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|  MIL-P-2249C(OS)
3.3.2.8 Loss-of-phase protection. Protection against damage to the
power supply due to the loss of any one of the 3-phase inputs shall be
3.3.2.9 Series operation. The power supply shall be so designed and
constructed that the outputs of two units may be connected series-additive
to obtain an output voltage equal to the sum of the output voltages of the
individual power supplies. For series operation, no interconnection
except the series connection of output terminals shall be required.
NOTE
When operating two power supplies with
series-connected output circuits, the
output voltage controls shall be varied
simultaneously to approximately balance
the voltage and load between the two
units.
3.3.2.10 Current limiting. The power supply shall incorporate a con-
tinuous current limiting circuit to limit the current to 115 amperes plus
0 minus 15 amperes in the HIGH voltage range, and 230 amperes plus 0 minus
30 amperes in the LOW voltage range, and shall automatically restore the
output voltage to its original preset value upon removal of the overload.
3.3.2.11 The power supply shall operate as specified herein for any
combination of resistive. reductive, capacitive, or rotating inverter
(direct current to alternating current motor-generator set) load with-
in the specified load rating of the power supply. Specifically, it
should be compatible with Torpedoes Mk 37, 44, 45, and 46 and their as-
sociated test equipment.
minor maintenance or repair.
3.3.2.13 Operating temperature. With the unit operating in an ambient
temperature of 77 degrees Farenheit (i), no exposed parts of the equip-
ment, including the enclosure, shall under any condition of operation
achieve a temperate in excess of 130 degrees F. The front panels and
operating controls shall not exceed 100 degrees F.
3.4 Environmental requirements
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