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Rockwell Commander 112 - Page 211

Rockwell Commander 112
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SECTION X
ELECTRICAL
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC/TCA
MODEL 112
(Serial
numbers
471
and
subsequent),
and
MODELS
112B/TC/TCA.
VOLTAGE REGULATOR.
The
voltage
regulator
used
in
this
aircraft
is
of a
simplified
trouble
free
design.
The
regulator,
mounted
on
the
left
side
of
the
fuselage
just
aft
of
the
firewall,
is
used
in
conjunction
with
the
alternator
and
is
initially
adjusted
to
set
voltage
at
14.
1
(:!:"
.1)
volts.
Proper
operation
of
the
voltage
regulator
dur-
ing
initial
adjustment
must
be
determined
by
reading
a
calibrated
precision
voltmeter.
Check
the
bus
bar
voltage
by
connecting
the
positive
terminal
of
the
volt-
meter
test
lead
to
the
bus
bar
and
the
negative
term-
inal
of
the
voltmeter
test
lead
to
one
of
the
grounding
screws
on
the
instrument
panel.
Place
the
alternator
switch
to
ON.
Turn
on
navigation
lights,
rotating
beacon
and
other
equipment
to
obtain
a
load
of
10
to
15
amperes.
With
engine
running
increase
engine
speed
to
1550
rpm
and
run
for
a
minimum
of one
min-
ute
before
reading
voltmeter.
Monitor
main
bus
bar
voltage
and
adjust
screw
on
voltage
regulator
until
voltage
reads
14.1
(:!:"
.1)
volts.
The
adjustment
screw
is
located
under
the
plastic
plug
on
the
regulator.
If
the
regulator
can
not
be
adjusted
to
the
above
setting,
check
the
alternator,
overvoltage
relay,
master
switch,
circuit
breaker
and
battery.
Assure
these
components
are
in
good
condition
prior
to
replacing
the
regulator.
After
proper
adjustment,
with
the
engine
running
at
2700
rpm,
the
system
will
maintain
voltage
at
14.2
(~
.25)
volts
as
read
on
the
airplane
voltmeter.
10-4
Do
not
interchange
regulator
leads
and do
not
momentarily
connect
the
two
voltage
regulator
terminals.
Any
attempt
to
do
so
will
de
stroy
the
regulator.
DIAGRAMS
The
electrical
diagrams
are
divided
into
four
parts.
Part
I,
page
10-9
applies
to Model 112
(Serial
num-
bers
6
thru
187).
Part
II,
page
10-31
covers
Model
112
(Serial
numbers
188
thru
380).
Part
III,
page
10-45
is
applicable
to Model 112
(Serial
numbers
381
and
subsequent)
and
Model 112TC
(Serial
numbers
13000
thru
13149).
Part
IV,
page
10-59
covers
Model
112B,
Model 112TC
(Serial
numbers
13150
and
subse-
quent)
and
Model
112TCA.
A
Wiring
Diagram
Index
in
front
of
each
part
provides
the
title
and
number
of
the
circuit
desired.
Minor
changes
in
a
system
are
shown
within
the
diagram
by
symbols,
effectivity
or
a
"NOTE".
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**

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