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Re: Afraid to ask; what causes ACC unit not to turn off
Posted by David Ingram (more from David Ingram) on Sat, 20 Aug 2005 18:36:27
In Reply to: Afraid to ask; what causes ACC unit not to turn off, BWD, Sat, 20 Aug 2005 04:23:30
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The fan is not intelligent -- you hook up 12v, and it runs at top speed until you take the 12v away. That's where the resistor comes in. Just as its name suggests, it provides resistance in the circuit to reduce the voltage to the motor, thus slowing it or stopping it according to your desires.
If there's excessive amperage to the motor, it'll overwhelm or at least overheat the resistor, and you won't be able to vary speeds or turn off the motor. In my experience, I've generally been able to reuse a resistor if I had on-all-the-time fan failure mode. I've not been so lucky if the resistor ultimately gets SO fried that it actually cuts the circuit, i.e., dead fan.
posted by 69.182.11...
Posts in this Thread:
- David Ingram: RE: ACC fan speed controller + blower mtr, john_, Thu, 18 Aug 2005 11:11:58
- Same problem... I think, '97 CS 160K (Blower 110K old), BWD, Thu, 18 Aug 2005 18:34:49
- Righto..., David Ingram, Fri, 19 Aug 2005 06:11:43
- Re: David Ingram: RE: ACC fan speed controller + blower mtr, Abusot, Thu, 18 Aug 2005 12:04:49
- Sounds like replace all to me...., David Ingram, Thu, 18 Aug 2005 12:04:43
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