Piper Comanche PA-24 Service Manual page 680

,eaerator speed and malee
S\UtI
"the cutout .. lay
points ~n.
lIIethod 2 - liIake ComectiollS as in Step
(c), but in addition add a variable .. sistor
connected into the field ciJeuit (Fi ......
~11).
Use a 2S oIIm-25 .. at! resistor. Operat. pa-
erator at lIIedium speed with variable resistance
turned all in. Slowly decrease (tum out) the
resistance until cutout relay
pOints
close.
Note c1oaialvoltap. With coverin place slowly
increale (tum
in)
resistance to make sure points
open.
d. Adjust cloainl volta,e by tumina ad-
justin, screw (Fiaure
~12).
Tum screw eloek-
wise to increase seniDi and counter-clcxkwise
to decease setting.
9-35. Curront Ro,ulator. Two checks and
adjustments are required.
<Xl
the current rel'l-
lata: aiz lap and cu.rrent sertinl.
PIPER COMANCHE SERVICE M.4NUAL
REGULATOR
(3JVAAIAllLE
'H'
RESISTANCE
II "
.
.........
VOLTMETER GENERATOR
FIGURE 9·11. CHECKING CUTOUT RELAY"
CLOSING VOLTAGE
Air Ga(l _ Check and adjust in exactly the same manner .s for the voltale
~&ulator.
CW"r'eDt Sethne - Curren.t reculatcr settiDI on cunent reCUI.tors havlllg temperatW"e com-
pensatiOll should b. checked by tbe follo"iDa method:
Load :IIethod-
•. Connect ammeter into charging circuit, as in Figure 9-13.
b. Turn '" all accessory load (lillhts. radio. etc.) aad connect an additional load across the
battery (sucb .s a corbon pue or band of lights) so as to drop the system volta,e approximately
one volt below the voltace relulacor
settina.
c. Operate lenetetor at specified speed for
15 minutes with
cove~
in place. (This estab-
lishes operaung temperature; see paragraphs
(cJ and (d) in General Instructions.) If current
re-Iulater is not temperature"'Compensated, dis·
regard.
15
minute war:n-up period.
d; Cye!e generator and note current setting.
e. Adjust in same milliner a8 described for
toe \"oltaae reaulata (Filure 'fo6).
Jumper Lead :IIethod _ (U •• only for cur-
rent regulators without temperature com.pen ..
satian.)
a. Connect ammeter into chuling
CUCUlt.
as in Flgure ~14.
b. Connect jumper lead across voltace
regulata
~o"'ts,
as
In
Fil"'e
~14.
c. Turn an. all U&hts and accessories
01'
load battery as in
(b)
under Load :IIethod.
d. Operate pneutor at speclfied speed
ELECTRICAL SYSTEM
ISSUED: 8118/72
ADJUSTlNQ SCREW
CTUAN TO ADJUST
CLOSING VOLTAGE
--~~
FIGUR E 9.12. ADJUSTMENT OF CUTOUT
RELAY CLOSING VOLTAGE
3 84