Replacing a T640 Three-Phase Wye AC Power Supply
1.
Removing a T640 Three-Phase Wye AC Power Supply on page 410
2.
Installing a T640 Three-Phase Wye AC Power Supply on page 412
Removing a T640 Three-Phase Wye AC Power Supply
To remove a three-phase wye AC power supply:
1. Switch off the customer site circuit breakers to the power supply being removed. Make
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.
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 power switch on the power supply faceplate to the standby position.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
4. Remove the ESD grounding strap from the ESD point on the chassis, and attach it to
an approved site ESD grounding point. See the instructions for your site.
5. Disconnect the AC power cord (see Figure 218 on page 410) from the power source.
Figure 218: Three-Phase Wye AC Power Supply
6. Remove the ESD grounding strap from the approved site ESD grounding point. See
the instructions for your site. Reconnect the strap to one of the ESD points on the
chassis.
Copyright © 2017, Juniper Networks, Inc.410
T640 Core Router Hardware Guide
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