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daisy chaining

post #1 of 5
Thread Starter 
Sorry if this is a noob question, I searched for a guide on daisy chaining on the forum and cant find anything...

I am considering getting some higher quality fans (delta or Sanyo Denki)...up to 9 (7 case, 2 on heat sink). I want to hook them up to a fan controller...Problem is most only have 4-6 hubs, and then I found out about daisy chaining. But I cant find a guide on how to do it anywhere.
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post #2 of 5
http://en.wikipedia.org/wiki/Series_and_parallel_circuits <-- Skim over this article

When you daisy chain multiple fans on one hub, you are powering your fans in series.
When you connect one fan per hub, you are powering your fans in parallel.

You might want to do some sort of series-parallel combination if you have 9 fans and the controller has 4-6 hubs.

When you daisy chain fans, the fan controller has to increase the power per hub. Most fan controllers have a maximum watts or amps per hub. I can help you calculate that.

Because you have a voltage drop in a series circuit, you have to be weary of making the daisy chain too long. What could happen if the daisy chain is too long is all the fans on the daisy chain should be the same speed, but actually the first fan is spinning twice as fast as the last fan.

Did i help you? Or did I just confuse you more?
Edited by crimsontears809739 - 3/16/11 at 8:37am
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by crimsontears809739;12753481 
http://en.wikipedia.org/wiki/Series_and_parallel_circuits <-- Skim over this article

When you daisy chain multiple fans on one hub, you are powering your fans in series.
When you connect one fan per hub, you are powering your fans in parallel.

You might want to do some sort of series-parallel combination if you have 9 fans and the controller has 4-6 hubs.

When you daisy chain fans, the fan controller has to increase the power per hub. Most fan controllers have a maximum watts or amps per hub. I can help you calculate that.

Because you have a voltage drop in a series circuit, you have to be weary of making the daisy chain too long. What could happen if the daisy chain is too long is all the fans on the daisy chain should be the same speed, but actually the first fan is spinning twice as fast as the last fan.

Did i help you? Or did I just confuse you more?

too long as in the actual length of the cable? or just too many daisy chains on one hub? I know a lot of fan controllers can handle up to 30W/channel, and delta/san ace have the specs on their website to calculate wattage/fan.

That being said I may just try to get fans i can tolerate at max speed and keep it simple
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post #4 of 5
Quote:
Originally Posted by crimsontears809739;12753481 
When you daisy chain multiple fans on one hub, you are powering your fans in series.

Wrong, when wiring multiple fans to a single fan control channel (or 12V molex) it is invariably done in parallel (exception would be 2 6V fans in series on a 12V supply).

The term daisy chaining is primarily used for data communication and simply means that device C is not directly connected to device A; but rather to device B, which in turn is connected to device A. An example of this is a flash drive connected to a USB hub rather than directly to the PC. In electrical wiring you see this in the sense that not all outlets are wired directly to a breaker, but rather a parallel string of outlets is connected to the breaker as this reduces the number of wires entering the breaker box and substantially decreases the amount of cable required to provide power to the outlets.

For wiring multiple standard (12V) case fans to a single fan control channel, you basically just have to make sure you don't exceed the power capabilities of the channel; since the fans are in parallel, you simply add up the power draw of all the fans connected to that channel. The fan controllers are typically rated in Wattage (W), while the fans themselves are rated based on their current draw in Amps at a certain voltage (allowing you to find the internal resistance); due to the nature of DC motors windings essentially being a resistive element, the current draw decreases with the voltage, so the max current draw is at the max voltage. The design power load for the fan is essentially the reference current times the voltage (P=V*I; P in watts, V in volts, and I in amps).
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post #5 of 5
Thanks for the posts. Helped me answer a question I had too smile.gif
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