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Author Topic: 120MM Case Fan -- 5v/12v?  (Read 1525 times)

USFJoseph

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120MM Case Fan -- 5v/12v?
« on: October 11, 2002, 03:25:00 AM »

I have a baybus that runs at 12v/5v -- I have all 80mm fans in my case and they all work fine at both voltages (slow & fast/normal).  However, I just purchased a 120MM intake fan & put it in the front of my case.  It runs fine at 12v fast/normal speed but when I try to run it slower at 5v it doesn't spin...just sits there.  Could it be that I have either the red or black wire in wrong?  or loose?  I had to extend both wires to reach the baybus & I just twisted & heatshrinked the extra wire onto it.  Any ideas what could be the problem or if this fan just won't be able to run at the lower speed.  Here is the url for the fan & baybus:

Baybus: http://www.frozencpu.com/cgi-bin/frozencpu/bus-11.html?id=JtaCSjeg

120MM Fan: http://www.1coolpc.com/case120ho.htm
The Sunon 90CFM model

Thanks!
Joseph
jgruber@tampabay.rr.com

P.S.  Not sure if this has anything to do with it but I have also noticed that my case fan at the top of the case sometimes reverses when turning the fan off using the baybus.  This fan is on the last switch.  It seems to happen when I turn on the first switch before turning off the last switch.  Strange but after switching on & off a couple of times I get it to stop.  I think it just might be a tornado type effect though...
 
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arcsylver

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120MM Case Fan -- 5v/12v?
« Reply #1 on: October 11, 2002, 06:45:00 AM »

You may have a fan that requires more current than your 5 volt supply can handle or it may require more than 5 volts to start the fan.

 Check the manufacturers specs to see what the starting voltages are for that fan as well as the amperage rating for it.

  As far as the backwards spinning fan goes. can you hear whether or not the fan is actually on? If it is on then something is definitely hooked up wrong somewhere. If it isn't then you idea of the air pressure in your case making it spin may be right on target.
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USFJoseph

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120MM Case Fan -- 5v/12v?
« Reply #2 on: October 11, 2002, 07:31:00 AM »

Model: KD1212PTB1-6A
Voltage VDC: 12
Bearing Style: 2b
Current AMP: 0.40
Input Watts: 4.8
Speed RPM: 3100
AirFlow CFM: 90
Pressure Inch-H2O: 0.28
Noise dBA: 44.5
Weight(g): 200


Found here: http://www.sunon.com.tw/product/traditional/t12025.htm

I don't know much about electronics so any ideas based on that if there is problem with the fan requiring too many volts?

Also, I do not hear the top fan so I think it is that tornado/wind tunnel effect thing.  I just have to turn it on/off/on/off (rocking it) till it stops.

Thanks,
Joseph
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arcsylver

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120MM Case Fan -- 5v/12v?
« Reply #3 on: October 11, 2002, 07:51:00 AM »

Well if I am reading the website correctly that fan should run ok with 5 volts. Although somewhat slowly.

 I have a similar setup with 5v/off/12v on my rig for an Enermax 120 and 2 enermax 80's.  The 120 spins slowly at the 5 volt setting but it does spin.  

  You might want to recheck the wiring on that fan for the 5 volt hookup. It may be crossed somehow or you may be pulling to much power off your 5 volt rail for it to work.

 Try unhooking some of your stuff a little at a time to see if the fan ever powers up at 5 volts. if it does you need a beefier power supply.
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USFJoseph

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120MM Case Fan -- 5v/12v?
« Reply #4 on: October 11, 2002, 09:08:00 AM »

Heh.  I was looking over the page for my BayBus & guess what it says?

-----
Pot located at top of unit (one for each switch) for adjusting the low voltage level. Adjusts from 7-9V (Higher voltages are required for fans such as sunons that won't run at 7volts)
-----

Well guess what I'm going to do when I get home from work? LOL

Thanks again!
Joseph
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spazzkid

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120MM Case Fan -- 5v/12v?
« Reply #5 on: October 14, 2002, 04:53:00 AM »

yes im using that kind of fanbus too. it has pots on it. you kud set the switch to a higher voltage say, 7-9v so the fan kud start working. had the same problem once, setting the pot to a higher volt solved my prob.
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