Supply; Connecting A Replacement T1600 Three-Input 240-A Power Supply - Juniper T1600 Hardware Manual

Copyright © 2010, Juniper Networks, Inc.

Connecting a Replacement T1600 Three-Input 240-A Power Supply

To connect a three-input 240-A power supply to the power sources:
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Verify that a licensed electrician has attached cable lugs to the power cables that you
2.

supply.

Verify that the voltage across the DC power source cables leads is 0 V and that there
3.
is no chance that the cables might become active during installation. If needed, switch
off the customer site circuit breakers.
Verify that the circuit breakers on the power supply faceplate are in the
4.
position ( ).
O
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Remove the nut and washer from each power terminal stud.
6.
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.
Attach the lugs on the DC source power cables to the terminal studs.
7.
Attach the positive (+) DC source power cable lugs to the
a.
terminals.
Attach the negative (–) DC source power cable lugs to the
b.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see
Figure 153 on page 268). Use a 7/16-in. (11-mm) nut driver to tighten the nut. Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
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 in-lb (5.0 Nm).
Chapter 17: Replacing T1600 Router Hardware Components
RETURN
–48V
OFF
and to indicate
(+) (–)
(return)
(input) terminals.
267