# Fan wires help! which is which yellow, blue , red , & black

Discussion in 'The Projects Forum' started by joulian, Dec 19, 2009.

Aug 27, 2009
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2. ### studiot AAC Fanatic!

Nov 9, 2007
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521
What did you intend to use it for? You probably don't need the other connections, they will be for speed control via sensors.

Last edited: Dec 20, 2009
3. ### joulian Thread Starter Active Member

Aug 27, 2009
53
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Well i put it on a 110v to 24v transformer .40amps
but its not turning on fan when i connect the +/-

I noticed the fan uses 24-60v
and has a .48amps rating. But I figured that was using its max volts of say 60.

Hmmm

I was thinking it might be some speed control also....
but what with a rheostat?

4. ### joulian Thread Starter Active Member

Aug 27, 2009
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Solar furnace. Blow hot air from it into garage.

5. ### Paragon Member

Dec 8, 2009
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Is that a 24V AC or DC output transformer? The fan runs off DC.

6. ### studiot AAC Fanatic!

Nov 9, 2007
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521
Doesn't your fan spec sheet say DC?

Apr 5, 2008
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8. ### joulian Thread Starter Active Member

Aug 27, 2009
53
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Yes AC to DC

I don't understand why its not turning on.

I connected the +/- to the transformer and even touched the blue and yellow to one another ( if it is a sort of switch it should have worked).

9. ### eng1ne Member

Dec 4, 2009
97
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The input power = 23.52 W @ 48 V (the rated input).

By P = V.I, I = P/V = 23.52/48 = 0.49 A

However, at 24 V, I = 23.52/24 = 0.9 A

And at 60 V, I = 23.52/60 = 0.39 A

The quoted values are at rated input voltage, as is quoted on the fourth note right on the bottom of the page.

10. ### hgmjr Retired Moderator

Jan 28, 2005
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Joulian,

As others have mentioned, I believe you have a 48V fan. I think you will need to apply 48 volts to get the fan operating. Once it is operating, I think you will find that the yellow and blue wires are the collector and the emitter of a sensor transistor. This transistor is there to permit the monitoring of the motor's speed.

hgmjr

11. ### joulian Thread Starter Active Member

Aug 27, 2009
53
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Ahhhh man, I was afraid this was going to be the reason. I asked the guy at the store if it would work. He said yes, i bought it from surpluscenter.com.

Ok I just looked for a 48v transformer on that site above.
Any suggestions? on what to do. I am going over my budget on this entire project.

Aug 27, 2009
53
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13. ### hgmjr Retired Moderator

Jan 28, 2005
9,030
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This fan should work for you. Are you going to need to control the speed?

hgmjr

14. ### eng1ne Member

Dec 4, 2009
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hgmjr, the fan that you have suggested requires 1.1 A @ 24 V dc; some 0.6 A over joulian's power supply.

15. ### hgmjr Retired Moderator

Jan 28, 2005
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Eng1ne,

Good point. It seems that in order to use the 24 volt fan mentioned in the earlier post, a transformer with a higher power rating will need to be acquired.

hgmjr

16. ### joulian Thread Starter Active Member

Aug 27, 2009
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hmmmm man.
Any site suggestions like the one i used that would have a good deal on one?