What is the startup voltage of your Nexus\D12-SL?
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What is the startup voltage of your Nexus\D12-SL?
I'm curious. I see people on the forum running Nexus fans at 5V, so naturally assumed that Yate Loons which is the source for Nexus fans should at least start at 5V, maybe even lower reading that Nexus simply uses inline resistor to bring the voltage down. However, none of my Yate Loons start at 5V. In fact they start reliably only at 7V, at 6V they do start, but take 5-7 seconds to spin up to 'full' speed.
So how do people run their fans at 5V? Do they spin them up at 12V and then bring them down to 5V? Do they use speedfan to start fans at 12V and then frop RPMs once speedfan loads? Or do they use an equivalent hardware solution?
Note: I've included the poll for both fans, YL and Nexus. Please vote accordingly. If you have both pick either one, but later in the thread please post lowest start up voltage for both. Since fans typically have harder time starting in horizontal position, please post results for vertical fan position.
So how do people run their fans at 5V? Do they spin them up at 12V and then bring them down to 5V? Do they use speedfan to start fans at 12V and then frop RPMs once speedfan loads? Or do they use an equivalent hardware solution?
Note: I've included the poll for both fans, YL and Nexus. Please vote accordingly. If you have both pick either one, but later in the thread please post lowest start up voltage for both. Since fans typically have harder time starting in horizontal position, please post results for vertical fan position.
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My nexus fans start at 5V most of the time. So to be absolutely sure they start, I have two of them running in series on 12V (=6V each). And another system gives a 12V startup boost before it slows it down to 30% PWM.
People writing that Nexus fans are YL fans with a resistor added have too much imagination. It does not make any economical sense for YL to produce a slower moving fan that way. Just putting a slower motor in it will be cheaper.
People writing that Nexus fans are YL fans with a resistor added have too much imagination. It does not make any economical sense for YL to produce a slower moving fan that way. Just putting a slower motor in it will be cheaper.
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Well, I don't know if it's true but I think adding a simple resistor would be cheaper since it only costs 10cents while on the other hand building a slower motor will require changing your manufacturing facilities/process. Doing something like that does not make sense for a limited production oriented at a very small niche like us.Tibors wrote:People writing that Nexus fans are YL fans with a resistor added have too much imagination. It does not make any economical sense for YL to produce a slower moving fan that way. Just putting a slower motor in it will be cheaper.
Well, does anyone knows for sure if nexus uses slower motor or simple inline resistor? Anyone cares to open up his nexus for the sake of public knowledge?
That's wierd. Which YL's do you have? D12SL-12? I've got 5 D12SL-12's and they all start at 5V (sometimes lower, but not reliably).none of my Yate Loons start at 5V.
I remember discussing the Nexus top speed thing on here a while back, someone said they just changed the IC to limit the top speed, like a rev limiter on a car.
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For adding a resistor they have to change the manufacturing process too. Specifically they need to redesign the PCB to which everything connects. You can't just bungle a resistor on a wire between all those moving parts.JazzJackRabbit wrote:Well, I don't know if it's true but I think adding a simple resistor would be cheaper since it only costs 10cents while on the other hand building a slower motor will require changing your manufacturing facilities/process.
Yate loon makes a lot of different fans they all call D12SL-12. This results in that type number actually not meaning a whole lot. Certainly not as much as some people see in it.
That is certainly not the way it works. The speed starts to go down as soon as you drop the voltage only a tiny bit. So there is not "unnatural" cap.jaganath wrote:I remember discussing the Nexus top speed thing on here a while back, someone said they just changed the IC to limit the top speed, like a rev limiter on a car.
Re: What is the startup voltage of your Nexus\D12-SL?
Nexus, 7v. It did not start having problems starting at 5v until about a month ago. I have not tried testing at 6v.
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You can adjust the controller IC on brushless fans to pulse the coils at a lower frequency resulting in a slower fan. I'd assume that's what they did. It's probably just a resistor change on the board which effectively costs nothing (other than having to do separate production runs).jaganath wrote:I remember discussing the Nexus top speed thing on here a while back, someone said they just changed the IC to limit the top speed, like a rev limiter on a car.
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