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Why you should probably not buy a CLC cooler - Page 28

post #271 of 474
Quote:
Originally Posted by Carniflex View Post

Yes. And in the case of "pseudo" PWM header they provide 100% duty cycle on the control pin and modulate the actual fan speed by dragging the voltage on the power pin down. Like with a non-pwm 3 pin fan. Unless I have misunderstood something.
"100% duty cycle on control pin" is no regulation. 0% duty cycle is 100% regulation. At least that is my understanding of how 'PWM control' works.
When circuit is closed (goes to ground) there is power to fan.
Pin-4 circuit open 100% of the time means fan power (from pin-2) is running 100% of the time to fan..
Pin-4 circuit closed 100% of the time means fan power (from pin-2) is running 0% of the time to fan .. or whatever the default 12v pulse is when circuit is closed 100% of the time.
post #272 of 474
Quote:
Originally Posted by doyll View Post

But

If it were all this simple, how is the PWM circuitry in fan 'programmed' giving some fans different PWM 'signal' to RPM ratios?

Case in point example are Thermalright TY-147 and TY-147A fans. Same fans except for PWM circuitry / program. TY-147 is 500-1300rpm on same PWM control from motherboard / Aquaero 5 while TY-147A is 300-1300rpm
This is exactly what I don't understand - thank you all for the discussion thumb.gif
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post #273 of 474
Quote:
Originally Posted by claes View Post

This is exactly what I don't understand - thank you all for the discussion thumb.gif

Fun stuff smile.gif

Circuitry on the pwm device interprets the control signal and uses that to regulate the power driven to the fan's motor. There are lot's of variations on how to go about doing that, lots of details. How to interpret 0 duty cycle for example, it's never interpreted as completely "off" for fan pwm, but what level of not off does it mean? There's also how the power is driven to the motor, power delivering current is ultimately pulsed, but the shape of the pulse wave forms can be tweaked.

This coolermaster advertisement has as a simple diagram showing different pulse wave forms and bragging about how their driver makes things quiet.

http://www.coolermaster.com/cooling/case-fan/silencio-fp-120-pwm/

The hardness or softness of the pulse edges can indeed have a significant impact of motor noise, the clicking sounds. The vid below isn't from fan control but demonstrates the sort of impact that tinkering with the shape of pulse edges can have on stepper motors

https://www.youtube.com/watch?v=qRrJK5jTZSA

How pc fan's work tutorial, pre-requisite to understanding how the driver ic fits into things.

http://pcbheaven.com/wikipages/How_Brushless_Motors_Work/
http://pcbheaven.com/wikipages/How_PC_Fans_Work/


The spec sheet for a pwm controller driver ic, the sort of device that might be found on the pcb board of a pwm fan. See figure 13 for a diagram of what it does.

http://www.onsemi.com/pub_link/Collateral/ANDLV8860V-D.PDF
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post #274 of 474
Some good links thumb.gif
But I need a least 2 more cups of coffee before I begin understanding them. biggrin.gif
post #275 of 474
The thing that annoys me the most is how these garbage CLC things are so widely accepted - but god forbid someone tries to build a real loop using anything but DDC or D5 pumps and you guys tear them apart. Shame on you.
post #276 of 474
Quote:
Originally Posted by 8 Lug Mike View Post

The thing that annoys me the most is how these garbage CLC things are so widely accepted - but god forbid someone tries to build a real loop using anything but DDC or D5 pumps and you guys tear them apart. Shame on you.

someone hurt you? redface.gif
post #277 of 474
Quote:
Originally Posted by 8 Lug Mike View Post

The thing that annoys me the most is how these garbage CLC things are so widely accepted - but god forbid someone tries to build a real loop using anything but DDC or D5 pumps and you guys tear them apart. Shame on you.
No, shame on you for lumping everyone into one group. Seems the radical in your post is you not them. tongue.gif
post #278 of 474
Quote:
Originally Posted by 8 Lug Mike View Post

The thing that annoys me the most is how these garbage CLC things are so widely accepted - but god forbid someone tries to build a real loop using anything but DDC or D5 pumps and you guys tear them apart. Shame on you.

Umm who?


I still remember heater cores and pond pumps
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post #279 of 474
Quote:
Originally Posted by 8 Lug Mike View Post

The thing that annoys me the most is how these garbage CLC things are so widely accepted - but god forbid someone tries to build a real loop using anything but DDC or D5 pumps and you guys tear them apart. Shame on you.

Are you referring to people trying to do something nonsensical like expand a Raijintek Triton pump to include three GPU blocks (which, yes, I would tear you apart for), or use a small Jingway or the like? There are a lot of good small pumps out there now that are not DDC or D5.
post #280 of 474
Just saw this on the header to the Water Cooling forum:



biggrin.gif

However, it's not what it appears. Fans were just leaking oil. Bad leaky fans. Or good fans behaving badly. Or just prank fans.

Must be noted - not seen this message title in the Air Cooling Forum: Why are my fans covered in air? tongue.gif
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