Replacing T640 Dc Power Supplies With Ac Power Supplies; Removing The T640 Dc Power Supplies; Figure 148: Connecting A Dc Power Cable To A Four-Input 240-A Dc Power; Supply - Juniper T640 Hardware Manual

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Replacing T640 DC Power Supplies with AC Power Supplies

Copyright © 2010, Juniper Networks, Inc.

Figure 148: Connecting a DC Power Cable to a Four-Input 240-A DC Power

Supply

Cable lug
Locking
washer
Nut
T640 Power System Description on page 49
Maintaining the T640 Power Supplies on page 159
T640 DC Power Supply Electrical Specifications on page 348
Site Electrical Wiring Guidelines for M Series and T Series Routers on page 346
Removing the T640 DC Power Supplies on page 267
1.
Installing the T640 Three-Phase Delta or Wye AC Power Supplies on page 271
2.

Removing the T640 DC Power Supplies

You must remove both DC power supplies before you install the AC power supplies.
Power off the router.
1.
Switch off the external circuit breakers to the power supply being removed. Make sure
2.
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
3.
the strap to one of the ESD points on the chassis.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
4.
Chapter 17: Replacing T640 Router Hardware Components
Terminal studs
267