Piper COMANCHE PA-24-180 Service Manual page 549

PIPER COMANCHE SERVICE MANUAL
ADJUSTING SCXRWS
FIGURE 9-9. CUTOUT RELAY
FIGURE 9-10. CUTOUT RELAY
AIR GAP CHECK AND ADJUSTMENT
POINT OPENING CHECK AND ADJUSTMENT
current flow to the required smount.
Allow generator to operate at this speed and current flow for 15 minutes with regulator
cover in place in order to bring the voltage regulator to operating temperature.
e. Cycle the generator by either method listed in Step (e) of "Fixed Resistance Method" of
"Voltage Setting" procedure.
f. Note the thermometer reading and select the "Normal Range" of voltage for this tempera-
ture as listed in specifications paragraph 9-41.
g. Not the voltmeter reading with regulator cover in place.
h. Adjustvoltage regulator as required as described in Step(h) of "Fixed Resistance Method"
of "Voltage Setting Procedure." In using the variable resistance method, it is necessary to re-
adjust the variable resistance after each voltage adjustment to assure that 8-10 amperes are
flowing. Cycle generator after each adJustment before readingvoltage regulator setting with cover
in place.
9-34. Cutout Relay. The cutout relay requires three checks and adjustments: air gap. point
opening, and closing voltage. The air gap and point opening adjustments must be made with the
battery disconnected.
a. Air Gap - Place fingers on armature directly above core and move armature down until
points just close and then measure air gap between armature and center of core (Figure 9-9). On
multiple contact point relays, make sure that all points close simultaneously. If they do not, bend
spring finger so they do. To adjust air gap, loosen two screws at the back of relay and raise or
lower the armature as required. Tighten screws after adjustment.
b. Point Opening - Check point opening and adjust by bending the upper armature stop (Figure
9-10).
c. Closing Voltage - Connect regulator to proper generator and battery. Connect voltmeter
between the regulator "GEN" terminal and ground (Figure 9-11).
Method 1 - Slowly increase generator speed and note relay closing voltage. Decrease
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3 B3