Piper PA-32RT-300T User Manual

LANCE II SERVICE MANUAL
SECTION XI
ELECTRICAL SYSTEM
11-1.
DESCRIPTION.
The electrical system
of the Lance
II is a 14-volt, direct
current,
single wire,
negative
ground system.
All electrical
equipment
is grounded
to the
metal
structure
of the
airplane, therefore,
the
structure takes
the place
of the second
wire. A
12-volt
battery is incorporated
in
the system
to furnish power
for starting
and as
a reserve
power source
in case
of alternator
failure. The
battery and alternator
are
both connected
to
the
bus bar;
from which
all the
electrical
equipment
is powered,
with
the exception
of the
starter which
receives
its power
from
the load
side of
the battery.
The
master
switch
controls
the battery
relay
and the
alternator
field
circuit. The
master
switch must
be on
before
any electrical
equipment
will operate.
The
Lance II
can be
equipped
with the
standard
position lights,
anti-collosion
lights, and
one landing
light located
in the nose
cowl
assembly.
11-2. TROUBLESHOOTING. Troubles
peculiar to the electrical system
are listed in Table
XI-III at the
back of this section
along with their
probable causes
and suggested remedies.
The wiring
diagrams
included in
back of this
section will
give a physical
breakdown
of the
different electrical circuits used in this airplane.
After the
trouble
has been
corrected,
check
the entire
electrical
system
for security
and
operation of its components.
11-3.
ELECTRICAL
POWER
SUPPLY.
The electrical
power is
supplied by
one 12-volt
battery and
a 14-volt
direct current
alternator.
The alternator
is located
on the front
lower
right
side of
the engine
and utilizes
a belt
drive from
the engine
crankshaft.
Many
advantages
both
in operation
and maintenance
are derived
from this
system. The
main advantage
is that
full
electrical power
output is
available at
lower engine
RPM.
The
alternator
has no
armature
or commutator
and only
a small pair
of carbon
brushes,
which
make contact with a pair of copper
slip rings. The rotating member of the
alternator,
known
as
the rotor,
is actually
the field
windings.
The
rotor draws
only
1/20th of
the
current
output.
Therefore,
there
is very
little friction
and
negligible
wear and
heat in
this
area. The
alternating
current
is converted
to
direct current
by
diodes pressed
into
the end
bell housing
of
the alternator.
The
diodes
are highly
reliable
solid-state
devices,
but are
easily
damaged
if current flow
is reversed
through
them.
The alternator
system
does
not require
a reverse
current
relay,
because of
the high
back
resistance
of the
diodes and
the inability
of the alternator
to draw
current or
motorize. A
current
regulator
is
unnecessary
because
the windings
have
been
designed
to limit
the
maximum
current available.
Therefore,
the voltage
control
is the
only control
needed.
Issued:
1/3/78
ELECTRICAL
SYSTEM
2F15

Piper PA-32RT-300T Specifications

General

Brand	Piper
Model	PA-32RT-300T
Category	Aircrafts
Language	English