Replacing T640 Dc Power Supplies With Ac Power Supplies; Removing The T640 Dc Power Supplies - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
Related
Documentation

Replacing T640 DC Power Supplies with AC Power Supplies

346
T640 Six-Input DC Power Supply Description on page 69
T640 Six-Input DC Power Supply LEDs on page 70
Maintaining the T640 Power Supplies on page 194
T640 Preventing Electrostatic Discharge Damage on page 386
General Safety Guidelines for Juniper Networks Devices on page 383
Replace the DC power supplies with either three-phase delta or wye AC power supplies
Removing the T640 DC Power Supplies on page 346
1.
Installing the T640 Three-Phase Delta AC Power Supplies on page 350
2.
Installing the T640 Three-Phase Wye AC Power Supplies on page 352
3.

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 customer site circuit breakers to the power supply being removed. Make
2.
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.
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.
Using a 7/16-in. (11 mm) nut driver or wrench, remove the nuts and washers from the
5.
terminal studs.
Remove the cable lugs from the terminal studs.
6.
Loosen the captive screw or screws on the cable restraint or restraints on the right
7.
edge of the power supply faceplate.
Carefully move the DC power cables out of the way.
8.
Loosen the captive screws on the lower corners of the power supply faceplate
9.
completely.
Twist the ejector handles on the upper corners of the faceplate counterclockwise to
10.
unseat the power supply.
Grasp the handle on the power supply faceplate and pull firmly. Slide it halfway out
11.
of the chassis.
CAUTION: Each DC power supply weighs approximately 25 lb (11.3 kg).
Be prepared to support the full weight of the power supply as you remove
it from the router.
Copyright © 2013, Juniper Networks, Inc.