Beechcraft 20138 - Adjustmenton the Bench

wise.
(This will
increase
the
voltage at
which
the
overvoltage
circuit
trips,
f)
If
the overvoltage relay
has
tripped,
allow
relay to
reset
by
momentarily
disconnecting
entire regulator unit.
Make
sure
the buss
voltage
is still
at 32.0
volts
before proceeding with
the next
step.
g)
Turn the
"O.V."
adjustment control slow_ly
counter-clockwise
until
overvoltage relay trips
(voltmeter reads
battery
voltage
and
overvoltage warning
light comes
on),
h)
Remove
screwdriver and replace white
dust cover in "O,V."
adjustment
hole,
i)
Readjust output voltage as described in
Section
4-1,
step
C,
(Output
Voltage).
j)
Remove
special
1
OHM
resistor,
and
reconnect
alternator,
regulator
and other
equipment
to
battery
as they were before
adjustment
of the
overvoltage protection circuit,
k) Replace the
white dust
cover in "Regulator"
adjustment
hold
and
remove
voltmeter.
4-2
ADJUSTMENTON THE BENCH
Bench
testing and
adjustment
of
the voltage
regulator
is to be
preferred
for the
following
reasons:
(a) The method will be
safe
in
terms
of
the
possibility of
damage
to
aircraft equipment.
(b)
Any adjustment
properly
performed
on
the
bench will be
valid
regardless
of
the specified
alternator
combination
used.
This is
true because
the
regulator
is a
voltage
sensing device, any
voltage
adjustments
performed
on the bench will be
valid
in
the aircraft.
4-4