Installing A T640 Four-Input 240-A Dc Power Supply; Figure 139: Removing A Four-Input 240-A Dc Power Supply; Figure 140: Rear Of The Power Supply Showing Midplane Connectors - Juniper T640 Hardware Manual

Copyright © 2010, Juniper Networks, Inc.

Figure 139: Removing a Four-Input 240-A DC Power Supply

WARNING: Do not touch the power connectors on the rear of the power
supply (see Figure 140 on page 257). They can contain dangerous voltages.

Figure 140: Rear of the Power Supply Showing Midplane Connectors

Installing a T640 Four-Input 240-A DC Power Supply

Each four-input 240-A DC power supply weighs approximately 26.6 lb (12.0 kg). To install
a four-input 240-A DC power supply:
Make sure that the voltage across the DC power source cable leads is 0 V and that
1.
there is no chance that the cables 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.
Switch the circuit breakers on the power supply faceplate to the
3.
Chapter 17: Replacing T640 Router Hardware Components
position ( ).
OFF O
257