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.
To remove a two-input 160-A DC 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 the removal process.
2. For a nonredundant power supply, power off the system. For redundant power supplies,
verify that the other power supply is functional.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
4. Switch the circuit breakers on the power supply faceplate to the off position (O).
NOTE: After powering off a power supply, you must wait at least 60
seconds before turning it back on.
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the terminal
studs (see Figure 170 on page 350).
Figure 170: Disconnecting Power Cables from a Two-Input 160-A DC
Power Supply
Copyright © 2017, Juniper Networks, Inc.350
T640 Core Router Hardware Guide
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