Removing A T1600 Four-Input 240-A Dc Power Supply - Juniper T1600 Hardware Manual

T1600 Core Router Hardware Guide
270
power supply automatically assumes the entire electrical load for the router. If you have
only one power supply, you must power off the system before removing the power supply.
Removing a T1600 Four-Input 240-A DC Power Supply on page 270
1.
Installing a T1600 Four-Input 240-A Power Supply on page 272
2.

Removing a T1600 Four-Input 240-A DC Power Supply

To remove a four-input 240-A DC power supply:
Switch off the customer site circuit breakers to the power supply being removed. Make
1.
sure that the voltage across the DC power source cable leads is 0 V and that there is
no chance that the cables might become active during the removal process.
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.
Switch the circuit breakers on the power supply faceplate to the off position (
3.
Figure 154: Four-Input 240-A DC Power Supply
LEDs Circuit breakers
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
4.
Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the terminal
5.
studs (see Figure 155 on page 271).
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.
O
and to indicate
(+) (–)
Copyright © 2010, Juniper Networks, Inc.
).