• Troubleshooting the T640 Power System on page 476
• T640 Preventing Electrostatic Discharge Damage on page 506
Replacing a T640 Three-Phase Wye AC Power Supply Cord
1.
Removing a T640 Three-Phase Wye AC Power Supply Cord on page 416
2.
Installing a T640 Three-Phase Wye AC Power Supply Cord on page 418
Removing a T640 Three-Phase Wye AC Power Supply Cord
To remove a three-phase wye AC power supply cord:
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 223 on page 416) from the power source.
Figure 223: Three-Phase Wye AC Power Supply
Copyright © 2017, Juniper Networks, Inc.416
T640 Core Router Hardware Guide
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