26 Jun
2012
26 Jun
'12
8:27 p.m.
black and red leads are labeled, white is not. Speed control? From large Sun servers OOPS!
Sorry. But can someone inform regardless, and what kind of signal/circuit is required to
control the speed, if thats the case. Cant successfully look it up now, its this stupid
phone.
26 Jun
26 Jun
8:42 p.m.
On 06/26/2012 11:27 PM, Chris Tofu wrote:
black and red leads are labeled, white is not. Speed
control? From
large Sun servers OOPS! Sorry. But can someone inform regardless, and
what kind of signal/circuit is required to control the speed, if
thats the case. Cant successfully look it up now, its this stupid
phone.
Put them BACK in the large Sun servers if they're anything remotely
recent.
It's almost definitely a tachometer lead. They're typically
controlled via PWM, with a closed-loop servo for speed control and
OS-accessible speed monitoring.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
11:35 p.m.
On 26 Jun 2012 at 20:27, Chris Tofu wrote:
black and red leads are labeled, white is not. Speed
control? From
large Sun servers OOPS! Sorry. But can someone inform regardless, and
what kind of signal/circuit is required to control the speed, if thats
the case. Cant successfully look it up now, its this stupid phone.
Consult the datasheet for the fan. Third leads are not always tach
sensors--and less likely to be so the further one goes back. During
the 1990s, one very common use was a "locked rotor alarm"--low while
the fan is spinning, but high when the fan is stuck. This was very
often the case when fan noise wasn't an issue, but an alarm was
desired should the fan fail.
I have several Panaflo fans with this 3-wire configuration. I've
read complaints from puzzled users of secondhand 3-wire fans
wondering why they get no tach reading when the fan is used in a
(semi) modern PC with speed control.
--Chuck
28 Jun
28 Jun
2:36 a.m.
On Tue, 26 Jun 2012, Chuck Guzis wrote:
On 26 Jun 2012 at 20:27, Chris Tofu wrote:
Not only that, but the 3rd wire can also sometimes be a 2-speed selection
signal.
Some of the many wiring options for ADDA fans can be found here:
http://www.addausa.com/options/options-index.html
black and red leads are labeled, white is not.
Speed control? From
large Sun servers OOPS! Sorry. But can someone inform regardless, and
what kind of signal/circuit is required to control the speed, if thats
the case. Cant successfully look it up now, its this stupid phone.
Consult the datasheet for the fan. Third leads are not always tach
sensors--and less likely to be so the further one goes back. During
the 1990s, one very common use was a "locked rotor alarm"--low while
the fan is spinning, but high when the fan is stuck. This was very
often the case when fan noise wasn't an issue, but an alarm was
desired should the fan fail.
I have several Panaflo fans with this 3-wire configuration. I've
read complaints from puzzled users of secondhand 3-wire fans
wondering why they get no tach reading when the fan is used in a
(semi) modern PC with speed control.
4565
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