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PWM controled pump and fans possible? - Page 3

post #21 of 26
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Now that I know how the PWM signal works, I'll probably just use a splitter and see how that goes. I'd rather not use the controller if I don't have to. I'll only be controlling the pump and three fans on pwm with power from the psu.

Thanks everybody for your help.
post #22 of 26
Quote:
Originally Posted by ghostrider85 View Post

You too are talking about different thing, you are using one fan and connected it to 2 different controller. The op wants to connect 2 unidentical devices into only one controller/header. Just as i said, it will work, but not properly

You misunderstood, we are talking about multiple devices sharing a common PWM signal and simply splitting it. It doesn't matter if it's the rheosmart or PWM fans. Here is how I have the rheosmart and 35X connected. The Rheosmart just happens to have a built in splitter. The PWM signal is split between the pump and rheosmart just like a pump and PWM fan:
sunbeam-9.jpg?w=614&h=629

Only difference is I didn't have PWM fans, so I used the rheosmart to make PWM fans out of ordinary 3pin fans.

The artic cooling F12 fans also work in a similar PWM splitting daisy chain.

You can not read RPM from more than one device, but PWM splitting works perfectly fine...try it you'll see..thumb.gif
Edited by Martinm210 - 1/30/12 at 7:41pm
    
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post #23 of 26
I did not know how pwm works until now so i was doubtful
I failed doh.gif
Edited by ghostrider85 - 1/30/12 at 7:49pm
post #24 of 26
Well I'm sure at some point the signal will be too weak to keep splitting, but it works for a few. I had heard someone say upwards of 8 devices, but I've never seen someone push it that far.

You are right though about the RPM signal. If you split and share two fan RPM wires together that will screw up the RPM reading. That's why the rheosmart has a separate cable that takes the fan RPM signal and sends it to another motherboard header for RPM reading only.

It's all good:thumb:
    
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post #25 of 26
I just wish they made the face of the rheosmart easier to mod like the rheobus. Rheosmart is a pain in the arse to mod.
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post #26 of 26
I have all 9 of my Akasa Viper case and radiator fans controlled by the PWM output from the CHA_FAN header on my motherboard.
I used a combination of the Akasa 3 way splitters, and a custom 4 way splitter box I made for the 4 fans on my removable side panel mount radiator.
Both of my MCP35x are also PWM controlled. For whatever reason Speedfan was not able to control the CPU_FAN header on my motherboard, so I made an adapter to use the PWM output, and RPM input, on my GTX470 video card, which Speedfan is able to control.

For the record, I've tried controlling both pumps and all 9 fans off one PWM signal, 11 total devices.
It worked fine off the signal from the motherboard and the signal from the video card.


A couple of things I learned from messing with my system.

You really don't need to vary the pump speed much, if at all. At most have a minimum setting for ultra quiet operation at idle and light use, and a faster setting for when the system is under load. For most loops, the maximum tangible cooling benefit can be had at less than full speed, especially if you run 2 of the suckers in series like I do. Running them at less than full speed is quieter, and "should" make them last longer.

For the fans, it is best to set them up so they speed up in steps as more cooling is needed, as having them follow a temperature curve leads to them constantly ramping up and down, which is seriously annoying.
I have mine set to run at their minimum speed when the CPU die(aka. tCase) temperature is <40ºC (idle and light use), then ramp up to a higher speed between 40 and 55ºC, and ramp up to 100% above that.
This gives a less annoying progression in fan speed as more cooling is needed.
I go off the CPU die(tCase) temperature because it fluctuates less, and is more relevant to the life of the CPU than core temperature, at least it is for Intel CPU's.

Ideally I'd like to control the fans based on water vs ambient temperature, but that would require an additional controller.

Obviously the temperature range, and fan speed, for each step is dependent on your hardware and installation.
Edited by Caleal - 1/30/12 at 10:34pm
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