I have not been able to get my new case fan running when it's plugged
into the motherboard. So I'm going to try connecting it to the power
supply with an adatper. Just one question: Once I've connect the fan
to the power supply, is it still possible to plug that white "signal"
wire into the motherboard? (for monitoring the fan speed). Or will
this damage the board? Sorry if it seems like a stupid question. I'm
still fairly new at this.
Bryan
how about giving us some details...Fan make and model?? Motherboard make and
model? Power supply make and model??
There are adaptors that will still let you plug the "speed sensor" into the
mobo while the fan runs off the PSU...but since your mobo does not want to
power the fan what makes you think it will read the sensor??
peter
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<Totalrod2@aol.com> wrote in message
news:b8b7301b-e997-4011-885f-0309f9722000@d5g2000hsc.googlegroups.com...
> I have not been able to get my new case fan running when it's plugged
> into the motherboard. So I'm going to try connecting it to the power
> supply with an adatper. Just one question: Once I've connect the fan
> to the power supply, is it still possible to plug that white "signal"
> wire into the motherboard? (for monitoring the fan speed). Or will
> this damage the board? Sorry if it seems like a stupid question. I'm
> still fairly new at this.
> Bryan
Using a 1x4 Molex to 1x3 adapter, with a separate wire for the sensor,
to the motherboard header, works fine. I use that on a computer here,
and haven't had a problem with it. You can buy adapters like that,
or the ones I got, actually came as an accessory with the fan itself.
The best ones come with two 1x4 Molex, a male and a female, so you
can daisy chain the powering of more than one fan, from a single
power supply cable connector.
This one happens to have two wires on the middle, sensor cable. But the
one I've got, only has the yellow wire on the middle connector. The
ground on all the components is the same, so the black wire on the
middle connector is redundant in this case. (The black wire running
to the Molex 1x4, establishes the ground connection.)
Thanks again Paul. I'm just waiting for my Fedora 8 (Linux) DVD to
arrive. It was $3.45 with shipping! Windows Vista is $300. Now let's
hope I can figure out how to use it.
Bryan
>I have not been able to get my new case fan running when it's plugged
>into the motherboard.
Try another motherboard fan header, and check the wire
positions on the connector to confirm they're in the right
positions - some aftermarket general purpose fans like you
link below may not have the same wire positions as a fan
meant for PC use, and some general purpose fans with 3 wires
have a rotor lock or speed control wire for the 3rd wire
instead of an RPM feedback. When in doubt try to find the
fan spec on the manufacture's website, often a code in the
fan model # at the end signifies which option the fan has.
>So I'm going to try connecting it to the power
>supply with an adatper. Just one question: Once I've connect the fan
>to the power supply, is it still possible to plug that white "signal"
>wire into the motherboard? (for monitoring the fan speed).
Yes, "if" the 3rd wire is for RPM function you can plug it
into the motherboard fan header, (assuming that fan header
works but it is curious it didn't power the fan, I would
take a multimeter and measure it's output, AND check the
bios for a fan thermal control setting which might've caused
the fan header to not supply enough power), providing it is
an RPM signal lead and the fan's ground lead is plugged into
the PSU ground (which it would be normally, unless you did
somthing odd like wired the positive lead to 12V and
negative lead to 5V to attain 7V operation in which case the
RPM lead would not work properly).
>Or will
>this damage the board? Sorry if it seems like a stupid question. I'm
>still fairly new at this.
No it shouldn't damage the board, many higher powered fans
were set up this way.
If you dont have the fan yet I suggest getting something
else instead, that is only moderate quality fan and it will
be pretty loud at full (12V) power. I can't imagine anyone
wanting that in their case unless the system were extremely
overclocked and in a very hot environment. Assuming you
need a 92mm dia. fan which that one is (unfortunately MPJA
always converts to english inch measurement even though the
manufacturer considers it a metric fan that's 92mm x 25.4mm)
>Someone suggested I connect the fan to the power supply instead of the
>motherboard (which I haven't done yet). But I figured I it DOES work,
>it couldn't hurt to try plugging just the signal wire in...could it?
>Bryan
That'll be fine, even if it doesn't work, but it would be
rare for everything on a board to work except for the one
fan header right before you try to use it, so I would
investigate more why it's not working.
Totalrod2@aol.com wrote:
> I have not been able to get my new case fan running when it's plugged
> into the motherboard. So I'm going to try connecting it to the power
> supply with an adatper. Just one question: Once I've connect the fan
> to the power supply, is it still possible to plug that white "signal"
> wire into the motherboard? (for monitoring the fan speed). Or will
> this damage the board? Sorry if it seems like a stupid question. I'm
> still fairly new at this.
> Bryan
I think case fans should be 120 volts AC and should come on when the PS
comes on. No sense to drag down a filtered DC supply running fans. I
have a 120v fan in my case and it works great. They DO make 120 volt
muffin fans.
On Sat, 23 Feb 2008 17:40:14 -0500, "Blattus Slafaly £ ¥
0/00 " <boobooililililil@roadrunner.com> wrote:
>Totalrod2@aol.com wrote:
>> I have not been able to get my new case fan running when it's plugged
>> into the motherboard. So I'm going to try connecting it to the power
>> supply with an adatper. Just one question: Once I've connect the fan
>> to the power supply, is it still possible to plug that white "signal"
>> wire into the motherboard? (for monitoring the fan speed). Or will
>> this damage the board? Sorry if it seems like a stupid question. I'm
>> still fairly new at this.
>> Bryan
>
>I think case fans should be 120 volts AC and should come on when the PS
>comes on. No sense to drag down a filtered DC supply running fans. I
>have a 120v fan in my case and it works great. They DO make 120 volt
>muffin fans.
.... That're incredibly lound and an unnecessarily complex
wirin job to be safe. A whole modern high-end system
consuming 300W can be effective cooled with 12W of fan
power, the "drag down" of DC fans is a minimal load.
********UPDATE**********
I got the fan working by connecting it to the power supply. No luck
with that white wire though. I think Kony is right. That white wire
performs some other function, NOT a signal for the rpm. Oh well, the
fan is actually pretty quiet, so I'll keep it in there seeing as it
works fine. My CPU is an AMD 5600+ (2.8 Ghz). I was thinking of
overclocking to 3.0Ghz (being conservative). I know, I should've
bought the AMD 6000+. But at the time I didn't think this motherboard
could handle it. From what I've read, I was wrong again. Thanks again
to everyone for helping.
Bryan
Totalrod2@aol.com wrote:
> ********UPDATE**********
> I got the fan working by connecting it to the power supply. No luck
> with that white wire though. I think Kony is right. That white wire
> performs some other function, NOT a signal for the rpm. Oh well, the
> fan is actually pretty quiet, so I'll keep it in there seeing as it
> works fine. My CPU is an AMD 5600+ (2.8 Ghz). I was thinking of
> overclocking to 3.0Ghz (being conservative). I know, I should've
> bought the AMD 6000+. But at the time I didn't think this motherboard
> could handle it. From what I've read, I was wrong again. Thanks again
> to everyone for helping.
> Bryan
Fans come with different options for a third wire. For example, some
equipment uses a "locked rotor" signal. That one doesn't pulse. The
locked rotor only changes state, when the fan controller detects that
the fan blade has dropped below a certain RPM level. So not every
fan you find, with three wires, has RPM on the third wire.
Cooling fan (revisited) 
7/8
Linear Mode
