Juniper SRX5400 Hardware Manual page 156

SRX5400 Services Gateway Hardware Guide
142
Remove the nuts and washers from the terminal studs.
8.
Secure each power cable lug to the terminal studs, first with the washer, then with
9.
the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each
nut. (see Figure 62 on page
Attach the positive (+) DC source power cable lug to the
a.
Attach the negative (–) DC source power cable lug to the
b.
Figure 62: Connecting DC Power
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
NOTE: The DC power supplies in
dedicated power feeds derived from feed A, and the DC power supplies
in PEM2 and
from feed B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
Replace the clear plastic cover over the terminal studs on the faceplate.
10.
Route the power cables along the cable restraint toward the left or right corner of the
11.
chassis. If needed to hold the power cables in place, thread plastic cable ties, which
you must provide, through the openings on the cable restraint.
142).
PEM0
PEM3 must be powered by dedicated power feeds derived
RTN (return) terminal.
(input) terminal.
–48V
(+) and (–) to indicate
and must be powered by
PEM1
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