the fans after im done eating.

also i thought it would be useful if i learnt the basics of messing about with electicals. well i know the basics since they're obvious but the little letters on pcbs scare me. so any book or guide reccomendations would be good.

thanks

MRCL · Jan 15, 2010

I don't know if that would be a good idea, the blades of the fan are designed to work in only one direction.

TheMailMan78 · Jan 15, 2010

Reverse the polarity.

razaron · Jan 15, 2010

TheMailMan78 said:
Reverse the polarity.

that was my plan but rather than + or - the wires (where they connect to the pcb) say 'G', 'V' and 'FG'

angelkiller · Jan 15, 2010

razaron said:
that was my plan but rather than + or - the wires (where they connect to the pcb) say 'G', 'V' and 'FG'

I would think that 'g' is ground and 'v' is voltage. I don't know what 'fg' is but that's probably the monitoring wire.

I say 'I think' as in I'm 99% sure.

razaron · Jan 15, 2010

meh, guess ill have to go for trial and error.

Jstn7477 · Jan 15, 2010

You can't just reverse the polarity, as the fan simply won't work (there's an electromagnet driver circuit in brushless motors.) Plus, the fan simply won't be efficient if reversed. I highly doubt that the speed loss of running the fans motor-down is large. All you would have to do is turn up your fan controller a bit (if you use one) or add voltage to the fans to achieve the new target RPM.

If you randomly dick around with your fans and their wiring without actually knowing the internal specifications of the fans, you are just asking for trouble.

razaron · Jan 15, 2010

Jstn7477 said:
You can't just reverse the polarity, as the fan simply won't work (there's an electromagnet driver circuit in brushless motors.) Plus, the fan simply won't be efficient if reversed. I highly doubt that the speed loss of running the fans motor-down is large. All you would have to do is turn up your fan controller a bit (if you use one) or add voltage to the fans to achieve the new target RPM.

If you randomly dick around with your fans and their wiring without actually knowing the internal specifications of the fans, you are just asking for trouble.

then how would i go about increasing the voltage without a fan controller?

ehume · Jan 18, 2010

You don't increase the voltage. In some cases that will burn out a fan (this happened at 19v to one poster). In other cases the fan runs louder, with more motor noise but not necessarily pushing more air - less, sometimes. This latter case is mine, when I was testing fans with a wall brick power converter that put out 17v (well, it SAID it put out 12v). I get much nicer results now with my PSU.

These fans are designed for 12v. Use them with that. And if you want to use them as intake fans, just flip them over. If they are anything like 120mm and 140mm fans, they have more difficulty pushing air up than down.

Sometimes you just have to accept that things are the way they are for a reason. This is one of them.

System Name	Staggered
Processor	Intel i5 6600k (XSPC Rasa)
Motherboard	Gigabyte Z170 Gaming K3
Cooling	RX360 (3Scythe GT1850) + RX240 (2Scythe GT1850) + Laing D5 Vario (with EK X-Top V2)
Memory	2*8gb Team Group Dark @3000Mhz 16-16-16-36 1.25v
Video Card(s)	Inno3D GTX 1070 HerculeZ
Storage	256gb Samsung 830 + 21tB Samsung F3 + 22tB Samsung F4EG
Display(s)	Flatron W3000H 2560*1600
Case	Cooler Master ATCS 840 + 1120 GT1850 (exhaust) + 1230 Spectre Pro + Lamptron FC2 (fan controller)
Power Supply	Enermax Revolution 85+ 1250W
Software	Windows 10 Pro 64bit

System Name	Fractality 1.0
Processor	Intel Core i7-860 @ 3.6GHz
Motherboard	EVGA P55 SLI
Cooling	Prolimatech Megahalems and four Fractal Design 120mm fans, sleeved
Memory	16GB Kingston Hyper RAM
Video Card(s)	PNY GeForce 580 XLR8
Storage	64GB and 180GB SSDs / 1TB and 2TB HDDs
Display(s)	24" Acer V243W
Case	Fractal Design Define R2, sleeved all I/O cables
Audio Device(s)	onboard
Power Supply	Corsair HX750W modular, sadly only stock sleeving
Software	Win 7 64bit

System Name	TheMailbox 5.0 / The Mailbox 4.5
Processor	RYZEN 1700X / Intel i7 2600k @ 4.2GHz
Motherboard	Fatal1ty X370 Gaming K4 / Gigabyte Z77X-UP5 TH Intel LGA 1155
Cooling	MasterLiquid PRO 280 / Scythe Katana 4
Memory	ADATA RGB 16GB DDR4 2666 16-16-16-39 / G.SKILL Sniper Series 16GB DDR3 1866: 9-9-9-24
Video Card(s)	MSI 1080 "Duke" with 8Gb of RAM. Boost Clock 1847 MHz / ASUS 780ti
Storage	256Gb M4 SSD / 128Gb Agelity 4 SSD , 500Gb WD (7200)
Display(s)	LG 29" Class 21:9 UltraWide® IPS LED Monitor 2560 x 1080 / Dell 27"
Case	Cooler Master MASTERBOX 5t / Cooler Master 922 HAF
Audio Device(s)	Realtek ALC1220 Audio Codec / SupremeFX X-Fi with Bose Companion 2 speakers.
Power Supply	Seasonic FOCUS Plus Series SSR-750PX 750W Platinum / SeaSonic X Series X650 Gold
Mouse	SteelSeries Sensei (RAW) / Logitech G5
Keyboard	Razer BlackWidow / Logitech (Unknown)
Software	Windows 10 Pro (64-bit)
Benchmark Scores	Benching is for bitches.

System Name	Staggered
Processor	Intel i5 6600k (XSPC Rasa)
Motherboard	Gigabyte Z170 Gaming K3
Cooling	RX360 (3Scythe GT1850) + RX240 (2Scythe GT1850) + Laing D5 Vario (with EK X-Top V2)
Memory	2*8gb Team Group Dark @3000Mhz 16-16-16-36 1.25v
Video Card(s)	Inno3D GTX 1070 HerculeZ
Storage	256gb Samsung 830 + 21tB Samsung F3 + 22tB Samsung F4EG
Display(s)	Flatron W3000H 2560*1600
Case	Cooler Master ATCS 840 + 1120 GT1850 (exhaust) + 1230 Spectre Pro + Lamptron FC2 (fan controller)
Power Supply	Enermax Revolution 85+ 1250W
Software	Windows 10 Pro 64bit

System Name	Staggered
Processor	Intel i5 6600k (XSPC Rasa)
Motherboard	Gigabyte Z170 Gaming K3
Cooling	RX360 (3Scythe GT1850) + RX240 (2Scythe GT1850) + Laing D5 Vario (with EK X-Top V2)
Memory	2*8gb Team Group Dark @3000Mhz 16-16-16-36 1.25v
Video Card(s)	Inno3D GTX 1070 HerculeZ
Storage	256gb Samsung 830 + 21tB Samsung F3 + 22tB Samsung F4EG
Display(s)	Flatron W3000H 2560*1600
Case	Cooler Master ATCS 840 + 1120 GT1850 (exhaust) + 1230 Spectre Pro + Lamptron FC2 (fan controller)
Power Supply	Enermax Revolution 85+ 1250W
Software	Windows 10 Pro 64bit

System Name	Awesomesauce 4.3 \| Laptop (MSI GE72VR 6RF Apache Pro-023)
Processor	Intel Core i7-5820K 4.16GHz 1.28v/3GHz 1.05v uncore \| Intel Core i7-6700HQ @ 3.1GHz
Motherboard	Gigabyte GA-X99-UD5 WiFi LGA2011-v3\| Stock
Cooling	Corsair H100i v2 w/ 2x EK Vardar F4-120ER + various 120/140mm case fans \| Stock
Memory	G.Skill RJ-4 16GB DDR4-2666 CL15 quad channel \| 12GB DDR4-2133
Video Card(s)	EVGA GTX 1080 Ti Hybrid SC2 11GB @ 2012/5151 boost \| NVIDIA GTX 1060 6GB +200/+500 + Intel 530
Storage	Samsung 840 EVO 500GB + Seagate 3TB 7200RPM + others \| Kingston 256GB M.2 SATA + 1TB 7200RPM
Display(s)	Acer G257HU 1440p 60Hz AH-IPS 4ms \| 17.3" 1920*1080 60Hz wide angle TN notebook panel
Case	Fractal Design Define XL R2 \| MSI
Audio Device(s)	Creative Sound Blaster Z \| Realtek with quad stereo speakers and subwoofer
Power Supply	Corsair HX850i Platinum \| 19.5v 180w Delta brick
Software	Windows 10 Pro x64 \| Windows 10 Home x64

System Name	alpha
Processor	Intel Core i7 4770k
Motherboard	Gigabyte GA-Z87X-UD4H
Cooling	Prolimatech Armageddon with 2 NF-A15's
Memory	2x4GB Crucial Sport
Video Card(s)	integrated HD 4600
Storage	Samsung 840 Pro 512GB
Display(s)	Acer KN242HYL
Case	fractal design Define R5
Audio Device(s)	headphones
Power Supply	Seasonic x-750
Mouse	Logtech Performance MX (wireless)
Keyboard	Logitech G810 (backlit wired)
Software	Win7-64

begginer in electricals, need help. (fan pcbs etc)

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