Pacific Power Source UPC-3 - Page 55

SECTION 4 OPERATION
43
4.4.2.1 MIL-STD-704D TRANSIENT PROGRAMS (cont)
UNDER-FREQUENCY TRANSIENT (Program #103)
The power source will produce the under-frequency transient excursion as defined by MIL-STD-704D
(Paragraph 5.2.3.2.1). The power source must be configured for a voltage range of at least 115Vrms to
perform this test.
INITIAL CONDITIONS:
f
o
= 393 Hz. (Minimum Steady-State Limit)
V
a
, V
b
, V
c
= 115 VAC (Nominal Steady-State Value)
WFa=1, WFb=1, WFc=1
DIRECT COUPLED
TRANSIENT COMMAND SEQUENCE:
Segment 1:
F=375 Hz. Va=115, Vb=115, Vc=115, T=0.0002
Segment 2:
F=375, Va=115, Vb=115, Vc=115, T=1
Segment 3:
F=380, Va=115, Vb=115, Vc=115, T=0.0002
Segment 4:
F=380, Va=115, Vb=115, Vc=115, T=4
Segment 5:
F=390, Va=115, Vb=115, Vc=115, T=0.0002
Segment 6:
F=390, Va=115, Vb=115, Vc=115, T=5