Related
Documentation
Tools and Parts Required to Provide Power to the T640 Router on page 219•
• Connecting DC Power to the T640 Router (Four 60-A Inputs to Six-Input DC Power
Supplies) on page 236
• Connecting DC Power to the T640 Router (Six 60-A Inputs to Six-Input DC Power
Supplies) on page 227
• Powering On the T640 Router
• Configuring DC Power on a T640 Router on page 255
• Troubleshooting the T640 Power System on page 476
• T640 DC Power System Requirements on page 128
• T640 General Electrical Safety Guidelines and Electrical Codes on page 529
• T640 DC Power Cable and Lug Specifications on page 132
• Site Electrical Wiring Guidelines for Juniper Networks Devices on page 538
Connecting DC Power to the T640 Router (Four 60-A Inputs to Six-Input DC Power
Supplies)
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 dedicatedpower feeds derived from feedA, 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
Copyright © 2017, Juniper Networks, Inc.236
T640 Core Router Hardware Guide
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