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SOLVED! PWM question. Fans don't throttle down. - Page 3

post #21 of 42
Thread Starter 
psyclum yes now looking back I would have chosen the Rheostat 6 long before this. It was recommended to me before I placed my order that I do this with two fp5s. I was actually considering ordering sunbeams rheostat now even with my pwm fans lol. Everyplace is out of stock on the 5.25 model atm. Actually with it I could probably control the speed of my pump with it also since its nominal draw is 24w and rheostat is 30w per channel. and one channel would be plenty for all the fans on my rad. To answer the distance question its next to the PC at the moment and the extension is about 5 feet but plan on moving it outdoors next winter for some sub zero cooling if I am ambitious enough.
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post #22 of 42
Quote:
Originally Posted by ehume View Post

Quote:
Originally Posted by doyll View Post

Quote:
Originally Posted by ehume View Post

I've been looking for those in the US and can't find any.


Out of stock here at moment, but could ask when they will be back in stock.
http://www.xoxide.com/gelid-pwm1to4.html


Could buy here on UK ebay for £4.95 and mail over to you for about £3.00 so £8.00 which is about $13.00
Thanks for the thought. I'm good for myself, but the question of what to buy comes up frequently. Having a 4-way means I can refer people to 3-way, 4-way and 5-way splitters.

Haha. +5 Rep.
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post #23 of 42
Have done some testing an find the PWM adapter will not reduce 3pin fan speed when hooked into PWM splitter harness.

This means I will use my TY-140 fans on cooler. Problem is the Phanteks fan clip adapters are too short to allow wire clips into them... TY-140 is .44mm thicker. frown.gif

Thought I as instructions somewhere of how to mount TY-140 but can't find it now.
post #24 of 42
Thread Starter 
try this link doyll
TY-140 mount
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post #25 of 42
Quote:
Originally Posted by Little_Timmy View Post

try this link doyll
TY-140 mount
Thanks Timmy. Should hav been clearer. Both Phanteks fans and TY-140 are 120mm mounts. Phanteks use a little pin through mount hole for spring clip to hook into. The Phanteks pins won't work in Ty-140 holes. frown.gif

But I came up with a work-a-round... small black pull-ties/wire-ties. The end is bigger then hole and tie is small enough to double over spring clip and back through hole. Pull up clipping off excess and Bob's you mother's brother.thumb.gif
Edited by doyll - 5/12/12 at 10:49am
post #26 of 42
Quote:
Originally Posted by doyll View Post

Have done some testing an find the PWM adapter will not reduce 3pin fan speed when hooked into PWM splitter harness.

A PWM splitter will only reduce the speed of PWM fans. 3-pin fans lack PWM circuitry. You can control them only with Voltage control.

 

3-pin fans are best used as case fans or in servers, where their speed will not vary. For varying speed, PWM fans work best.

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post #27 of 42
Quote:
Originally Posted by Little_Timmy View Post

psyclum yes now looking back I would have chosen the Rheostat 6 long before this. It was recommended to me before I placed my order that I do this with two fp5s. I was actually considering ordering sunbeams rheostat now even with my pwm fans lol. Everyplace is out of stock on the 5.25 model atm. Actually with it I could probably control the speed of my pump with it also since its nominal draw is 24w and rheostat is 30w per channel. and one channel would be plenty for all the fans on my rad. To answer the distance question its next to the PC at the moment and the extension is about 5 feet but plan on moving it outdoors next winter for some sub zero cooling if I am ambitious enough.

be VERY careful with sub zero testing biggrin.gif it doesn't take long for freezing liquid to break a rad and pump when they aren't designed for it smile.gif if you intend to experiment with sub zero conditions, you may want to just go to home depot and buy a 30 feet coil of copper pipe and do it that way. would be cheaper to replace and you wouldn't need any fans biggrin.gif

as far as the PWM wire... i'm guessing you might be able to try using CAT5E or CAT6 network cables.. the twisted pair (PWM signal and ground wire) may help carry the signal further w/o degradation? i don't know if it'll work. but it's worth a try IMO.
post #28 of 42
Quote:
Originally Posted by ehume View Post

A PWM splitter will only reduce the speed of PWM fans. 3-pin fans lack PWM circuitry. You can control them only with Voltage control.

3-pin fans are best used as case fans or in servers, where their speed will not vary. For varying speed, PWM fans work best.

Understood. My understanding is both 3 & 4 pin fans are fans with rpm monitor. PWM fans have an additional circuit that triggers to 12v power coming to fan when it's told to by PWM signal from motherboard/bios. PWM splitter takes rpm reading from one fan and sends PWM signal to PWM circuit in many fans. Phanteks PWM adapter appears to be their version of an external PWM circuit so I tested it to see. I assume the reason it isn't working on a PWM splitter has something to do with the rpm signal... but that is ass-suuming wink.gif

If it had worked, I wouldn't need another FY-140 fan. frown.gif
post #29 of 42
Quote:
Originally Posted by doyll View Post

Understood. My understanding is both 3 & 4 pin fans are fans with rpm monitor. PWM fans have an additional circuit that triggers to 12v power coming to fan when it's told to by PWM signal from motherboard/bios. PWM splitter takes rpm reading from one fan and sends PWM signal to PWM circuit in many fans. Phanteks PWM adapter appears to be their version of an external PWM circuit so I tested it to see. I assume the reason it isn't working on a PWM splitter has something to do with the rpm signal... but that is ass-suuming wink.gif
If it had worked, I wouldn't need another FY-140 fan. frown.gif

Nope, has nothing to do with RPM. PWM is signal driven, not voltage driven. The Phantek PWM cable takes the input PWM pulse signal sent by the MB fan header and converts it to equivalent Voltage the 3 pins fan(s) understand... ie; digital to analog converter. This will not work, and probably not intended or designed to use (in-line) with any other type of PWM splitter. Oh, and after reading Phanteks response to your inquiries, they did in fact explain it very well, but seem not to understand you fan config, or care that your are running that many fans off the CPU fan header biggrin.gif
Edited by gymenii - 5/12/12 at 3:07pm
post #30 of 42
Quote:
Originally Posted by gymenii View Post

Nope, has nothing to do with RPM. PWM is signal driven, not voltage driven. The Phantek PWM cable takes the input PWM pulse signal sent by the MB fan header and converts it to equivalent Voltage the 3 pins fan(s) understand... ie; digital to analog converter. This will not work, and probably not intended or designed to use (in-line) with any other type of PWM splitter. Oh, and after reading Phanteks response to your inquiries, they did in fact explain it very well, but seem not to understand you fan config, or care that your are running that many fans off the CPU fan header biggrin.gif

I could be wrong, but if i understand the PWM converter correctly, it does exactly what a PWM chip does in a PWM fan. it turns the fan on and off very quickly. it does not convert the PWM signal to analog and modulate the voltage (you would need a heatsink on a controller like that. the rheosmart6 is an example of converter that modulates the voltage) what it does is it feeds the full 12v to the fan at a very rapid on/off pulses. essentially it's a PWM chip but mounted externally instead of it being on the back of the motor.
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