Figure 19: Connecting Positive (+) DC Power Cables to RTN 2, RTN 5,
RTN 0, RTN 1, RTN 3, and RTN 4
15. Verify that the power cabling is correct, that the power cables are not touching or
blocking access to router components, and that they do not drape where people could
trip on them.
16. Replace the clear plastic cover over the terminal studs on the faceplate.
Connecting Power to a T640 Router with Three-Phase Delta AC Power Supplies
You connect AC power to the router with three-phase delta AC power supplies by
connecting the AC power cord from an AC power supply to an AC power source.
To connect an AC power cord to an AC power source:
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to an approved site ESD grounding point. See the instructions for your site.
2. Switch off the customer site circuit breakers. Ensure that the voltage across the AC
power source is 0 V and that there is no chance that the voltage might become active
during installation.
3. Detach the ESD grounding strap from the approved site ESD grounding point, and
connect the strap to one of the ESD points on the chassis.
4. Switch the power switch on the power supply faceplate to the standby position.
5. Using a number 2 Phillips (+) screwdriver, unscrew the two captive screws located
on the right side of the metal AC wiring compartment.
6. Open the metal door of the metal AC wiring compartment.
7. Unscrew the retaining nut from the AC power cord.
8. Place the retaining nut inside the metal wiring compartment.
9. Put the wires of the AC power cord through the hole of the metal wiring compartment.
10. Screw the retaining nut onto the AC power cord to secure it to the metal wiring
compartment.
Copyright © 2015, Juniper Networks, Inc.34
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