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:
1. Make 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 installation.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
3. Switch the circuit breakers on the power supply faceplate to the OFF position (O).
4. Using both hands, slide the power supply into the chassis until you feel resistance
(see Figure 179 on page 361).
5. Twist the ejector handles at the upper corners of the power supply faceplate clockwise
until they stop.
6. Tighten the captive screws at the lower corners of the power supply faceplate to
secure the power supply in the chassis.
Figure 179: Installing a Three-Input 240-A DC Power Supply
Replacing the T640 Cable Restraint on a Three-Input 240-A DC Power Supply
Each three-input 240-A DC power supply is shipped with the standard cable restraint,
as shown in “Standard Cable Restraint on a Three-Input 240-A Power Supply” on page 362.
Two optional cable restraints are shipped in the accessory box.
If your DC power cables are too large or inflexible to fit into the standard cable restraint,
we recommend that you remove the standard cable restraint and install the optional
361Copyright © 2017, Juniper Networks, Inc.
Chapter 29: Replacing Power System Components
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