MIL-PRF-62528B(AT)
E of the battery connector grounded, the regulated voltage shall be equal to or less than that at
150 A (see 4.6.1.1.2).
3.9.3 Voltage ripple. The regulator output voltage waveform shall have the following
limitations: with batteries disconnected, the alternating current (ac) peak to peak ripple voltage
shall be no more than 7 V with pin E of the battery connector both grounded and ungrounded.
With batteries connected, the peak to peak ripple voltage shall be no greater than 4 V, except that
excursions of less than 1 millisecond (ms) may exceed 4 V (see 4.6.1.1.3).
3.9.4 Current limit. The regulator shall provide current control per figure 9 and as
specified below (see 4.6.1.1.4):
a. With pin E of the regulator battery connector grounded, the regulator shall limit the
generator output to 195 ±15 A throughout the operating ambient temperature range of
-65 to 220F (-53 to 104C), and a generator speed of 3000 rpm.
b. With pin E of the regulator battery connector grounded, the regulator-generator
system shall produce no less than 150 A output current within the temperature
adjusted voltage regulation range at a generator speed of 3000 rpm.
c. With pin E of the battery connector ungrounded, the regulator shall limit the
generator output to 400 ±20 A throughout the operating ambient temperature range of
-65 to 220F, and a generator speed of 5500 rpm.
d. With pin E of the battery connector ungrounded, the regulator-generator system shall
produce no less than 350 A within the temperature adjusted voltage regulation range
at a generator speed of 5500 rpm.
e. The regulator shall attain stable current regulation in the current limit mode within 0.3
second of load application as shown in figure 3.
f. The regulator shall attain stable voltage regulation upon load release within
0.3 second after entering the lower voltage regulation limit of 27.3 V as shown in
figure 3.
g. In the current limit mode, the frequency of oscillation of the dc voltage shall have a
period of less than 14 ms (see t in figure 3) and a peak-to-peak value (see v in
figure 3) of less than 10 percent of the dc voltage.
3.9.5 Overvoltage. The regulator shall incorporate an overvoltage protection scheme to
protect the regulator-generator system from any failure in the regulator which will cause the
regulator to be turned "full on." The overvoltage portion of the regulator shall deactivate the
generator when the system voltage reaches a value of 33 ±1 V. Overvoltage reaction time shall
be not less than 0.25 second and not more than 1 second. This criteria shall be met with pin E of
the battery connector both grounded and ungrounded. Reset shall be manual and located on the
regulator (see 4.6.1.1.5).
3.9.6 Field excitation. The regulator shall be activated and begin to regulate when the
generator residual voltage increases above 0.7 V with pin E of the battery connector both
grounded and ungrounded (see 4.6.1.1.6).
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