Installing A T640 Three-Input 240-A Dc Power Supply; Figure 182: Three-Input 240-A Dc Power Supply - Juniper T640 Hardware Manual

Copyright © 2013, Juniper Networks, Inc.
To set the input mode switch (see
Using a screwdriver, loosen the captive screw holding the metal cover over the input
1.
mode switch (see Figure 182 on page
Rotate the metal cover away from the input mode switch to expose the switch.
2.
Check the setting of the input mode switch. Use a flashlight, if necessary. In
3.
mode, the switch must be located all the way to the right.
If the input mode switch is not set correctly, use a sharp, nonconductive object to slide
4.
the switch all the way to the right to set the power supply to
CAUTION: Do not use a pencil, because fragments can break off and cause
damage to the power supply.
Rotate the metal cover over the input mode switch, and use a screwdriver to tighten
5.
the captive screw.

Figure 182: Three-Input 240-A DC Power Supply

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

Each three-input 240-A DC power supply weighs approximately 25 lb (11.3 kg). To install
a three-input 240-A 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
Figure 182 on page 317) to
317).
mode:
2-INPUT
2-INPUT
2-INPUT .
OFF position ( O ).
317