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02-17-2008, 04:32 PM
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Member
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Join Date: Jan 2008
Zone: 6b
Location: Hamilton, Ontario
Posts: 36
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fan hook up
I found this 12 v dc fan in a surplus store ( cheap)
it has 3 wires red, black and white
I would think black is " + " and the red " - " the white ??
do I have it right?
I know this is not an electrical forum.... but you guys have been building these great setups... somebody should know.
I e-mailed the company and they gave one crazy answer
quote"
Third wire lead=Sensor
Sensor : rpm, alarm, lock rotor...
If you don't have any reading/monitoring for the fan, the third wire can be leave alone. " end quote  
Cheers
Peter |
02-17-2008, 04:48 PM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,831
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The PC fans I have only have a red and a black lead - no third wire. So I think you can ognore the white. Now, being a DC fan, if it is hooked up one way, fan will push, but if hooked up opposite it will pull. Should be easy to figure out.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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02-17-2008, 04:54 PM
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Super Moderator
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Is one a ground ?
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Dorothy
"Nothing beats the orchid -- as an offering of love"
- paraphrasing Marlowe Hood from 'Orchid Fossil Quells Evolutionary Quarrel'
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02-17-2008, 05:10 PM
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Roots are good
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Join Date: Sep 2006
Zone: 5a
Location: Cadillac, Michigan, USA
Posts: 7,831
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Quote:
Originally Posted by Dorothy
Is one a ground ? |
With PC fans (DC) one is hot, one is ground, yes. The third is for logic like speed control, etc.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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02-17-2008, 05:31 PM
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Member
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Join Date: Jan 2008
Zone: 6b
Location: Hamilton, Ontario
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so the white would be ground or neg?
the black pos and the red to add some speed ?
I know I can try but I rather know and not burn the thing out before I use it... The surplus store has a whole box ... but ...don't like to buy them all...lol
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02-17-2008, 05:32 PM
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Member
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Join Date: Jan 2008
Zone: 6b
Location: Hamilton, Ontario
Posts: 36
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forgot but I am sure you have it right I think its a pc fan
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02-17-2008, 06:00 PM
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Join Date: Jan 2008
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Location: Waitsburg, Washington
Age: 18
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From what little I know about electronics, the black wire is negative, the red wire is positive (hot) and the white is neutral. The negative is the grounding wire, don't hold it while trying to figure out how to wire in the positive, or you become the ground and get the the shock of your life (120 volts). If your fan is a PC fan you should be able to power it with 12 volts, like a car battery. You can use a small 9 volt battery ot touch the leads to the terminals to figure out which one is which. With nine volts it will not run as fast or as powerful. It also has to deal with amperage, but you'll get the main idea by just trying it out.
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Jordan Ely
Last edited by Ely : 02-17-2008 at 06:01 PM.
Reason: done fergot a verb
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02-17-2008, 06:18 PM
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Member
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Join Date: Jan 2008
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Location: Hamilton, Ontario
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good idea... and no burning it out right away....thanks
peter
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02-19-2008, 11:23 PM
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Senior Member
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Join Date: Feb 2007
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Location: South Florida
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Hi Peter, If your fan is 12 volt dc the red and black wire are the power leads and can be reversed ie if the red lead is on the + and the black on the - the fan will run clockwise and reversed the leads and the fan will run counter clockwise. The white wire sends a signal back to the computer so it can tell if the fan is running or how fast it is running (rpm). Not all computers have that capibility. You can get a inexpensive transformer the puts out 12 volts dc to power the fan without having a battery
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Dave
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