TM 11-6130-243-35
TM6130-243-35-1
Power Supply PP-4606/G block diagram.
(not shown on fig. 1-2) to each parallel-con-
nected pair of primary windings in each leg of
the wye. VOLTAGE ADJUST switch S2 con-
a. The power supply is designed to operate
trols the voltage in the secondary windings of
from either 220- or 440-volt, 60-cycle, 3-phase
transformer T1 by controlling the number of
power mains. To provide for correct connec-
turns energized in the primary windings. (En-
tion of the power mains to the primary wind-
ergized turns decrease and secondary winding
ings of input power transformer T1, a tap
voltages increase as switch S2 is turned clock-
board is provided on the rear of the power
wise.)
supply. Wire links are connected between
specific terminals on the tap board, depend-
c. When the power supply is arranged to
operate with 440-volt input power, wire links
ing upon the voltage of the power mains from
which the power supply is to be operated. Fig-
are connected between a different group of
ures 1-2 and 1-3 are simplified schematic dia-
specific terminals on the tap board as shown
grams that show how the primary windings
are wye-connected to the power mains. Refer
six primary windings of input transformer T1
are now series-connected into a wye configu-
while studying the two simplified schematic
ration. When circuit breaker switch CB1 is at
diagrams. For simplicity, VOLTAGE AD-
POWER ON, input power is routed from the
breaker
440-volt terminals of the circuit
JUST switch S2 is not shown on the simplified
schematic diagrams; however, assume that it
through the wire links on the terminal board
is at the fully clockwise position (HIGH) for
and the VOLTAGE ADJUST switch (not
the discussions in b and c below.
pair of primary windings in each leg of the
b. When the power supply is arranged to
wye.
operate with 220-volt input power, wire links
are connected between specific terminals on
the tap board as shown by the short heavy
a. The output circuit includes the three sec-
nected into a wye configuration which corre-
ondary windings of power transformer T1,
sponds to the wye configuration of the input
diode rectifiers CR1 through CR6, surge-sup-
power mains. When circuit breaker switch
pressor capacitors C3 through C8, bleeder re-
CB1 is at POWER ON, input power is routed
sistors R1 and R2, choke L1, and filter capaci-
from the 220-volt terminals of the circuit
tors C1 and C2. The secondary windings of the
breaker through the wire links on the tap
board and the VOLTAGE ADJUST switch