Re: smart fans
On 8/22/21 1:39 AM, Emanuel Berg wrote:
4-pin fans wouldn't be possible because of the motherboard
sockets, I think, which are also 3-pin.
The motherboard user's manual says all of the fan connectors are 4-pin.
On 8/22/21 6:03 AM, Polyna-Maude Racicot-Summerside wrote:
> Like I already wrote, modifying voltage doesn't change speed of a motor
> (fan).
STFW here are some useful wiring diagrams for x86 ATX PC computer power
supplies and fans:
https://www.smpspowersupply.com/connectors-pinouts.html
https://landing.coolermaster.com/faq/3-pin-and-4-pin-fan-wire-diagrams/
Changing the supply voltage of a old-school 2-wire fan will change the
speed. These typically have 4-pin power supply Molex connectors and/or
2-pin 0.1" general electronics connectors. I connect these to Molex
connectors or manual speed controllers, paying attention to alignment/
polarity.
Changing the supply voltage of a 3-pin fan, where the 3rd wire is
tachometer feedback, will change the speed. I connect these to
motherboard 3-pin and 4-pin fan connectors, paying attention to the
alignment tab.
Changing the supply voltage of a 4-pin fan, where the 3rd wire is
tachometer feedback and the 4th wire is PWM speed control, may change
the fan speed, may cause the electronics onboard the fan assembly to
malfunction or fail, and/or may cause the electronics feeding the fan to
malfunction or fail. I connect these to motherboard 4-pin fan
connectors, paying attention to the alignment tab.
Be careful when making connections. I once mis-aligned a 2.5" IDE HDD
40-pin power/signal adapter cable to a 2.5" IDE HDD and was off by one
row. When I energized the power supply, the result was a short-circuit,
smoked insulation, and permanently damaged hardware!
David
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