PC Wiring, Please Help

bigbull52 · Feb 20, 2013

https://www.rollitup.org/do-yourself/626614-pc-fan-wiring-please-help.html#post8711109

Photos of wiring in that thread

I've just disconnected my PC fan from my PC and wired it up to a 12 AD adapter.

Only problem is, IDK which wire on the fan is -+... It has four wires Red Blue Black and White.

I assumed the black and white were -+ and wired them to the -+ of my adapter. Im nervous about the other two cords though, because I couldnt find
a fan online with the wiring this fan has

Any one got any tips? please.

Nitro1990 · Feb 20, 2013

the blue and and white will be for the fan speed control by the pc red is your live black is you neutral

just tape them up

bigbull52 · Feb 20, 2013

Yea i got it, i was extra high, and the fan actually told me which was which haha.

When I got it to turn on, I noticed it was goin REALLL slow compared to how it was on my computer... WHy?

Nitro1990 · Feb 20, 2013

what voltage plug you using?

bigbull52 · Feb 20, 2013

Its a 12 volt, same as the fan.

I noticed the amps were lower though

the fan says 1.3 amps, but the plug says .5

Nitro1990 · Feb 20, 2013

i use a 15v laptop charger to power my 12v fan and its 1.2a and my fan is fast as hell

and i noticed you said something about a "12 ad adapter " do you mean DC?

and i noticed o your other thread that you had put the wires white to black/white and black to black have you changed this?

bigbull52 · Feb 20, 2013

Yes, I changed the white wire to the red wire.

On the charger, it says 12v ad. I thought it was AC, but it says AD... DC are the larger three prongs correct?

This has two prongs.

SiliconeBud · Feb 20, 2013

bigbull52 said:
the fan says 1.3 amps, but the plug says .5

Thats your problem right there. Your Power supply (P/S) can only source 1/2 an Amp and you you need 1.3Amps. So your fan at full speed is drawing more current then your power supply can source causing the voltage to drop.

You need to find a 12v power supply that can give more juice. As nitro said, a good laptop P/S works good, and you will have to cut off the plug and find a way to attach the wires. Not a great idea but a car charger would be a good way to "TEST" if your fan if it's working properly.

Cheers
- SB -

bigbull52 · Feb 20, 2013

its working, but thank you..

I found a plug, its got a huge ac or dc w.e box on it. should I cut that part off, or just the point?

navyfighter04 · Feb 21, 2013

bigbull52 said:
its working, but thank you..

I found a plug, its got a huge ac or dc w.e box on it. should I cut that part off, or just the point?

Hey big....Is your fan AC, DC, or both????
You can hook it up to a 9 volt battery if you wanted too.

bigbull52 · Feb 21, 2013

navyfighter04 said:
Hey big....Is your fan AC, DC, or both????
You can hook it up to a 9 volt battery if you wanted too.

The plug im using says "AD".... Its a router plug I believe but not positive.

I found a better cord with more amps (2) Will it be ok to use a 2amp plug, when my fan only need 1.3?

This plug is AC/DC

should i cut this box off or leave itt

navyfighter04 · Feb 21, 2013

bigbull52 said:
The plug im using says "AD".... Its a router plug I believe but not positive.

I found a better cord with more amps (2) Will it be ok to use a 2amp plug, when my fan only need 1.3?

This plug is AC/DC
View attachment 2535501

should i cut this box off or leave itt

Well the box is what makes the power at 2 amps. Its too much for the fan. you will burn it out. And cutting it off just gives you a basic 15 amp, 120 volt plug. You need a plug thats 1 to 1.3 amps. Under one and your fan will barely blow. Too much and it will burn out. Go out and find a wall charger for a cell phone. Or a charger for a laptop. Most are between 1-1.5 amps. You could also go get a resistor at radio shack and wire it into the plug and box to reduce the power to 1.0 amp.

navyfighter04 · Feb 21, 2013

navyfighter04 said:
Well the box is what makes the power at 2 amps. Its too much for the fan. you will burn it out. And cutting it off just gives you a basic 15 amp, 120 volt plug. You need a plug thats 1 to 1.3 amps. Under one and your fan will barely blow. Too much and it will burn out. Go out and find a wall charger for a cell phone. Or a charger for a laptop. Most are between 1-1.5 amps. You could also go get a resistor at radio shack and wire it into the plug and box to reduce the power to 1.0 amp.

Btw the box that is connected to the plug you are talking about is ac-dc. It clearly says it on the top first line. AC_DC Adapter. So its putting out DIrect Current while bringing in Alternation. So the fan will also have to be a Direct Current fan to use this..

bigbull52 · Feb 21, 2013

navyfighter04 said:
Btw the box that is connected to the plug you are talking about is ac-dc. It clearly says it on the top first line. AC_DC Adapter. So its putting out DIrect Current while bringing in Alternation. So the fan will also have to be a Direct Current fan to use this..

Yes, I said the box in the picture was AC_DC.

However, thats not the plug im using.

If I use this plug, will the fan burn out quickly? or will I be able to use it for months??

Also, is it a fire hazard to go over .7 amps?

navyfighter04 · Feb 21, 2013

bigbull52 said:
Yes, I said the box in the picture was AC_DC.

However, thats not the plug im using.

If I use this plug, will the fan burn out quickly? or will I be able to use it for months??

Also, is it a fire hazard to go over .7 amps?

IMO it will run for a short time then burn out. Ive ran too much power through a fan before and it burned out the motor in less than an hour. Go ahead and try it if you want. But if your running AC to the fan, i wouldnt run more amps to the fan then what its max is....IMO

SiliconeBud · Feb 21, 2013

bigbull52 said:
Yes, I said the box in the picture was AC_DC.

If I use this plug, will the fan burn out quickly? or will I be able to use it for months??

No you are fine, what matters is the voltage not the amperage. If you had a 30v DC and 2amp power supply then yes this will burn out your 12v motor.

12v/2Amp DC power supply for 12v 1.3Amp Fan is good.

Cheers
- SB -

navyfighter04 · Feb 22, 2013

SiliconeBud said:
No you are fine, what matters is the voltage not the amperage. If you had a 30v DC and 2amp power supply then yes this will burn out your 12v motor.

12v/2Amp DC power supply for 12v 1.3Amp Fan is good.

Cheers
- SB -

Not trying to start anything. But you are wrong. Volts is not the only thing that will burn out the motor. Too much amperage will too. Ive built dozens of Igniton Boxes for pyrotechnics running DC and AC. When you run too many amps to something, it will burn out the same as to much volts. A lot of fans will say they can run on 12-24 volts. Thats 12,13,14,15,16,17-24. Any voltage will work within its power range. But the amps E.G. 1.3, will not be able to be increased safely. Especially since the AC to DC converter box uses a resistor to lower the amperage from 15 amps to 2 amps. Believe me, it will burn out. If you dont believe me, try it. All i no is im not plugging in a fan that i rigged up with a Ac to DC converter thats 2 amps which is hooked up to a fan thats 1.3 amps. Fire hazard waiting to happen.....

Nitro1990 · Feb 22, 2013

yeah running something rated at 1.3a at 2a is a fire waiting to happen, they dont just put these on the label for fun its a SAFE working limit

SiliconeBud · Feb 22, 2013

Yes I don't want to start anything either but this is basic electronics. Example a PC 300watt power supply (or approx 60amps DC). Doesn't mean your computer is using all 60amps, but this is the max it can supply. If you keep adding hard drives or video card that exceeds this then you need a power supply that gives more current (AMPS) to your PC, and you upgrade your power supply too.

So if bigbull is using a power supply rated at 12v 2 amps and his fan requires 12v 1.3 amps he is under the amount of current the P/S can source so he is good. This doesn't mean 2 amps is going to the fan but the fan is only drawing 1.3 amps at 12volts.

If bigbull added another fan, same size of 1.3 amps, then the total current load between the two fans is 2.6amps, which is above his current power supply. But if he used the same power supply then the 2.6amp current draw would over load the power supply. He would see a voltage drop to approx 7 volts and start over heating his power supply. NOW YOU HAVE A FIRE HAZARD.

This is why his first power supply 12v 500mA couldn't drive the fan and was spinning very slowly, to meet the damand of the fans 1.2amp load the voltage had to give way.

Cheers
- SB -

PC Wiring, Please Help

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