Section II. INSTALLATION INSTRUCTIONS
when using the PP-4763/GRC. Connect the
2-3. Suitable location
power cable to either a single-phase 115-volt,
Caution: Do not operate the equipment if
50- to 60-cps source, or a single-phase, 230-
there is evidence of water inside the cabinet.
volt, 50- to 60-cps source when using the
The power supply is designed to operate within
P P 4 7 6 3 A / G R C . After determining which
a sheltered location protected from the ele-
power source will be used, secure the ac input
ments. It is not designed to operate in rain,
links in the correct position for the selected
snow, or ice, or where surrounding tempera-
input power as illustrated in figure 2-2. For
ture exceeds 55 CH.
115-volt power, secure the links as shown in
2-4. Connections
as shown in figure 2-2. Note that in the 230-
volt position, both links are fastened (in paral-
Warnings:
lel) across the two center terminals and se-
1. The metal cabinet must be grounded at
cured. A connector is mounted on the power
all times when it is connected to an ac source.
cable to connect the PP-4763A/GRC to the ac
The PP-4763A/GRC is grounded by the ac
p o w e r supply; the power cable for the
power cable when the ac power cable is plugged
PP4768/GRC maybe connected directly to the
into an ac outlet. The ac power cable supplied
ac power supply as follows:
with the PP-4763/GRC includes a ground
(1) Connect the white wire to the
(GRD) wire for this push The AC ON-OFF
grounded ac terminal.
switch must be set to OFF before the power
(2) Connect the black wire to the un-
supply is connected.
grounded ac terminal.
2. Be careful when working on the 115-or
(3) Connect the GRD wire to a good earth
230-volt ac line connections Serious injury or
ground.
DEATH may result from contact with them
c. Remove the rear panel access plate to ex-
terminals,
pose the dc output terminals (fig. 2-2).
3. Low-voltage, high-amperage current is
Caution: Be sure to observe correct
present at output connections and at connec-
polarity; for example (+) output terminal to
tions inside the equipment. Do not touch con-
(+) load terminal; (-) output terminal to
nections or remove the cabinet cover until the
(-) load terminal.
equipment is removed from power source. Re-
d. Connect two dc leads with -inch lugs
energize the power supply before connecting
capable of carrying 50-ampere current (or the
or disconnecting the equipment to be powered.
current requirements of the load connected) to
a. Turn the AC ON-OFF switch (fig. l-l)
t h e power supply output terminals. The
to OFF.
PP-4763A/GRC is provided with dc output re-
Caution: Measure the available ac supply
ceptacle J1 at the rear panel (fig. 2-2), and ei-
voltage, to determine whether it is 115-or 230-
ther the output terminals or output receptacle
volts ac.
J1 may be used.
b. Connect the three-wire, ac power cable to
e. Replace the access panel and tighten the
a single-phase, 115-volt, 50- to 60-cps source
cable clamps.
2-3
