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|  MIL-N-81497A(AS)
Contents of Unit - The Power Supply shall contain the
3 .5.6.4
following major subassemblies.
Nomenclature
Quantity
Input 3 Phase, 400 Hz Transformer
1
Single Phase, 400 Hz Transformer
1
Battery
1
Battery Switch Circuit
1
Three Transformer Inverter Unit
1
l5 V DC- A Post Regulator
1
15.4 V DC - B Post Regulator
1
15 V DC- C Post Regulator
1
5.6 V DC - A Post Regulator
1
+ 5.6 V DC - B Post Regulator
1
26 V DC Post Regulator
1
+ 28 V DC - A Post Regulator
1
+28 V DC Regulator
1
RFI Filters
as required
BITE Circuitry
1
Exposed Test Points
20
Relay and Logic Circuitry
as required
Battery Trickle Charge Circuitry
1
Battery Requirements - The Power Supply shall contain
3.5.6.5
a nickel cadmium battery which shall be used to provide output power
in the event of aircraft 400 Hz power interruption or abnormal power tran-
sient condition. The battery shall be capable of delivering maximum
power of a 10 SEC period for a minimum of 12 cycles each of 10 SEC
duration with a 12 hour interval. An interval between power interruptions
defining a cycle, shall be 45 MIN. The battery shall accept a trickle
charge from the Power Supply.
Transfer Operation - The Power Supply shall sense
3.5.6.5.1
the 115 V, 400 Hz, 3 phase input power and shall automatically switch
to battery power. Circuitry shall be provided to insure that the DC
output voltages remain within the limits required.
49
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