Replacing A T640 Three-Phase Wye Ac Power Supply Cord; Removing A T640 Three-Phase Wye Ac Power Supply Cord; Figure 229: Three-Phase Wye Ac Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

Replacing a T640 Three-Phase Wye AC Power Supply Cord

370
1. Removing a T640 Three-Phase Wye AC Power Supply Cord on page 370
Installing a T640 Three-Phase Wye AC Power Supply Cord on page 371
2.

Removing a T640 Three-Phase Wye AC Power Supply Cord

To remove a three-phase wye AC power supply cord:
Switch off the customer site circuit breakers to the power supply being removed. Make
1.
sure that the voltage across the AC power source cord is 0 V and that there is no
chance that the power cord might become active during the removal process.
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 power switch on the power supply faceplate to the standby position.
3.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
Remove the ESD grounding strap from the ESD point on the chassis, and attach it to
4.
an approved site ESD grounding point. See the instructions for your site.
Disconnect the AC power cord (see
5.

Figure 229: Three-Phase Wye AC Power Supply

Remove the ESD grounding strap from the approved site ESD grounding point. See
6.
the instructions for your site. Reconnect the strap to one of the ESD points on the
chassis.
Using a number 2 Phillips (+) screwdriver, unscrew the two screws on the metal cover
7.
protecting the AC terminal block.
Figure 229 on page 370) from the power source.
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