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SOLVED! PWM question. Fans don't throttle down. - Page 4

post #31 of 42
Quote:
Originally Posted by psyclum View Post

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.

And that pulsing 12v current is the worst kind of fan controller IMO. It has the potential for making noise in the fan. I would prefer to see a converter that varies the Voltage.

 

But you can actually test your PWM converter if you like. Just hook up a multimeter and watch the Voltage.

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post #32 of 42
Quote:
Originally Posted by ehume View Post

And that pulsing 12v current is the worst kind of fan controller IMO. It has the potential for making noise in the fan. I would prefer to see a converter that varies the Voltage.

But you can actually test your PWM converter if you like. Just hook up a multimeter and watch the Voltage.

well that pulsing 12v current is exactly what happens in every PWM fan out there.... they simply took the chip out from behind the motor of a PWM fan and soldered a few wires onto it to make it an external unit.

as far as testing it, the pulsing would be too fast for a normal multimeter to read accurately. you'll need an oscilloscope to be able to see the pulsing of the currents.
post #33 of 42
Quote:
Originally Posted by psyclum View Post

Quote:
Originally Posted by ehume View Post

And that pulsing 12v current is the worst kind of fan controller IMO. It has the potential for making noise in the fan. I would prefer to see a converter that varies the Voltage.

But you can actually test your PWM converter if you like. Just hook up a multimeter and watch the Voltage.

well that pulsing 12v current is exactly what happens in every PWM fan out there.... they simply took the chip out from behind the motor of a PWM fan and soldered a few wires onto it to make it an external unit.

as far as testing it, the pulsing would be too fast for a normal multimeter to read accurately. you'll need an oscilloscope to be able to see the pulsing of the currents.

I had the Voltage in mind. You can measure that.

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post #34 of 42
well, i suppose it depends on the quality of the multimeter in question. there are some pretty high tech multimeter out there with graphing capabilities to measure at a much higher resolution then traditional multimeters. it might be able to graph out the voltage oscillation in a fine enough resolution to see the PWM pulsing.
post #35 of 42

I'm thinking more of my analog multimeter, decades old. If a device sends pulses of 12v current, my pre-digital multimeter will read 12v. If the device sends out some other Voltage, it will read that.

 

So I will be able to tell the difference between 12v pulses and reduced voltage. Just need to find the time.

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post #36 of 42
Thread Starter 
Update
So I ordered a Rheosmart fan controller and it still didn't work! One fan throttles down normally however the Rheosmart hooked to the R4E would not throttle under auto (PWM) settings. Otherwise in manual mode the Rheosmart changes the voltage just fine. I got my Fluke meter out and checked every wire for any errors and everything is fine. Next I flipped to voltage settings and checked the power wires (the two outside wires on your four pin PWM header and as it turns out the fan header varies the voltage of the power from 5vDC to 12vDC. Not sure if other motherboards work differently but that is how mine works.... and the cable is not made for this in addition to the Rheosmart fan controller. Also in order to eliminate another variable I used the same cable and hooked up a Cougar PWM fan. Also it seems worth mentioning that Sunbeamtech seems to have discontinued the Rheosmart series. I emailed Sunbeamtech and they did not respond after almost 2 weeks. Could be that possibly because of a difference in MB/fan PWM functions they are having to re-design the fan controllers? Maybe with this new info we can come to a new conclusion? Thanks guys
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post #37 of 42
Did you try other headers? Look for the page in the manual that covers all the fan headers.

A lot of boards have some 4-pin headers that don't actually use the PWM wire, and instead they do voltage regulation using the the 12v wire.
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post #38 of 42
Thread Starter 
Have used more than one but besides it does have flawless pwm function when not using an adapter... unrelated to splitting the signal up to much but related to getting the power directly from the psu best i can tell. Regardless of what the pwm wire and the rpm wire are doing my Voltmeter says it is varying the voltage to the to power leads when I check it.
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post #39 of 42
Thread Starter 
I tried 3 dif. fan headers and they all did the same thing but mm67 posted this

On my Rampage III Gene board all fan headers are also 4-pin headers but only cpu fan header actually outputs PWM signal and I know this for sure since I checked all headers with an oscilloscope. Other headers only do voltage control and in that case using a pwm splitter cable naturally doesn't work. On your board cpu and cpu opt fan headers probably are the ones that really use pwm control.

I tried it and it worked! I had been using my cpu fan header for my flow meter as a fail-safe incase my pump failed to start



biggrin.gif


Thanks a jizzilian!
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post #40 of 42
That's what I said. rolleyes.gif
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