Cessna 182 1978 - Alternator; Alternator Power System; Troubleshooting the Alternator System

MODEL
182 & T182 SERIES
SERVICE MANUAL
16-34. REMOVAL AND INSTALLATION. 60-amperes. A 28-volt 95 amper alternator is
(See figure 16-3.) offered as optional equipment on the T182. The alter-
a. Disconnect the ground cable from the negative nator is three-phase. delta connected with integral
terminal of the battery. silicon diode rectifiers. The moving center part of
b. Remove the nuts.
washers, ground strap
and the alternator
(rotor) consists
of an axial winding with
diode board from the
studs of the receptacle
and radial interlocking
poles which surround
the winding.
remove
the battery cables.
With excitation
applied to the winding
through slip
c. Remove the screws
and nuts holding the
recep- rings.
the pole pieces assume
magnetic polarity.
tacle. The receptacle
will then be free
from the The
rotor is mounted in bearings
and rotates inside
bracket.
the stator
which contains the windings
in which the
d.
To install a ground service
receptacle, reverse
ac is generated.
The stator windings
are three-
this
procedure. Be sure to
place the ground strap
phase, delta connected.
and are attached
to two diode
on the negative stud of
the receptacle.
plates,
each of which contains
three silicon diodes.
16-35. ALTERNATOR POWER SYSTEM.
NOTE
16-36. DESCRIPTION.
The alternator
system con-
A 2201074-1 balance
weight is installed
sists
of an engine driven alternator, a voltage
regu- on tailcone bulkhead station
230. 187
lator mounted on the
left hand side of the
firewall and
when the 95 amperes
alternator is in-
a
circuit breaker
located
on the
instrument
panel,
stalled.
The system is controlled
by the left hand
portion of
the
split rocker.
master switch
labeled ALT.
The
diode plates are
connected to
accomplish full-
wave. rectification of the ac. The resulting dc out-
16-37. ALTERNATOR.
put is applied
to the aircraft
bus and sensed
by the
voltage regulator/alternator control unit. The regu-
16-38. DESCRIPTION.
Thru 1977
Models the alter-
lator controls the excitation
applied to the alternator
nator
used on the
aircraft is rated
at 14-volts at
60- field,
thus controlling
the output voltage
of the alter-
amperes
continuous
output.
Beginning
with
1978
nator.
Models the alternator
used is rated at 28-volts
at
16-39. TROUBLE SHOOTING
THE ALTERNATOR SYSTEM.
(THRU 1977 MODELS).
TROUBLE PROBABLE CAUSE REMEDY
AMMETER INDICATES HEAVY Shorted
radio noise filter 1. Remove
cable from output
DISCHARGE WITH ENGINE or shorted wire. terminal of alternator. Check
NOT RUNNING OR ALTERNA- resistance from end of cable
TOR
CIRCUIT BREAKER OPENS
to ground (MASTER
SWITCH
WHEN MASTER SWITCH IS
MUST
BE OFF). If resistance
TURNED ON.
does not indicate a direct short,
proceed to step 4. If resistance
indicates a direct short, proceed
to
step
2.
2. Remove
cable connections
from radio noise filter. Check
resistance
from the
filter input
terminal to ground. Normal in-
dication is infinite resistance.
If reading indicates a direct
short,
replace filter.
If no
short is evident, proceed to
step 3.
3. Check resistance
from
ground
to the free ends of the wires which
were connected to the radio noise
filter (or alternator if no noise
filter is installed). Normal indica-
tion does not show a direct short.
If a
short exists in
wires, repair
or
replace
wiring.
16-20