Regulator Checks And Adjustments; Voltage Setting - Piper PA-24 Comanche Service Manual

•
PIPER COMANCHE SERVICE MANUAL
9-32. V.lto.. R..ulatOl'. Two checks and
adjuatlDntll . . required on the volta. regu-
lator,
air
lap ud volta.
'«tina.
a. Air Gap - To eheck
air
pp. push ar-
lIlature
down
IIDtll
the COlltKt points are
just
touchilll .Dd lb...
.....Unt
air liP (F
iaure
H). Adj ..t by "".OiDCtha COIltaet mounting
screw.
aadraiaiDC or loweriftc cant*=t bracket
.. Nquirad. Be sure the poiats are lined up
aad
tiPt-
scnr".
after adju,tmeat.
ADJUSl1NG SCREW
(TURN TO ADJUST Sm'NG)
tilt·
N~
...
,
FIGURE 906. ADJUSTING VOLT AGE
REGULATOR SETTING
9-33.
V.I....
Httin,.
nere are
two ways
to check the volt• • setti.al-the fixed
re-
siataac....thod aad the variable resislance
lIIethod (refer to fieures 9-7 a.ad 9-8).
Fised R.sistanc. Method-
a. COIIIIect a
fiHd resistance
between
the bauel)' term.inal aod around u sboWD in
Fipre
9-7
after
disc:oMeCtinC the battery lead from the
.1ft1)'
tamiAal of the
ntlUlatOl'.
The re-
sistance lIlust be 1'f1 obma for 12-volt
Wliw.
It mut '- capable
of
c-nyiftC 10 amperes without
any
chanae
r:i.
resistuce with temperatuN chua,',
b. Connect a yoltmeter from tepa1ator "BAT" termillal to
crOlUld.
c. P1ac:e the thermometer
within
~~
blch of replator cover to ....ur. relulator ambient tem-
perature.
d. Operate generator at
specified. speed for 15 lIlinute. with replator cover
in
place to brine
the voltace recul.tor to operatinl temper.we.
•
GENERATOR
VARIAILI
ItEIIITAHCE AMMITER VOLTMETER
REGULATOR
GENERATOR
((I))
VAlUABLE
)=(
RESISTANCE
lAT.
{
FIXED RESISTANeE
1 1-2 OHM'
-12 VOLT
VOLTMETER
o
REGULATOR
•
FIGURE
9·7.
CHECKING VOLTAGE
SETTING, FIXED RESIST ,\NCE METHOD
FIGURE
'·8.
CHECKING VOLT AGE
SETTING, VARIABLE RESISTANCE METHOD
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3
81