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|  MIL-D-81347C(AS)
AC Over Voltage - The input voltage transients shall remain
3.3.12.1.2
within limits 1 and 2 of MIL-STD-704, Figure 3, for normal and abnormal operating conditions.
.
AC Under Voltage - The input voltage transients shall remain
3.3.12.1.3
within limits 3 (as modified herein) and 4 of MIL-STD-704, Figure 3, for normal and abnormal
operating conditons.
Loss Of Power - No damage shall result from accidental or
3.3.12.1.4
deliberate stoppage of electrical power to the equipment regardless of the time in its operating cycle
that such a stoppage should occur, and regardless of the time interval that elapses before power is
restored.
DC Power - The use of 28 Volts DC aircraft power is specifi-
3.3.12.1.5
cally prohibited, except where specified as a requirement.
Power Supply Subunit - Each unit of the system shall have a
3.3.12.2
power supply subunit which shall meet the requirements of MIL-STD-704, as modified herein.
Power Control Switch - A power control switch for activating
3.3.12.2.1
and deactivating each power supply shall be supplied, except for keysets and panels.
Overload Protection - The power supply shall be protected from
3.3.12.2.2
external overload conditions including short circuiting.
Over Voltage Protection - The power supply shall provide over
3.3.12.2.3
voltage protection to the DPS under both normal and abnormal operation conditions. When normal
operation is affected by an over voltage condition, indication of such a condition shall be provided.
Under Voltage Protection - The power supply shall provide
3.3.12.2.4
under voltage protection to the DPS for both normal and abnormal operating conditions. When norrmal
operation is affected by an under voltage condition, indication of such a condition shall be provided.
Power Supply Output Conditions (Excluding the Magnetic Drum
3.3.12.2.5
Memory)
Voltage
DPS Operating Limits
Regulation
+5 VDC
5%
1 10%
5%
10%
-10 VDC
3.3.12.2.6
Normal Operation - The equipment shall operate under normal
electric-system operation of MIL-STD-704, Section 6 except as specified herein.
Protective Devices - Circuit breakers shall be used in lieu of
3.3.12.2.7
fuses whenever possible. All circuit breakers shall be accessible without removing equipment from
racks. Fuses, if used, shall be of types and ratings readily available from Navy supply,
Overtemperature Sensor - Each logic unit power supply excluding
3.3.12.2.8
the Magnetic Drum Memory Subassembly power supply shall contain thermal sensing circuitry to detect
the maximum safe operating temperature and provide a signal to the aircraft power distribution sys-
tem. The overtemperature signal shall be used by the airframe contractor to provide a warning to the
TACCO Station operator that the respective Logic Unit is operating beyond the upper design thermal
limit. The logic unit shall not automatically shut down as a result of the overtemperature sensor.
10
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