Section
VII
Systems
Description
ALTERNATORS
BEECHCRAFT
Duchess
76
I
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,and,
after
)
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1
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in the airplane.
The
output
of each alternator is controlled
by
a separate
voltage regulator. The alternator systems are completely
separate,
excel?t
for the
BUS
TIE FUSE (on airplanes ME-
103
and after),
the
mutual tie
to
the battery bus through two
bus
isolation circuit breakers, and the paralleling circuit
between
the
regulators.
The
bus-isolation circuit breakers
are
used to isolate Bus 1 and Bus 2 from the battery bus
circuit.
The
regulators
automatically
maintain
the
bus
voltage at a set value for all loads up to the alternator rating.
The
voltage regulators also maintain approximately equal
load sharing between the two alternators.
The
self-excitation load capability of the
alternators
is
directly related
to
engine RPM. The self-excitation feature
will not come on until approximately 1200
to
1400
RPM,
with a load capability
of
approximately 50%. However, it will
remain on as engine speed is reduced to approximately 850
to
1000
RPM. A maximum load capability of approximately
80%
should be obtainable at approximately
2300
RPM
engine speed.
CAUTION
During
an
in-flight
emergency,
under
no
condition, shall more load be applied
than
is
absolutely necessary for safe flight condition.
Initiation
of
any flight using
the
self-excitation
feature is strictly prohibited.
7-28
April
1979
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