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Case fan slows down when case lights are dimmed

post #1 of 11
Thread Starter 
As the title says. I have noiseblocker fans and 12v led strips attached to a remote dimmer. When I put the leds on anything but 100%, the fans slow down. Does anyone have any idea how to stop this?

I don't want the leds constantly on 100% but do want to turn them full power when I want to

https://vimeo.com/178355316


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post #2 of 11
Unless there is another channel on that remote dimmer to set your fans on then I would recommend getting a separate fan controller and hooking them up to it. What's the model f the remote dimmer you're using?
post #3 of 11
Quote:
Originally Posted by robster84 View Post

As the title says. I have noiseblocker fans and 12v led strips attached to a remote dimmer. When I put the leds on anything but 100%, the fans slow down. Does anyone have any idea how to stop this?

I don't want the leds constantly on 100% but do want to turn them full power when I want to

https://vimeo.com/178355316

Are you sure the fan is slowing down? Because the noise doesn't change at all?

It could just look like its spinning slower because its a pwm dimmer.
post #4 of 11
Thread Starter 
Its definitely slowing down. The dimmer is not on the fans so they should not alter
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by Fateful_Ikkou View Post

Unless there is another channel on that remote dimmer to set your fans on then I would recommend getting a separate fan controller and hooking them up to it. What's the model f the remote dimmer you're using?

The fans are connected to the motherboard. Its a cheap inline dimmer so i suspect it is interference
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post #6 of 11
Quote:
Originally Posted by robster84 View Post

Its definitely slowing down. The dimmer is not on the fans so they should not alter

Hmm, Perhaps there's too much resistance on one of your PSU's particular 12v rails? I ran into a similar issue once before and simply moved my fan controller to another rail to solve the issue.
Quote:
Originally Posted by robster84 View Post

The fans are connected to the motherboard. Its a cheap inline dimmer so i suspect it is interference

Oh now that's odd. What is the model of the PSU you are using? headscratch.gif
post #7 of 11
Thread Starter 
I will give it a try later on. Thanks
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post #8 of 11
Quote:
Originally Posted by robster84 View Post

The fans are connected to the motherboard. Its a cheap inline dimmer so i suspect it is interference

Are you 100% sure its slowing down? Because its virtually impossible that your dimmer could be interfering with your motherboards fan speed control.

Those cheap dimmers use slow PWM in other words, it makes your leds flash to make less light, causing a kind of strobe effect, so it perfectly normal that it makes your fan appear to spin slower.

Edit: Also, looking at the video again, the speed change appears way too quickly, eLoops don't change speed that fast. I'm quite certain its the strobing light that just creating the visual effect of them running slower.
Edited by Gilles3000 - 8/10/16 at 1:08pm
post #9 of 11
Quote:
Originally Posted by Gilles3000 View Post

Are you 100% sure its slowing down? Because its virtually impossible that your dimmer could be interfering with your motherboards fan speed control.

Those cheap dimmers use slow PWM in other words, it makes your leds flash to make less light, causing a kind of strobe effect, so it perfectly normal that it makes your fan appear to spin slower.

Edit: Also, looking at the video again, the speed change appears way too quickly, eLoops don't change speed that fast. I'm quite certain its the strobing light that just creating the visual effect of them running slower.

Not that I'm an expert by any means but I definitely think Giilles3000 is right here. Unless the fans run through the dimmer, or the dimmer somehow runs through the fan lines, there should be no adverse affects from changing the dimmer on the fans. If the fans are plugged into the motherboard then the mobo should be controlling the rpm of the fan.

So a good test would be to open your BIOS, or a program like HWmonitor, that monitors the rpm of your fans, then turn the dimmer up and down to see if it actually has any affect on the fan RPMs at all. If the rpm of the fans change dramatically (+/- 100 rpm) then there is some stranger issue at hand here. But if the RPMs don't change then you just have a really cool physics experiment in your pc build.

It's literally the same thing we do in class to check the rotation of airplane propellers, or mechanics use to check timing belts so I'd say its pretty awesome and could make for an awesome story until upgrading the dimmer to a higher frequency PWM.
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post #10 of 11
Thread Starter 
You may well be right. There is not any significant change in rpm when i look with speedfan. Well that seems like its the answer but still annoying thumb.gif

Thanks a lot for the advice
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