Piper PA-24 Comanche Service Manual page 550

PIPER COMANCHE SERVICE M,lNUAL
•
(C)
VARIABLE
)1(
RESISTANCE
I, II
aenerator speed and make sur. "the cutout relay
points q»en.
:vIethod 2 -
~ake
connections as in Step
(c), hut in addition add a variable resistor
connected into the field circuit (Fipre
~11).
Use a 2S ohm-25 watt resister. Operate pn-
eratot
at
medium speed with variable resistance
turnlld 811 in. Slowly decrease (tum out) the
resistance until cutout relay points clc:.e.
~ote c:10linl voltage. With cover in plaee slowly
increase (turn in) resi'tllllce to make sure points
open.
d. Adjust cll»inC voltace by cumina ad-
jUStini screw (Figure 9-12). Tum screw clock-
wise to increase settine and cout1ter-elockwi••
to decease settini.
REGULATOR
VOLTMETER GENERATOR
ADJUsnNG SCflEW
(TURN
TOADJUST
CLOSING
VOLTAGE
FIGUR E 9.12. ADJUSTMENT OF CUTOUT
RELAY
CLOSING VOLT AG E
IIIGURI9·11. CHECkiNG CUTOUT RELAY'
CLOSING VOLTAGE
•
•
9-35.
Current R.gulator. Two checks aad
adjustments are required
Oft
the current rep-
later: air aap and current senina.
Air Gap - Cheek and adjust in exactly the .ame lUftIler as for the volta.e reaulator.
Clment Settina - Current replator
Mttiftl
on currem tel'llaton havina temperature com-
pensation should be checked by the followiDll'Ilethod:
Load
~ethod-
a. Connect ammeter into cb_lin. circuit. as in Fipre
~13.
b. Turn on all aeeessory load (lichts. rlNiio. etc.) aracl
COlUlect
an additional load across the
battery (such as a carbon pile or bend of lipts) so as to drop tbe system volta.e approximately
one volt below the voltap replator Settinl.
c. Operate pnerator at specified s'P"d for
15 minutes with cove: in place. (This estaba
lishes ot:teratina temperature; see par_eraphs
(c) and (d) in General Instructions.) If current
regulater is not temperature-eompensated. dis-
regard 15 minute warm-up period.
d.
Cyc~e
lenerator
and
note current .etting.
e. Adjust in same milliner as described for
tlie \'olta,e recuiater (Fieur. 9-6).
Jumper L.ud
~ethod
- (Use only for cur-
reftt regulaters without temperature compen-
unon.)
a.
Connec~
ammeter into charline circuit.
as in Filure ~14.
~. Connect jumper lead acroSs voltace
regulatcr ;:Joints, as in Fieure 9014.
c. Turn on all lights and accessories er
load battery as in
(b)
under Load Methcx:l..
d. Operate lenerator at specified speed
ELECTRICAL SYSTEM
ISSUED: 8/18172
3
84