Juniper T640 Hardware Manual page 154

T640 Core Router Hardware Guide
Related
Documentation
Connecting DC Power to a T640 Router with Two-Input 160-A DC Power Supplies
124
Electrostatic discharge (ESD) grounding wrist strap
Overview of Connecting the T640 Router to Management and Alarm Devices on page 117
Connecting DC Power to a T640 Router with Two-Input 160-A DC Power Supplies on
page 124
Connecting DC Power to a T640 Router with Three-input 240-A DC Power Supplies
(2-INPUT Mode) on page 126
Connecting DC Power to a T640 Router with Four-Input 240-A DC Power Supplies on
page 128
Connecting AC Power to a T640 Router with Three-Phase Wye AC Power Supplies on
page 133
Connecting AC Power to a T640 Router with Three-Phase Delta AC Power Supplies
on page 131
General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and
T Series Routers on page 324
To connect the DC source power cables to each power supply in the T640 router:
Switch off the dedicated customer site circuit breakers. Follow the instructions for
1.
your site. Ensure that the voltage across the DC power source cable leads is 0 V and
that there is no chance that the cable leads might become active during installation.
Switch the circuit breakers on the power supply faceplate to the off position (
2.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
3.
Remove the nut and washer from each power terminal stud. If no washers and nuts
4.
are already installed, they should be in the accessory box.
Secure the cable lug on the DC power cable to the terminal stud, first with a washer,
5.
then with a nut (see Figure 72 on page 125). Use a 7/16-in. (11 mm) nut driver or wrench
to tighten the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque
to each nut:
Secure each positive (+) DC source power cable lug to a
a.
Secure each negative (–) DC source power cable lug to a
b.
NOTE: All inputs on the two-input 160-A DC power supply in slot
must be powered by dedicated power feeds derived from feed A, and all
inputs on the two-input 160-A DC power supply in slot
powered by dedicated power feeds derived from feed B. This configuration
provides the commonly deployed A/B feed redundancy for the system.
O
(return) terminal.
RTN
–48V (input) terminal.
PEM0
PEM1 must be
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).