Piper Comanche PA-24 Service Manual page 674

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PIPER COMANCHE SERVICE MANUAL
"1"18
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FIGURE '·3. WIRING CIRCUIT 01' THREE UNIT REGULATOR
opniAc tb ...... Ietor paints opeaa the .. pletor serial wiIIIIiDl cilcult 10 Ibet its lII .....
tic
field
coUapoes c"",pl.t.ly. Th. cOllS.queuce is tb.t the III.Fetic field ie reduced sufficieat!y to aUow
the spiNl Iprinl to pIlll tb •• r ... ture • ..., &_ the core 00 th.t the coateet paiIIts .Cein cl .... .
This clirecUy I'ouads the paeretor field cilcllit so thet ...... tor volt. ODd _put iDe . . . . .
The above cycl.
at
actioa o .. in ta.1 plac:e ODd the cycl. cODtiDues at • rete of SO to 200 times
a secoad, reculatinl the volt • • to • predetermiaed value. lYitb tbe volt • • Ibus lilllited the CeD'
erator suppliel varyilll OIIIQUlltl of c", .. 1It to lII_t tho varyillC st.t.1 ci bettery ch . . . ODd .Iee·
triesl load.
9-24. Cu,ront Rotulotor .
•. The c"".1It re ... lator (Fi .....
~3)
bas a lerie. wiIldillC
<L
a fo.
tums
ol
beavy wire .. Ilich
carries all paer.tor output. The willdilll core
is •••
mbled iIlto a f ..... A nat _ I arm.t ....
is
a rtocbod to the frame by a n.xible billC. 10 thet it ie jut abo .. tho cere. Tho orm.tIIre has a
c oat oct poillt which il juet bel.,., a Itatioaary coateet poillt. Whoa the curreat reculator i. oct
operetillc. the tooaioa of a spiral sprillC holds tbe armllture aw.y from tho cor. so that the poillt.
are
ill
conteet.
\D
thil positioa the lea ... tor fi.1d circuit is co .. pl.ted to I'oomd tbrCllp the
currellt recuielor contact poilltl ill seriel witb tbo volt .. e replotor eOlltact paillts.
b. Wbea tbo load de .. """" are he.vy, as for oumplo, wbea .Ioct:iesl d.vie ..... tumed on
and the battery is ill a discwpd condition. the volta .. lII.y Dct increase to a v.l ... sufficient to
caul. the volta .. recuietor to operat •. Cons.quently, ....... tor output will eoDtillue to incr ....
until the &ellerator reaches rated maXlmum current. This is the cumu:at value for which the current
'eculator is set. Thor.fore, wh.n the lea.rotor reaches ,eted output. ibiS output. nowilll throucb
til. current recuiator willdin&. cre.tes sufficient .... aeti ... to pull the current ,ecul.tor .....
1Iture
down ODd open the contact paillts. With til. poillts open. reaistance i. inserted into the p ... mar
field circuit so that the &enerator output is reduced.
c.
As
soon as the pa.,ater output storti to fall off. tb. lIIaenetie fi.ld of the current 'ecuielar
ELECTRICAL SYSTEM
ISSUED: 811Bn2
3 A22