MIL-DTL-24765A(NAVY)
4.6.13 Steady-state nonlinear load. The UPS shall be operated at nominal input voltage and a balance
nonlinear load. The test shall be run with DC loads equal to 25, 50, 70, and 100 percent of the rated UPS capacity.
A second series of tests shall be run with loads consisting of equal 0.8 (lagging) p.f. and nonlinear loads at 25, 50,
70, and 100 percent of rated UPS capacity. UPS operation shall be as specified herein.
4.6.14 Transient output voltage and recovery. With the UPS operating with nominal input, a balanced three-
phase load of 0.8 p.f. shall be changed in one step for the following conditions:
a.
From no-load to ½-load.
b.
From ½-load to rated-load.
c.
From rated-load to ½-load.
The UPS operation shall be as specified herein.
4.6.15 Amplitude and frequency modulation. The UPS output voltage amplitude and frequency modulation
shall be determined for test conditions as specified in 4.6.12. The UPS operation shall be as specified herein.
4.6.16 Output voltage waveform. The harmonic content and output voltage spikes shall be determined. For
first article, this test shall be performed with the UPS operating under the TC# 1, 2, 7, and 11 as specified in table
IV. For conformance test, this test shall be performed under the TC# 2 and 7 as specified in table IV. The UPS
operation shall be as specified herein.
4.6.17 Output phase displacement angle. The UPS output displacement angle shall be measured at the output
terminals. For first article and conformance tests, this test shall be performed for TC# 2 as specified in table IV.
The UPS operation shall be as specified herein.
4.6.18 Output voltage balance under balanced load. After the UPS has been stabilized at rated-load, the output
voltage of each phase at the UPS output terminal shall be determined. For first article test, this test shall be
performed for TC# 2 and 3as specified in table IV. For conformance test, this test shall be performed for TC# 2 as
specified in table IV. The UPS operation shall be as specified herein.
4.6.19 Output voltage balance under unbalanced load. For the three-phase UPS, the UPS shall be operated
with rated input. The output voltage unbalance shall be determined under the conditions of table I. UPS operation
shall be as specified herein.
4.6.20 Output voltage regulation (DC). The UPS shall be connected to an input whose voltage and frequency
can be varied. After the UPS has been stabilized at load, the output steady-state voltage regulation shall be
determined for the test conditions (TC# 1-10) specified in table V.
TABLE V. Conditions of input and output.
Input
Output
TC#
Voltage & frequency
Rated load (percent)
Max.
Nom.
Min.
0
50
100
125
1-3
X
-
-
X
X
X
-
4-6
-
X
-
X
X
X
-
7-9
-
-
X
X
X
X
-
10
-
X
-
-
-
-
X
The UPS operation shall be as specified herein.
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