MIL-PRF-62368C(AT)
3.4.14 Voltage transient. The motor shall withstand voltage transients as specified in
operating and non-operating modes (see 4.5.16).
3.4.14.1 Operating mode.
3.4.14.1.1 Combined generator-battery power supply.
3.4.14.1.1.1 Steady-state voltage. Circuit steady-state voltage shall be between 25 and
30 V.
3.4.14.1.1.2 Ripple. The upper and lower peaks of ripple voltage (see figure 1), shall be
less than 2 V. The frequency components of the ripple shall be within the range of 50 Hz to
200 kHz.
3.4.14.1.1.3 Surges. All surges resulting from system operation shall fall within the loci
shown in figure 2.
3.4.14.1.1.4 Spikes. All spikes resulting from system operation shall fall within the loci
shown in figure 3.
3.4.14.1.1.5 Starting disturbances. Fully charged battery shall be used (battery drawing
less than 5 A from a 28 V charging source with electrolyte temperature between 81 degrees
Fahrenheit (°F) and 100 °F (27 degrees Celsius (°C) and 38 °C).
3.4.14.1.1.5.1 Initial engagement surges. During this disturbance, the voltage shall not
be below 6 V and the duration shall not exceed 1 second.
3.4.14.1.1.5.2 Cranking level. The steady voltage during cranking shall not be below
16 V (no more than 3 cranking attempts of 30 seconds each with 2-minute cranking level pauses
between attempts). This characteristic applies to starting the second engine of a multi-engine
vehicle, or slave starting another vehicle.
3.4.14.1.2 Generator only (no battery, single fault condition).
3.4.14.1.2.1 Steady-state voltage. The voltage shall be less than 33 V.
3.4.14.1.2.2 Ripple. The upper and lower peaks of ripple voltage (see figure 1) shall
each be less than 7 V. The frequency components of the ripple shall be within the range 50 Hz
to 200 kHz.
3.4.14.1.2.3 Surges. All surges resulting from system operation shall fall within the loci
shown in figure 4. (A lower steady-state limit of 23 V shall be used to establish the recovery
time of negative-going surges.)
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