nuckolls.bob(at)aeroelect Guest
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Posted: Sat Apr 25, 2020 10:01 am Post subject: Alternator field control configurations |
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At 01:54 PM 4/24/2020, you wrote:
Quote: | --> AeroElectric-List message posted by: "Dan Fritz" <Dfritzj(at)yahoo.com>
Are the typical ND IR alternators of the Internal Regulator
A-Circuit type with the control input simply bonded to the
B-lead? |
To the best of my knowledge, all ND alterantors are
A-Circuit. The CONTROL input is not driven by the
b-lead.
CONTROL inputs exist only on internal regulated
machines. This input comes from the IGN circuit
in automobiles or the ALT switch in airplanes.
It supplies no current to excite the field winding,
only an ON/OFF command to the regulator electronics.
See attached block diagram of A-Circuit, I-R alternator.
Quote: | If so, then the mod I've performed with the non-conductive screw
(in the other thread on Alternator Mods) only gives control in
"normal" ops and does not protect from a failed regulator,
meaning a b-lead disconnect would still be required. Correct? |
No. The purpose of your mod is to completely
isolate the brushes from the factory A-Configuration
(one brush to B-term, the other to the regulator
output transistor). When two wires are brought
out as part of the mod, the machine then becomes
'universal' . . . you may then use an external
regulator of any stripe.
Bob . . .
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