Message text written by Ed Quinn
>Not being the master electrician and looking for a simple solution, I am
guessing the switch and light is on the hot side. What if the motor were
isolated from ground (which it may or may not be) and the switch was run on
the ground side, with the light downstream of the switch? The motor would
have a hot feed, but only grounded when the switch was on. The generation
by the fan would then be "cut off" by the switch and not illuminate the
phantom light.
<
Nope. Whenever the light is wired parallel to the fan motor and the fan is
being turned in the forward direction it will generate a voltage that will
light the light. It doesn't matter is the switch is high side, low side or
on both sides.
At one level the only difference between a motor and a generator is the
direction of power. With a motor you put in electrical power and get out
mechanical power. With a generator it is vice versa. You can hang a fan
out there with a light on it and it will light the light even if neither
side is connected to anything else. You can use it as a wind gauge.
One thing this does is verify that the fan is wired up correctly. If it
were wired up backwards (blowing air forward instead of rearward) the LED,
being a polarity sensitive device, would not light when proceeding down the
road - unless Peter can reverse very quickly, indeed. ;-)
Dave
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