Bench Hot Stabilation Output Test - Piper Cherokee Six Service Manual

PIPER CHEROKEE SIX SERVICE MANUAL
OUTPUT
AMPERES
OUTPUT
TERMINAL
FIELD
AMPERES
VARIABLE
OUTPUT
LOAD
VOLTAGE
TEST FIELD
ALTERNATOR
TERMINAL
GROUND
Figure 10-24.
Meter Connections
for Alternator
Performance Test
10-27. BENCH HOT STABILATION OUTPUT TEST. To determine the hot stabilized
output, the alternator must be driven with a suitable driving mechanism. During this test,
the following shall be monitored: (Refer to Figure 10-24 for meter connections.)
a. Alternator output voltage.
b. Alternator output current.
c. Field current.
d. Alternator rpm.
Drive the alternator at sufficient rpm to obtain 14 volts at the alternator battery
terminal. Alternator shall be self excited, otherwise no external load shall be applied. An
external D.C. power source may be used to polarize the field but must be removed as soon
as the alternator is self sustaining. Maintain 14 volts at no load by adjusting rpm for a period
of 15 minutes, at which time record the above specified data.
Apply an electrical load to the alternator and increase speed so as to obtain 5 amperes
output (not including field excitation) at 14 volts. Maintain this condition for 15 minutes
by adjusting the rpm. At the end of this period record the above specified data.
Maintain output voltage at 14 volts and vary the load in 5 ampere intervals. At each 5
amp interval allow a 15 minute stabilization period maintaining output by varying rpm.
Record the required data at each interval. Continue this procedure through the maximum
output (approximately 10,000 rpm).
ELECTRICAL
SYSTEM
Issued: 8/17/72
3B15