Extron Electronics PS 123 - Manual (Page 7)

PS 123 12 VDC, 3 Amp Power Supply • User's Guide
PS 23, cont’d
PS 123 12 VDC, 3 Amp Power Supply • User's Guide
W Installation and service must be performed by a
qualified electrician only.
C A UL listed electrical distribution box is
recommended for the termination of the conduit
opposite the PS 123 power supply. See "UL
requirements," below.
UL requirements
The Underwriters Laboratories (UL) requirements listed below
pertain to the installation of the flexible conduit onto a PS 123
power supply.
• This unit is not to be used beyond its rated voltage range.
• This unit must be wired to a UL listed distribution box.
N The UL approved electrical distribution box is not
included with either the PS 123 power supply or the
Flexible Conduit Adapter Kit; the installer is responsible
for obtaining and installing the box.
• This unit must be installed in accordance with the National
Electrical Code and with all local codes.
Installing the flexible conduit cable
Install the flexible conduit cable assembly to the PS 123 as
follows:
1
. Unplug the IEC power cord.
2 . Remove and retain the two Phillips head screws that
secure the EMT plate (figure 3, below) to the PS 123 rear
panel.
OUTPUTS
RED-
OVERLOAD
12 VDC TOTAL OUTPUT 3A
100-240 50/60Hz 1A MAX.
Remove two screws.
EMT Plate
Figure 3 — Removing the EMT plate
3 . Remove and retain the six screws that connect the top
cover of the PS 123 to its bottom board (figure 4, on the
next page).
RE D-O VE RL OA D
P/S 123
12 V DC 3A PO WE R S UPP LY
Remove three
screws on
each side.
Lift the cover
straight up.
Figure 4 — Removing the top cover
4 . Carefully lift the top cover up, taking care not to remove it
completely.
C Rough handling of the top cover can tear the wiring
that connects the front panel LED.
5 . Use the Phillips head end of an Extron Tweeker or a small
standard screwdriver to loosen the screws holding the hot
and neutral wires on the side of the terminal block nearest
the EMT plate opening (figure 5).
Hot Terminal
Neutral Terminal Ground Wire Nut
Terminal Block
Figure 5 — Terminal block and IEC wiring
6 . Unscrew the EMT plate ground wire from the ground wire
nut on the bare metal bottom of the PS 123 enclosure.