MIL-DTL-24765A(NAVY)
4.6.21 Power rating. The power rating of the UPS shall be verified when operated at rated input voltage and
frequency for 1 hour with each of the following loads:
a.
For AC output:
(1) Rated-load, 0.7 p.f. lagging
(2) Rated load, unity p.f.
b.
For DC output: rated-load.
The UPS operation shall be as specified herein.
4.6.22 Operating time on battery. The operating time on battery shall be determined with the UPS input power
off and output supplying rated load (0.8 p.f. lagging for AC outputs). The UPS operation shall be as specified
herein.
4.6.23 Efficiency. The battery of the UPS shall be fully charged and the input voltage and frequency shall be at
nominal rated values. Efficiency of the UPS shall be measured for 50 percent load and rated-load (0.8 p.f. lagging
for AC output). The UPS operation shall be as specified herein.
4.6.24 Over-current protection. The UPS shall be operated at rated input voltage and frequency. For UPS with
AC output, the load shall be at unity power factor.
a. The UPS shall maintain rated output voltage during this period. The operating time before transfer to UPS
by-pass shall be determined for load currents of 125 percent, 200 percent, and 230 percent.
b. The UPS may reduce output voltage and may limit output current to 230 percent during this period. The
operating time before transfer to UPS by-pass shall be determined for a load current of 250 percent.
The UPS operation shall be as specified herein.
4.6.25 Transfer time. The UPS shall be operated with rated input voltage, frequency, and rated-load (0.8 p.f.
lagging for AC outputs). The transfer time shall be determined when input power is shut off. The UPS operation
shall be as specified herein.
4.6.26 Low voltage shut down. The UPS shall be operated with rated input voltage, frequency, and rated-load
(0.8 p.f. lagging for AC outputs). The output voltage shall be determined when the battery capacity is depleted and
shut down occurs. The UPS operation shall be as specified herein.
4.6.27 Leakage current. The UPS shall have all input and output (when present) EMI capacitors (if they are
connected to the ship's ground potential) disconnected. The leakage current for each EMI capacitor shall be
determined at 60 Hz. The UPS operation shall be as specified herein.
4.6.28 Shock. The UPS shall be subjected to a Class I, Type A shock test in accordance with MIL-S-901.
Shock test mounting shall be as specified (see 6.2). The equipment shall be energized and operated at the rated-load
(0.8 p.f. lagging for AC outputs) during the shock test. The UPS operation shall be as specified herein during and
after shock without breakage of parts including mounting bolts.
4.6.29 Vibration. The UPS shall be subjected to the vibration test in accordance with MIL-STD-167-1. The
equipment shall be energized and operated at rated-load (0.8 p.f. lagging for AC outputs). The UPS operation shall
be as specified herein during and after vibration without breakage of parts including mounting bolts.
4.6.30 Airborne noise. Airborne noise measurements shall be obtained with the UPS operated at rated input
voltage and frequency and rated-load (0.8 p.f. lagging for AC outputs). The UPS operation shall be as specified
herein.
4.6.31 Structureborne noise. Structureborne noise measurements shall be obtained with the UPS operated at
rated input voltage and frequency and rated-load (0.8 p.f. lagging for AC outputs). The UPS operation shall be as
specified herein.
4.6.32 Electromagnetic interference emission and susceptibility. The UPS shall be tested in accordance with
the applicable tests of MIL-STD-461. UPS operation shall be as specified herein.
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