Connecting Dc Power To A T640 Router With Three-Input 240-A Dc Power Supplies (2-Input Mode) - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Connecting DC Power to a T640 Router with Three-input 240-A DC Power Supplies
(2-INPUT Mode)
126
General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and
T Series Routers on page 324
Site Electrical Wiring Guidelines for M Series and T Series Routers on page 346
To connect the DC source power cables to the T640 router:
Ensure that the voltage across the DC power source cable leads is 0 V and that there
1.
is no chance that the cable leads might become active during installation.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Verify that the input mode switch is correctly set to
3.
Input Mode Switch on a Three-Input 240-A DC Power Supply for a T640 Router" on
page 247.
Replace the cable restraint, if needed. See "Replacing the T640 Cable Restraint on a
4.
Three-Input 240-A DC Power Supply" on page 249.
Switch the circuit breakers on the power supply faceplate to the
5.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Remove the nut and washer from the power terminal studs for
7.
is not supported for the T640 router. If no washers and nuts are already
INPUT 2
installed, they should be in the accessory box.
Secure the cable lug on the DC power cable to the terminal studs for
8.
, first with a washer, then with a nut (see Figure 73 on page 127). Use a 7/16-in.
INPUT 1
(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: INPUT 0
in slot
PEM0
feed A, and
INPUT 0
in slot must be powered by dedicated power feeds derived from feed
PEM1
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
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
and INPUT 1 on the three-input 240-A DC power supply
must be powered by dedicated power feeds derived from
and on the three-input 240-A DC power supply
INPUT 1
is not used for the T640 router.
INPUT 2
mode. See "Setting the
2–INPUT
position (
OFF
INPUT O and INPUT 1
INPUT O
(return) terminal.
RTN
(input) terminal.
–48V
(+) and (–) to indicate
Copyright © 2010, Juniper Networks, Inc.
).
O
.
and