MIL-PRF-62539A
3.2 Design, Materials, and manufacturing processes. Unless otherwise specified, the
design, materials, and manufacturing process selection shall be the prerogative of the contractor
as long as all articles submitted to the government fully meet the operating, interface, ownership
and support , and operating environment requirements specified.
3.3 Operating requirements. Each module shall provide the following functional,
operational, and performance capabilities.
3.3.1 Performance. The module shall perform as specified herein through the range of
0-34 volts (V) direct current (dc). Nominal battery voltage to the module shall be 24 V dc.
Voltage measurements shall be relative to ground.
3.3.1.1 Battery voltage sensing. The module shall permit continuous variable voltage up
to 34 V dc from the battery to the starter. Continuity shall be provided between pins B and D
when voltage greater than 11.75 ± 1 V dc is applied to pin A with the module grounded. When
less than 11.75 ± 1 V dc from the battery is applied to pin A, continuity between pins B and D
shall be interrupted after a 500 ± 50 millisecond (ms) delay. Momentary fluctuations down to
below the "break" point, as low as 5 V dc during the 500 ms delay shall not cause continuity
between pins B and D to be interrupted. When continuity between pins B and D is interrupted due
to low voltage, it shall be re-established and maintained only by removing the power from pin A
for 2 ± 1 seconds (s) and applying voltage greater than 11.75 ± 1 V dc again to pin A.
3.3.1.2 Generator voltage sensing. Continuity between pins C and D shall be prevented
when voltage applied to pin C is greater than 17 ± 1 V dc. When continuity between pins B and D
has been stopped because of high voltage at pin C, the module shall be reset by removing power
from pins A and C for 2 ± 1 s and applying voltage greater than 11.75 ± 1 up to 34 V dc to pin A.
3.3.1.3 Power rating. The module shall withstand a continuous current draw of
50 amperes (A) and withstand surges to 100 A (at 24 V dc) through pins B and D.
3.3.1.4 Polarity protection. Performance shall not be impaired by an incident of reverse
polarity when the module is operated with a negatively grounded electrical system utilizing
electrical storage batteries.
3.3.1.5 Time delay. When 12 V dc or less are applied to pin A with the case grounded,
there will be a time delay of 500 ms before interruption of continuity between pins B and D
3.3.1.6 Starter switch bounce. The module shall function normally when a signal that has
a simulated switch wave form is applied to pin A.
3.3.1.7 Dielectric strength. Leakage of current through circuit insulation to ground shall
not be greater than 100 mA when 1000 volts root mean square (V rms) are applied between the
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business