Piper Comanche PA-24 Service Manual page 672

PIPER COMANCHE SERVICE MANUAL
c. Short circuits in the ..... _ ue loeated
by
ua. of a Ifowle •• Wllea the ..... _ ia revolved
iD the _Ier, with a It . . 1 strip ."ch u • hack
.a.
blacle held above it, tile blacla will vibrate
above the .a. of the """ature core iD which the ahort
is
loeatac!. Copper or brush dut iD the
Ilots betweell the COlDlI1Itator bus
so_tilDes
cauan aborts betwen Mrs wlUch c ... be aliaiDated
by
cl .... iIll out the Ilota. Shorts at
c:roaa-o .....
of the coila et the core ead c ... oftea be allmi·
nated
by
budiD,
wirws
lli",Uy and rewlll.tiIl, the
e~
bus wire.
d. Grollftds in the umature
Ir.
detected
by
u •• of a teat I .... p IIIId test paiDts. If the I_p
liahts when one test PO;Dt is placed on tIIa co .... utator ,.;tII the otlls. poiDt on the core or shaft,
tile """ature is lfOunded. Grounds oeCIU as a ... ult of insulation failure, which ia
ott... ..........
t
on by
overioediDl ... d conaeqaeat overlleatill, of the ,"erator. Repei ..
CSD
som.times be .. acle
if _ d . are
at core eads ( .. here coils cOllle out of slota)
by
placiDl iDSUl.tiIl' strio. betw...,
core ODd coil which hu ,,,,unded.
9-19. Polariainl Gen_r. After a pDarator hu been repaired ODd reiDatallaci or .t any time
aftar a pllerator hu beeR te.tacl, it lIIut be repolarized to .b s"re tIIat it hu the correct
polarity with ... peet to the battary it
is
to ch ... e. Failure to
c'
,Iarize the .... erator lIIay relult
iD bamed relay contact poillts, a nm-doWD battery IIIId pouibly aeriou dllllla,. to the .... e .. tor
itself. The procedure to foilow in correcting "lIerator polar
If
depetlds upoll the lenerator.re", •
. Iator .. inn, circuits; that is, whelher the ,"erator field is interllally lf01lDded or is ,fOllDded
through the re",lator.
9-20. Generator 5erYice Te.t Specification •. Delco-ReillY specifications for 12 volt "lIerators
inatalled a. stllllciard equiplllent on the PA·24-180 ODd PA·24-250 aircraft are u follow.:
Generator
1101900 1101915
Delco-ReillY, Ref. Service Bulletin
IG-150
IG-150
Brush SpriDI Tension 24 oz.
24 oz.
Field Current (80· F)
Amps 1.62 • 1.72 1.62· 1.72
Volts
12 12
Cold Output
Amps 35 SO
VOIIS 14.0
14
Approx. R.P
.M. 3100 3960
Cold Ou,,"ut: Cold output data applies to paerators at 80 de.,.e. F, and .. ith brushes well
seated. Variations in temperature and brush seetin
a
as well as the coadition of the cenerator may
cause deviations of
100 R.P.:'d. or more
from rated. speed.
Hat Output:
Hot output
is
maximum output as controlled by current regulator.
ELECTRICAL SYSTEM
ISSUED: 8118n2
3 A20