Connecting 2 12v fans

[L1ph70u]

Just in case there are not 12v, what I dont think, what does that mean for the fans?

 

[Marvo]

.............It delivers 10 amps ( the power supply) and it needs 35-90Watt so at highest 7-8 amps..............

What size wires have you used to connect them? 7-8 Amps needs a relatively thick wire, if the wires are too thin then it will mean the voltage across the actual fans will be reduced.

 

[DPG]

His fans don't need that much current.

 

[DPG]

Just in case there are not 12v, what I dont think, what does that mean for the fans?

If it isn't a 12VDC feed at that connector then it means the fans won't run correctly and you may also cause damage to the console.

 

[L1ph70u]

I meant the Conse itself needs 7-8 amps when playing high graphic games.
the fans have 0.22 and 0.29 amps
The supply gives 10 amps.
I just want to figure out why 1 fan connected to the plug will run at 100% of speed and both parallel run at the same speed at 70-80%

 

[DPG]

As I keep saying, you don't know if that connector is a 12VDC feed. So it is no surprise that the fans don't run correctly.

 

[Spoon]

But the fans are connected to a plug on the motherboard, and not to the supply

That connector for the fan may have a current limiting factor build into it, to protect the one fan.
If you have connected both fans to this connector that has only been designed for one fan then there may not be enough power to run both fans.

 

[L1ph70u]

I have another question.
Would it be okay to twist the + of both fans together and same with - and the plug it into the connector of the motherboard 0.0

 

[DPG]

I have another question.
Would it be okay to twist the + of both fans together and same with - and the plug it into the connector of the motherboard 0.0

Plug it into which connector? The same one you are already using?

Please answer: Do you know that this connector you have found gives 12VDC out at the needed current?

 

[L1ph70u]

yes I know it,
thanks for your reply .

I meant if I could twist + and + of both fans and both - together and connect the twisted + of the fans to the + of the source and same with the -

Do you understand what I mean? I'm sorry if this question is stupid but I'm no electrician.

 

[DPG]

I understand what you mean with how you are connecting them rogether yes. This is wiring in parallel, and means both fans will receive the same voltage.

 

[Spoon]

yes I know it,
thanks for your reply .

I meant if I could twist + and + of both fans and both - together and connect the twisted + of the fans to the + of the source and same with the -

Do you understand what I mean? I'm sorry if this question is stupid but I'm no electrician.

You will still have the same problem if that connector for the one fan has a current limiting factor build into it.

 

[L1ph70u]

I'm thankful for all your replys , DPG and Spoon , thanks .

If I connect them in series and we don't care about a limitation, would they both get 6V and spin almost the same speed ? IDK because they have different comsumption (0.2A and 0.29A) or is it not relevant.

 

[DPG]

I'm thankful for all your replys , DPG and Spoon , thanks .

If I connect them in series and we don't care about a limitation, would they both get 6V and spin almost the same speed ? IDK because they have different comsumption (0.2A and 0.29A) or is it not relevant.

You are missing the point I think. Is this connector actually suitable for connecting a low impedance load (ie. fans) to it? Is it designed to give a steady DC power output?

 

[James]

fans in computers are not always driven at full speed, the speed is controlled by the computer either by regulating the voltage or pulsing the voltage on and off at many times per second (pwm).

it measures the temperature of the air inside the case and the cpu, calculates the amount of cooling required and speeds up or slows down the fans to control the temperature as required.

if you believe that things are running to hot, then it is most likely a temperature sensor either dislodged or faulty.
by fitting 2 fans doing the same job, I would expect them to run slower than a single fan as the controller is slowing them down as there is plenty of cooling happening.

are you concerned that it is running to hot?
adapting computers without fully understanding what you are doing can have the opposite effect of what you are trying to achieve.