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1. 08:14 AM - Re: Re: Alternator problem? (Robert L. Nuckolls, III)
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| Subject: | Re: Alternator problem? |
>In doing this, wouldn=99t one be just moving the
>problems that have been discussed in great
>detail, of why we should not use internally
>regulated alternators.=C2 The internal regulators
>do not react kindly to turning the alternator on and off.
It's not a matter of 'not taking kindly' . . . its the
conditions surrounding a failure modes. Off the shelf, internally
regulated alternators have a runaway failure mode wherein the
alternator CANNOT be shut off from outside. This is why
some folks remove the built in regulator (B&C) and others
wire around the regulator (Plane-Power) to effect positive
external control of field excitation for the purpose of
turning it ON or OFF at will, or shutting it down if
the regulator goes TU.
A myth commonly circulated throughout the vehicular
DC power systems world is that it is undesirable,
dangerous, deleterious, or (as has been articulated
here on the List) just plain stupid to turn an
operating alternator ON and OFF at will. It's
a well circulated, overly fertilized myth easily
demonstrated to be horse-pucky. The desirability
for and effects of random or purposeful control
of an alternator at will are completely benign
to the alternator and equipment it powers.
But if the regulator wanders into the weeds,
you gotta have a method to turn the thing OFF
(or disconnect it from the airplane) in a timely
fashion while minimizing smoke and flames.
Bob . . .
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