•
Secure the positive (+) DC source power cable lug to the RTN terminal.
•
Secure the negative (–) DC source power cable lug to the –48 V terminal.
CAUTION: Ensure that each power cable lug seats flush against the surface of the terminal block
as you tighten the nuts. Ensure that each nut is properly threaded into the terminal stud. Before
tightening each nut that you insert into the terminal stud, ensure that you are able to spin the nut
freely with your fingers. Applying installation torque to the nut when improperly threaded might
damage the terminal stud.
CAUTION: The maximum torque rating of the terminal studs on the DC power supply is 36 lb-in.
(4.0 Nm). Excessive torque can damage the terminal studs. Use only a torque-controlled driver or
socket wrench to tighten nuts on the DC power supply terminal studs.
NOTE: The DC power supplies in PEM0 and PEM1 must be powered by dedicated power feeds derived
from feed A, and the DC power supplies in PEM2 and PEM3 must be powered by dedicated power feeds
derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the
system.
7. Replace the clear plastic cover over the terminal studs on the faceplate.
8. Verify that the power cabling is correct. Ensure that cables do not touch or block access to switch components, and
do not drape where people could trip on them.
9. Switch on the dedicated customer site circuit breakers and verify that the INPUT OK LED on the power supply is lit
green.
10. Set the power switch of the DC power supply to the ON (—) position and verify that the PWR OK, BRKR ON, and
INPUT OK LEDs are steadily lit green.
6
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