Voltage Regulator - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 580 AND BARON 58TC
MAINTENANCE MANUAL
DC
GENERATION
MAINTENANCE PRACTICES
Paralleling adjustment is not
necessary unless
inspection
reveals
a
need for adjustment
or
when the
loadmeters
I/OL TAGE REGULA TOR
indicate
unsatisfactory paralleling of the two
alternators. The
loadmeters should indicate that the alternators
are
sharing
The
output
of each alternator is regulated by
a
fully
the load within 10% when each alternator is operating
at 30%
transistorized electronic
voltage regulator
located
on
the ah
or more
of its rated output.
side of the forward cabin bulkhead prior
to
TJ-134 and TK-71
The regulators
are
located below the front spar
covers on
TJ-134 and after and
on
TK-71 and after. Each voltage
regulator is
adjusted
to
28.25
t
.25 vdc and will
automatically
NOTE
adjust
the alternator
output
to
the required
electrical load,
including battery recharging.
The
two
voltage regulators
are
The altemators may not
share
an
extremely light
connected
together with
a
single
wire between the PAR
load
equally.
(paralleling)
terminals. Thus
through their respective
internal
paralleling circuits, the output
of each alternator is
maintained
at
a
minimal difference.
The
procedure
for adjusting the voltage regulators
described
below is based
on
the
principle of adjusting
two
equally
VOLTAGE REGULATOR REMOVAL
warmed up
voltage regulators
to
produce nearly the
same
voltage
without the benefit of
a
paralleling
or
equalization
I
a.
Gain
access
to
the
voltage regulators,
circuit. This is the
reason
for making the balance adjustment
b.
Disconnect all
electrical wiring
and tag
all wires to
with the PAR ~(paralieling)
circuit disconnected, and it
yields
the maximum amount
of automatic control range under
facilitate reinstallation.
c.
Remove
screws
securing the
voltage
regulator to
operating conditions.
the
bulkhead.
d.
Remove the voltage
regulator.
Each regulator is capable of nearly 1.0 volt
of automatic
control in the positive
direction. This is in terms of the input
VOLTAGE
REGULATOR INSTALLATION
voltage at
the BUS terminal. Because of the high gain in the
equalization
circuit within the
voltage regulator (exceeding
I
a.
Position
the
Mltape
regulator
on
the mounting
80:1), the fi*d voltage
difference of
5 to
B volts which
occurs
when the PAR circuit is
opened, corresponds
to
only
a
small
bracket.
b.
Secure the voltage
regulator
with the
retaining
percentage
of the available automatic
compensation
range.
Therefore,
a near zero
adjustment of the field
voltage
screws.
c.
Connect all
electrical
wiring,
balance
during the procedure
with the PAR circuit open is not
necessary but the
adjustment should be
as
low
as
possible.
CAUTION
Since
the voltage regulators
are
used in
parallel
output
alternator
systems,
their final
adjustment should be made
in
Ensure that wires
are
installed
as
noted in the
actual operation
of the airplane system.
These adjustments
removal. This will
prevent
serious
damage
to
the
may be made while operating
one
engine only.
The left
airplane components.
engine
has been selected to permit
a
completely safe
access
to
both
voltage regulators
so
that they
may be adjusted while
the engine is operating without
danger of personal injury
from
NOTE
the
propeller.
After voltage
regulator has been mounted in
position
and properly
wired, perform the
VOLTAGE REGULATOR ADJUSTMENT and
the
OVERVOLTAGE SENSOR CHECK.
WARNING
Do
not
operate
the
right engine.
VOL TA GE REGULA TOR
ADJUS~MENT
AND
PA~ALLELING (Figure 201)
The following
steps
should be used
to
adjust
and parallel
the
The
voltage regulators
are
preset to
28.25 .25 volts.
voltage
regulators:
24-31-00
Page 201
Nov 30/78