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PWM help

post #1 of 15
Thread Starter 
I put together a MO-Ra3 with 9 fans and built a fan header/molex extension to get the power to my Rad. I have a program called "fan xpert" on my motherboard and when I turn the appropriate fan down it does not show a lower rpm and the fans still sound like a whirlwind and the noise level never drops. I have watched to see if by chance one fan is slowing down and not the rest and it doesn't appear that way. My question is will this type of a connector (since I used this as a template) circumvent the pwm function?

601

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I tried the factory adapter from the link above on one fan and the fan will not throttle down. Connect this same fan directly to a fan header or my extension and it functions properly lowering from 1350 RPM to 600. My conclusion is that PWM only works when the power is taken from the header on the board? This makes no sense to me since there are all types of adapters like this sold.... people using PWM pumps on these adapters an everything? Please let me know any thing I could do different to get the PWM function working. My fans are rated at .21Amps each and motherboard headers are rated at 1amp (12watts) each.
Edited by Little_Timmy - 5/10/12 at 10:35am
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post #2 of 15
Thread Starter 
Moved this thread here
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post #3 of 15
Try it with a single fan connected to the motherboard first. If that works, then it's either the connector or there are just too many PWM lines connected. There is probably a PWM daisy chain limit of sorts, but I haven't seen anyone show that. I would assume it's probably a setting in the motherboard, or the wrong PWM header, etc, but I would do some trial and error with a sing 4 pin fan connected to the appropriate motherboard PWM header and see if you can get it to respond that way first.
    
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post #4 of 15
Thread Starter 
I have done all that you mentioned. I have found that on my mb the two power wires on my fan headers is variable DCvoltage in addition to the function of the PWM wire and the rpm wire.

So I ordered a Rheosmart fan controller and it still didn't work! One fan (without the cable that jumps power from the molex) 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 with the same results. 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?
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post #5 of 15
If fan header is varying it's voltage then it is not outputting PWM control. Which motherboard header are you trying to use, cpu fan header or something else ?
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post #6 of 15
I use Fan Xpert to control my pumps and I had to use the calibrate option first to get them synchronised with the speed control. One thing that might confuse it is if there is a tacho signal from every fan. I had to split the tacho wire on my pumps so that one was using the PWM header and the other went to a normal fan header. A benefit of that was that I can monitor the speed of each pump.
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post #7 of 15
someone correct me if im wrong, because im looking to do something similar, but i do belive that a molex connector does not contain the controlling features that a PWM connector has. I think its just feeding constant voltage to your fans. just a theory.
post #8 of 15
The 4 pin Molex type connector supplies the power and a control wire on the PWM header sends the signal to control the speed while the tacho wire reports the rpm of the connected device.
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post #9 of 15
Quote:
Originally Posted by Big Elf View Post

The 4 pin Molex type connector supplies the power and a control wire on the PWM header sends the signal to control the speed while the tacho wire reports the rpm of the connected device.

ty
post #10 of 15
Thread Starter 
Currently using Chas fan 1. It is variable since I can hook a single fan up to it and it works flawlessly.
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