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01-12-2011, 02:37 PM
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Join Date: Apr 2008
Location: Tennessee
Posts: 440
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wiring question
I'm hooking up two computer cooling fans to provide defrost air for the windscreen. It has three wires. Two are obvious but what is the third wire (yellow I think) for?? Thanks, Dan
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01-12-2011, 02:43 PM
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Join Date: Feb 2006
Location: San Diego, CA, U.S.A.
Posts: 770
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Quote:
Originally Posted by JDanno
I'm hooking up two computer cooling fans to provide defrost air for the windscreen. It has three wires. Two are obvious but what is the third wire (yellow I think) for?? Thanks, Dan
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The third wire is used for sensing fan speed. You can leave it unconnected. |
01-12-2011, 02:43 PM
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Join Date: Dec 2004
Location: Gold Hill, NC25
Posts: 2,399
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Yellow is speed sensor that goes to the motherboard if memory serves me. You can disregard it.
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Kahuna
6A, S8 ,
Gold Hill, NC25
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01-12-2011, 03:23 PM
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Join Date: Apr 2008
Location: Tennessee
Posts: 440
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Thanks!!!!
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01-12-2011, 03:27 PM
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Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
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On a DC powered fan...
...the third wire is used as a tach feed back to the fan controller to validate fan rotation.
On a PWM fan, you get fan power, fan gnd, and the third is pulse width modulation that defines the fan speed and also the feedback signal. This type of fan requires a dedicated fan controller chip or logic.
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01-12-2011, 04:41 PM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,964
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A timely post,,,,,,I just spent today installing my defroster fans in my -10. I am using one for each vent and also one for cooling the radio stack. These are light and the price is great: http://www.surpluscenter.com/item.as...tname=electric
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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01-12-2011, 05:51 PM
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Join Date: Feb 2005
Location: Minneapolis
Posts: 2,471
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