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Piper Comanche PA-24 - 9-21. REGULATORS; 9-22. CUTOUT RELAY; 9-23. VOLTAGE REGULATOR

Piper Comanche PA-24
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PiPeR
COMANOIE
SERVICE
MANUAL
9-21. R
...
let
••.
Th.
re",lat
..
abo,",
iJI
FiCUre
9-3 CODaI.1I
01
a
cut""t
relay.
a volta
..
re",-
lator. IIId a c
.....
at
replater
llllit.
Th.
cutout reloy
close.
the
....
rtlor-!~ttery
circuit
.bea
the
....
r.t
..
volta
..
is
sufficient
to
ch
....
tbe
batt.ry.
aad
it 0
.....
the
circuit
wh.a
the
..
aer-
.tor
.1
....
dowa
...
tops.
Th.
volt
...
r
..
utor
llllit
is
a
volt
....
limitilla
device
th.
prev
...
t.
the
ay
....
volt
...
Ir
...
nceediJIa
••
pacified
..
ui_
aad
thus
protecta
the
bett.ry
cd
other
volt
......
Dsitiv.
equipmeat.
The
current
replato.
Ullit
i
••
c
.....
Dt-limitiJIl
d.vlc.
that
limits
the
lnerator
output
so
as
flat
to
exceed
itl
rated
maXimum..
9-22.
C.t
..
t
Rei.,.
.
•.
Th.
cutout
r.l.y
(Fia"'"
9-3)
~
..
two
.iJldina
•••
I.ri
•••
iJldina of •
fe.
tuml
cI
h.avy
wire
and
a
shuat
.indiA,
of many t
.....
of
fiA
••
ire (Ihown
iA
d
..
heeI
liDH).
Th.
IhUDt
wiAdiJI,
i.
coanacted
acrou
the
..
aerator
10
that
leaer.or
volta
..
il
impre
..
ed
_
it
••
U ti
.....
Th.
lerin
wmdina
i.
COftD.ected
in
series
with
the
eberlin.
circuit
10
til.
aU
._ratar
output
puses
throuah
it.
The relay core
cd
.indiAll
are
......
bled iJlto a fr
.....
A flat
Iteel
arm."",
is
.t-
tached
to
the
fr
....
by • flexible
hiA
..
10
that
it
ia
C8fttered
jlllt
ab
....
the
:"111
cI
tha
core.
Th
•
• rm.ture
contact
poUlt. are
located
jUlt above tha
.t.tionary
cootact
poUlt:
'b.n
the
,e
..
r.tor
is
Dot
opar.iA,.
the
.....
ture
coatact
poiAlS
are h.1d
...
y from
the
ltatioowy
poiJIts by
the
teD-
lian
of.
fl.t
IpriDg riveted on
the
lid.
of
the
....
atur
••
b. Wh.n the
,etWr.ter
volt
...
buildl
up
•
v.l
..
,reat
enoaah
to
cha
....
the
b.ttery.
the
...
g-
Deti
...
iJlduced by the
rel.y
wiAdiJlp
is
.uffici.Dt
to
pull
the
.....
twe
toward the
co
..
'0
that
the
cootact poiDts
cl
....
This
c
...
pl.t.1
the
circuit
betwHa
th
...
aerator
and
bettery.
Th.
c ......
at
.hich
flow.
from the
..
nerator to the
bett.ry
pas.e.
through the
seti_
wiAdUI,
iA
•
direction
to
add to the
_anelil
..
holdiAl
the
......
t_
dawn and
the
contact
poiAts
closed.
c.
Wh.a
the
..
aerator
110
..
dawD
or
ItOpa • .:arreDt
baaiD.
to
flow
fr
...
the bettery
to
the
.eneratOl.
d.
This reverse
flow
of
current
through
the seri
..
windinl
caues
I reversal
of
the series
wiAding
".In.tic
field.
Th.
".&netic
fi.ld
cI
the
shunt wiJIdiA,
does
aot reverae. Therefore. in-
stead
of
helpiJI,
each
other.
the
two windings
now
..
agnetic.lly
oppooe
so
that
the
..
Iultaut
...
,-
netic
fi.ld
bee
.....
iAsufficie"t
to
hold the
.....
ture
down.
Th.
nat
SPM'
pulls
the
.....
ture
....
y
fr
...
the core
so
that
the
poiAts
s.perat.:
this
open.
the
circuit
be_n
the
,.Der.tor
.Dd
battery .
9-23.
Volt.,e
....
I.t
...
L
Th.
volt
...
r.",latar
(Fi"".
9-3) h
..
two
_diJI,s
......
bled
on
a
linale
core
••
abunt
windin,
cOIISistinl
<:t
.. any
tum.
of
fin
••
ire
(Ih"""
in d
..
heeI
liDeI) which
is
shunted
aerol.
the
",D.rator.
and
...
riel
.indiJIl
of • few
tum.
cI
relatively
heavy
.,ire
wbich
il
connected
in
seri
••
with
the
pa.raux
fi.ld
circuit
wh.n
the r
..
ulllor
coatact
points are
closed.
b.
The
.,indiA,1
and
core are
......
bled
into.
fram
•.
A flat
Iteel
.....
ture i
••
ttached
to
the
fr
....
by • flexible hin
..
so
th.t
it
is
just
above the
.nd
of
tb.
core.
Th.
ar
...
ture
contams
8
contact point wbich
is
just bell.ath a
statioaay
CCIl,act point.
When
the
voliale
rel'll.tar
is
not
operotiaa. the
t.naion
of a
spiral
Ipring
holdl
the
ar
..
eture
a.oy
fro
..
the
care
10
th.
the poiJIts
are
iA
contact
and
the
leneratar
fi.ld
circuit
i.
co
..
pleted
to
arOllDd
throuah them.
c.
When
the
..
nerator
volt.,e
r.acb.1
the
v.lue
for
which the
yolt.,
...
au!ator
is
adjusted.
the
...
gn.tic
fi.ld
produced by
the
two windinas (.bUDt and
••
riel)
ov.rcQll\
••
the
......
ture
sprine
tenl10ft
and
pulls
the
armat\lfe dawn
10
that the contact poiDta
..
parate.
This
inserts resistance
iAto
the
,.nerator
fi.1d c1rcuit
10
tbat
tb.
generator
fi.ld
curreat
and
volt
...
are reduced. Reduc·
tion
of
the
pn.r.tor
volt
...
reduce.
the
....
".IlC
fi.ld
of the
re,uI.tor
Ihunt
wiJldine.
Alia.
3
A21
ELECTRICAL
SYSTEM
ISSUED:
8/18/72

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