MIL-DTL-62186C
4.3.5 Operating requirements verifications. Alternators shall be subjected to and pass the
operating requirements tests as specified in 4.3.5, while exhibiting no external oil leakage greater
than a loss of one fluid drop per hour (see 6.6.3). Unless otherwise specified herein, operating
requirements tests shall be conducted under the following conditions:
a. Oil inlet temperature to the alternator shall be maintained at 225 5F (107
2.8C).
b. Alternator coolant oil shall be MIL-PRF-2104, grade 30.
c. Inlet oil supply pressure shall not exceed 45 2 psi (310 13.8 kPa).
d. Alternator outlet pressure shall not exceed 5 psi (34.5 kPa).
e. The tests shall be conducted with the alternator at a stabilized temperature. The
temperature shall be considered stabilized when constant conditions of speed and
load current fail to cause a change in alternator oil inlet and outlet differential
temperature by more than 2F (-1.1C) during a 10 minute period.
f. The loads shall be resistive and variable to allow 1000 A maximum.
g. Oscillograph galvanometer response shall be flat within 5% from 0 to 2000 Hz.
4.3.5.1 Overspeed test. Connect the alternator to a test circuit as specified in figure 10.
Operate the alternator at 10 000 rpm with open field for a period of 1 minute. There shall be no
external oil leakage greater than a loss of one fluid drop per hour, or any other evidence of
damage.
4.3.5.2 Maximum field voltage test. Connect the alternator to a test circuit as specified
in figure 10. With the alternator not operating, apply a field supply voltage of 22 Vdc (EF) to the
alternator field pin (A to C) at the J2 connector for 30 minutes. There shall be no evidence of
damage.
4.3.5.3 Field resistance test. Connect the alternator to a test circuit as specified in
figure 10. Verify that the alternator field resistance between terminals A and C on the J2
connector with the power supply disconnected is 1.80 0.25 .
4.3.5.4 Output power test. Connect the alternator to a test circuit as specified in
figure 10. With the alternator operating with an output power of 650 A (IA) at 28 Vdc (EF), the
field current (IF) shall be not greater than 4 A.
4.3.5.5 Ripple voltage test. Connect the alternator to a test circuit as specified in
figure 11. The ripple voltage at ES shall be not greater than 4 V (+peak -peak and peak-to-peak)
for each condition as specified in table IV.
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