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 TM 11-6125-259-30
ab. Calculate the power-out in watts using the
j. Set switches S2, 3, 4, 12, 13, 14, 22, 23 and 24 to
following formula:
the up (on) position (250 VA, Unity P.F. Loads) and
repeat b through i above.
2
2
2
A V OUT B V O U T
C V OUT = PO U T
k. Set switches S2, 3, 4, 12, 13, 14, 22, 23 and 24
5 3 . 8 1 + 53.81 +
53.81
to the down (off) position and switches S7, 8, 9, 17,
ac. Calculate the pencent inverter efficiency using
18, 19, 27, 28 and 29 to the up (on) position (260 VA,
the following formula:
.8 P.F. Lagging Loads) and repeat b through i
POUT (step bb)
above.
% Efficiency=
x 100
l. Set switch S2 to the Up (on) position, switches
PIN (step Y)
S7, 8, 9, 17, 18, 19, 27, 28 and 29 to the down (off)
The inverter efficiency shall be 65 percent minimum.
position, and DELTA/1/WYE switch S21 to WYE
ad. Set PHASE CURRENT switch S11 and
position.
OUTPUT MONITOR switch S16 to A position.
m. Set UNIT PWR switch S6 to ON position and
ae. Set 200% OL switches S5, 15 and 25 to the
apply 26 vdc input from the power supply.
up(on) position.
n. Set OUTPUT MONITOR switch S16 to A, B
af. Set UNIT PWR switch S6 to ON position and
and C positions respectively and at each position
apply 26 vdc input from the input power supply.
read the corresponding phase output voltage in-
ag. Set 200% RATED LOAD CURRENT switch
dicated on digital Voltmeter No. 4. The A, B and
S1 to the up(on) position.
C output voltages shall be between 110 and 120
ah. Before A output current foldback (digital
vrms.
voltmeter No. 3 reads 100 mV or less), measure the
o. Increase the input power supply voltage to 29
following A parameters. (The output current
vdc and repeat n above. Set UNIT PWR switch S6
foldback occurs in 5 to 15 seconds after switch S1 is
to OFF position.
set to 200% RATED LOAD position. If necessary,
p. Set switches S3, 4, 12, 13, 22, 23 and 24 to the
reset output overload condition to enable
up(on) position (Unbalanced, Unity P.F. Loads.
measurement of listed parameters.)
Repeat m, n and o above.
(1) Read output voltage as indicated on digital
q. Set switches S2, 3, 4, 12, 13, 14, 22, 23 and 24
voltmeter No. 4. The output voltage shall be 60
to the up(on) position (250VA, Unity P.F. Load). 1
vrms or less.
r. Set DELTA/1/WYE switch S21 to DELTA
(2) Read the output current equivalent
position.
millivolts (100 mV = 1 amp) as indicated on digital
s. Set UNIT PWR switch S6 to ON position and
voltmeter No. 3. The output current shall be 4.34
apply 28 vdc input from the input power supply.
amps or greater.
t. Set LAMP TEST switch S31 to LAMP TEST
(3) Read the output frequency as indicated on
position.
electronic counter. The output frequency shall be
u. Set TEST switch S26 to TEST position. The
between 393 and 407 Hz.
ACB and ABC, PHASE ROTATION indicators
ai. Set 200% RATED LOAD CURRENT switch
shall illuminate.
S1 to the down (off) position.
v. With TEST switch S26 in TEST position, set
aj. Set PHASE CURRENT switch S11 and
LAMP TEST switch S31 to down position. The
OUTPUT MONITOR switch S16 to B position.
ACB PHASE ROTATION indicator shall ex-
ak. Before B output current foldback (digital
tinguish and the ABC indicator shall illuminate.
voltmeter No. 3 reads 100 mV or less), measure the
w. Adjust input voltage between 27.5 and 28.5
following B parameters. (The output current
vdc as indicated on digital voltmeter No. 1. Note
foldback occurs in 5 to 15 seconds after witch S1 is
actual input voltage.
set to 200% RATED LOAD position. If necessary,
x. Using the digital voltmeter red the input
reset output overload condition to enable
current equivalent millivolts (1 mV = 1 amp) as
measurement of listed parameters.)
indicated on digital voltmeter No. 2 Record input
(1) Read output voltage as indicated on digital
current.
voltmeter No. 4. The output voltage shall be 50
y. Calculate input power in watts (PIN = VIN X
vrms or less.
IIN) and record result.
(2) Read the output current equivalent
z. Set OUTPUT MONITOR switch S16 to A, B
millivolts (100 mV = 1 amp) as indicated on digital
and C positions respectively and at each position
voltmeter No. 3. The output current shall be 4.34
read the corresponding phase output voltage (A
amps or greater,
VOUT , B, VOUT and C VOUT ) on digital volt-
(3) Read the output frequency as indicated on
meter No. 4. Record output voltages.
electronic counter. The output frequency shall be
aa. Set UNIT PWR switch S6 to OFF position.
3-17
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