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PC Fan wiring Q
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Rick Hughes
Jun 16, 2014, 9:11:27 AM6/16/14
to
Going to be using a PC fan on a non-PC project. (details in earlier thread)
I bought (and also recommended here) the ARCTIC F12 PRO TC
It arrived ... and as well as standard 3 pin lead which is normally +ve,
-ve & tacho
It has a separate lead with temp sensor ..... I do not wish the fan to
control itself I want to control it from external unit .... anybody know
how to disable this tempo sense function.
--
UK SelfBuild: http://uk.groups.yahoo.com/group/UK_Selfbuild/
I bought (and also recommended here) the ARCTIC F12 PRO TC
It arrived ... and as well as standard 3 pin lead which is normally +ve,
-ve & tacho
It has a separate lead with temp sensor ..... I do not wish the fan to
control itself I want to control it from external unit .... anybody know
how to disable this tempo sense function.
--
UK SelfBuild: http://uk.groups.yahoo.com/group/UK_Selfbuild/
Toby
Jun 16, 2014, 10:05:09 AM6/16/14
to
On 16/06/2014 14:11, Rick Hughes wrote:
> Going to be using a PC fan on a non-PC project. (details in earlier
> thread)
>
> I bought (and also recommended here) the ARCTIC F12 PRO TC
>
> It arrived ... and as well as standard 3 pin lead which is normally +ve,
> -ve & tacho
> It has a separate lead with temp sensor ..... I do not wish the fan to
> control itself I want to control it from external unit .... anybody know
> how to disable this tempo sense function.
>
>
I think these are usually just a thermistor, so if you short it out, it
> Going to be using a PC fan on a non-PC project. (details in earlier
> thread)
>
> I bought (and also recommended here) the ARCTIC F12 PRO TC
>
> It arrived ... and as well as standard 3 pin lead which is normally +ve,
> -ve & tacho
> It has a separate lead with temp sensor ..... I do not wish the fan to
> control itself I want to control it from external unit .... anybody know
> how to disable this tempo sense function.
>
>
should run at full speed.
If not, leave it open circuit ;)
--
Toby...
Remove your pants to reply
Andrew Gabriel
Jun 16, 2014, 10:30:53 AM6/16/14
to
In article <lnmthe$rk7$1...@dont-email.me>,
Are you sure?
4-wire fans IME are power (two), tacho output, and speed control input
(usually PWM nowadays). The PWM signal input is separated from the power
so the tacho output still works at low mark-space PWM ratios. Also, the
fan uses the PWM input as a guide only, and won't drop below min
sustainable fan speed, and will boost the fan to start it even if
initial low mark-space PWM ratio at powerup.
(I was playing with some large Sanyo Denki ones, pulled from an E4500 Sun
server, a couple of weeks ago.)
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
4-wire fans IME are power (two), tacho output, and speed control input
(usually PWM nowadays). The PWM signal input is separated from the power
so the tacho output still works at low mark-space PWM ratios. Also, the
fan uses the PWM input as a guide only, and won't drop below min
sustainable fan speed, and will boost the fan to start it even if
initial low mark-space PWM ratio at powerup.
(I was playing with some large Sanyo Denki ones, pulled from an E4500 Sun
server, a couple of weeks ago.)
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
Rick Hughes
Jun 16, 2014, 11:21:51 AM6/16/14
to
On 16/06/2014 15:30, Andrew Gabriel wrote:
)
>
> Are you sure?
> 4-wire fans IME are power (two), tacho output, and speed control input
> (usually PWM nowadays). The PWM signal input is separated from the power
> so the tacho output still works at low mark-space PWM ratios. Also, the
> fan uses the PWM input as a guide only, and won't drop below min
> sustainable fan speed, and will boost the fan to start it even if
> initial low mark-space PWM ratio at powerup.
>
> (I was playing with some large Sanyo Denki ones, pulled from an E4500 Sun
> server, a couple of weeks ago.)
>
This is not a 4-wire fan.
)
>
> Are you sure?
> 4-wire fans IME are power (two), tacho output, and speed control input
> (usually PWM nowadays). The PWM signal input is separated from the power
> so the tacho output still works at low mark-space PWM ratios. Also, the
> fan uses the PWM input as a guide only, and won't drop below min
> sustainable fan speed, and will boost the fan to start it even if
> initial low mark-space PWM ratio at powerup.
>
> (I was playing with some large Sanyo Denki ones, pulled from an E4500 Sun
> server, a couple of weeks ago.)
>
This is a 3 wire fan (3 wires to standard 3 pin fan plug) there is a
totally separate cable which terminates on a thermistor.
i.e see link: http://www.arctic.ac/eu_en/arctic-f12-tc.html
seems what I should have got was F12 'NOT' F12 TC
Rick Hughes
Jun 16, 2014, 11:21:56 AM6/16/14
to
Rick Hughes
Jun 16, 2014, 11:28:29 AM6/16/14
to
http://www.arctic.ac/eu_en/arctic-f12-pro.html
Maybe I just need go buy another fan. (annoyed at my mistake)
Dave Liquorice
Jun 16, 2014, 12:02:11 PM6/16/14
to
On Mon, 16 Jun 2014 15:05:09 +0100, Toby wrote:
> I think these are usually just a thermistor, so if you short it out, it
> should run at full speed. If not, leave it open circuit ;)
Or the middle ground replace it with a fixed value resistor which
> I think these are usually just a thermistor, so if you short it out, it
> should run at full speed. If not, leave it open circuit ;)
should be far more stable than a thermistor in relation to
temperature changes. Value? Measure the resistance of the thermister
when it "hot" say 40 or 50 C.
--
Cheers
Dave.
Bob Minchin
Jun 16, 2014, 3:46:06 PM6/16/14
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