Regulators; Cutout Relay; Voltage Regulator - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
9-21. Ret.'.torl. The Nplater shown ill Fipw 9003 consistl
of
a cutOllt relay.
I
volt... recu.
laree, and a cunent Nlulater wt. The cutout relay cia... tbe ..
nercoM~ttery
circuit
whell
the .enerator voltal. ia sufficient to char.. tbe battery, and it oW-as tbe circuit when the .ner..
• ter slows down or ItOpl. The volt... r..ulater lIIlit is • volta. . UIDitiJaI device that prevents
the system voltale frCllll exceedinl a specified
llai"aIII
ad thu protects
the
batte"
lad
other
volt....sensitiv. equiplll.nt. The cunent ",plator lIIIit is a
CUINIIt·liIIlitiq
device that limits the
.en.ratot OUtput
10 •
not to .xceed it. rated
mlXimWII.
9-22. Cutout
R.lay.
a.
The
cutout rel.y (Filure
903) has
two wiadiftp. a
.erie.
windinl of a few tums
of
h.avy
wire and
I
Ihunt windinl of many turns of fine wiN (shown
in
duhed
lines).
The IbUllt windina
is connected across the .. nerator 10 that In• • er volt... i. iapnued upal it at all ti..... Tb.
leri•• windinl is connected in seriel with the charlinl circuit
'0
that
IU ..
_rater output pa.ses
throulh it. The telay core and windinal •• u.a.bled into. fr.e. A flat It"l armature is at..
tacbed to the frame by a flexible hin.. so that it is centered just abow the end
of
the cor•. The
armature ccntact pointS are loc.ted just above the .tationary contact points. When the len.rator
is not Opefltinl. the armature cantact points
lIM
'held a. .y from the .tationary points by the ten'"
sion of a flst Iprinl riveted
on
the side of the armature.
b. Wh.n the lenerater volta.. build. up a value IN.t nOllch to cbarp the battery. the mal'"
netism induced by the ralay windinp is sllfficient to pull the anDature tward the core so tbat the
contact poillts el..e. This complet•• the circuit betwen the "Ge,.tor aad battery. The current
whicb flow. from the pneratar to
the
battery 118....
tbrauth
the
_ri.
windinC in a dizection to
.dd to the ganett.1II holdinC the arm.ture down aftd th_ contact points cloaed.
c. When the pnerator slow. down or ItO". aanent
belias
to
flow from
the battery to the
aenerator.
d. This rever.. flow of current throup the
seri. .
windinC caue. a NYe,.al
of
the series
windin, m'lnetic field. The lIIa. .tic field
«
the shunt windinl does net reverse. T1Mtrefonl. in..
stead of helpinl eacb other, the two windin,1 nO" lIIapetically oppou so that the resultant mal'"
netic field becomes iDsufficient to hold tb.
armature
down. Tbe nat sprill. pulls the armature
aw.y from the cere so that the points separate; this open. tbe circuit between the ._nerator .nd
b.ttery.
9-23. Volto,. R.,ulotOt.
a. Th. volt ... re&Uletor (Fiaure
~3)
h.. two windinl. us.mb1ed an a .iftl_ core, a sbunt
windinl consi.tiJll
«
many turns of fin. wire (shown in dashed lines) which i. shunted across
tbe ..ner ator,
and
a series wiJldinl of • few tum. d. relatively beavy wiN wbich i. ccanected
in
series with th_ teneratar fi.ld circuit when the rqulaor contact pointl
IN
cloaed.
b. Th. windinls
and
core are ....mbled into a fNllle. A flat It"l anDatwe il atuched to
the frame
by
a fl.xible hinl. so that it
is
just abeNe the end of
the core. The armature cantains a
contact point whicb is just ben•• th • stationary contact point. When the voha,. repl.tor
is
not
operatina. the t.nsion of a Ipiral Sprinl hold. th. _ _ are
aw~
frOIll the con so tbat tbe points
life in contact .nd tbe lenerator field circuit
i.
COlllpleted to ,round tbroup th....
c. When the pnerator volt••e r.ache. the val.. for which the volta.. replator i. adjusted,
tbe mapetic field produced by the two windin.s (shunt aDd s.rial)
OV.te. . . .
the . .ature Sprinl
tensIon and pulls the .rmatwe dawn so that
the
contact poillts ..peate. This iftaerts te.iStance
into the lenerator field circuit
10
that tbe 'Ienerator fi.ld currant and volta.. are reduced. Reduc-
tion of the pnerator voltale reduces the maan.tic field of the lelulator shunt .",indial. Also,
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3
A21
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