•
Configuring DC Power on a T4000 Router on page 148
•
T4000 DC Power Electrical Safety Guidelines on page 320
•
T4000 DC Power Cable and Lugs Specifications on page 341
Connecting DC Power to the T4000 Router (Four 60-A Inputs)
You connect DC power to the router by attaching power cables from the DC power sources
to the terminal studs on the power supply faceplates. You must provide power cables
(the cable lugs are supplied with the router).
CAUTION:
Do not use a terminal jumper for 60-A DC power cables. Using a
terminal jumper is not supported for this procedure. Doing so will cause a
short across the inputs and trip your external circuit breaker.
CAUTION:
All connected inputs on the DC power supply in slot PEM0 must
be powered by dedicated power feeds derived from feed A, and all connected
inputs on the DC power supply in slot PEM1 must be powered by dedicated
power feeds derived from feed B. This configuration provides the commonly
deployed A/B feed redundancy for the system.
CAUTION:
You must use an appropriate torque-controlled tool to tighten
the nuts. Applying excessive torque damages the terminal studs and the
power supply. The absolute maximum torque that may be applied to this nut
is 45 lb-in. (5.0 Nm).
CAUTION:
You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
(+)
and
(–)
to indicate
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:
We recommend that the positive (+) DC source power cables to be
connected to the RTN (return) terminals be 2.6 in. (6.6 cm) longer than the
negative (–) DC source power cables to be connected to the –48 V (input)
terminals.
Copyright © 2013, Juniper Networks, Inc.
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