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PS 123 12 VDC, 3 Amp Power Supply • User's Guide
PS 123, cont’d
6
PS 123 12 VDC, 3 Amp Power Supply • User's Guide
7
7. From the rear panel end, pull the EMT plate (see figure 3)
out of the enclosure.
8. Thread the 18-gauge power wires through the length of the
electrical conduit tube.
9. Install the EMT adapter plate (figure 1,
c
, on page 1)
(with conduit attached) into the opening from which you
removed the EMT plate in step 7. Use the Phillips head
screws (figure 3) that you removed in step 2 to attach the
adapter plate.
10. Slide the conduit nut (figure 6, below) over the bundle of
wires exiting the conduit and onto the conduit itself inside
the PS 123. Hand-tighten the nut.
Tie Wrap
Neutral Terminal
Ground Wire Nut
Terminal Block
Conduit Nut
Hot Terminal
Metal Tab
Figure 6 — Terminal block and conduit wiring
11. Attach and screw down the hot and neutral wires exiting
from the conduit to their corresponding screws on the
terminal block.
W
Ensure that you observe wire polarity. Figure 6
shows the location of the neutral and hot poles on
the mother board connector. The conduit wiring
harness' neutral wire is identified with a tag marked
"N" (neutral).
12. Attach the ground wire from the conduit to the PS 123's
bare metal plate bottom, securing it by reattaching the
ground wire nut.
13. Thread a tie wrap through the metal tab on the bare metal
bottom of the PS 123, place all the wires within its cradle,
and zip the tie wrap over the bundle of wires.
14. Retighten the conduit nut from step 10 (figure 6 above) to
ensure that it firmly secures the conduit EMT adapter plate
to the power supply.
15. Use the six screws you removed in step 3 to secure
the top cover of the PS 123 back onto its bottom board
(figure 4 on page 5).
Output power — wiring the DC output connectors
The PS 123 can power multiple products through its 3.5 mm,
2-pole captive screw connectors.
N
For applications in which power supply voltage
is critical, verify the power cord’s polarity before
connecting it by plugging in the power supply with no
load. Check the output with a voltmeter.
W
If you are verifying power supply polarity with a
voltmeter, the two power cord wires must be kept
separate while the power supply is plugged in.
To connect products to the outputs of the PS 123, do the
following:
1. Cut the DC output cord to the length required.
2. Strip the jacket of the conductor wire to expose 5/16"
(7 mm) of the wire (figure 7).
Power Supply
Output Cable
Orange Captive Screw
Connector
Black Wire
White Wire
Power Supply
Output Cord
Orange Captive Screw
Connector
SECTION A–A
Ridges
Smooth
A A
2-Pole Orange
Captive Screw
Connector
(12V)
RS-232 Connector Wiring
3-Pole Captive Screw
Connector
(15V)
2-Pole Direct Insertion
Captive Screw
Connector
(15V)
Blue Captive
Screw Connector
(no center block)
Tip
See Warning
Sleeve (s)
Tip
See Warning
Receive
Transmit
Ground
Tie Wrap
Tie Wrap
RS-232
OVER FIBER
Tx Rx NA
5-pole Captive Screw
Connector
3-pole Captive Screw
Connector
18 Gauge (thick) wire is stripped to 7mm
22 Gauge (thin) wire is stripped to 5mm
POWER
AUDIO / RS-232
Figure 7 — Power connector wiring
W
The ideal length of exposed wire is 5/16"
(7 mm). Exposing more than the specified length
of the copper wires could allow the stripped wires to
touch each other, causing a short circuit. This could
result in the external DC power supply overheating
and/or burning.