13. Replace the clear plastic cover on the power supply.
14. Repeat the procedure for the remaining power supply.
Figure 14: Connecting Power to the Three-Input 240-A DC Power Supply
Connecting Power to a T640 Router with Four-Input 160-A DC Power Supplies
To connect DC power cables to the router:
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. Make sure that the voltage across the
DC power source cable leads is 0 V and that there is no chance that the cable leads
might become active during installation. Follow your site's instructions for safety.
3. Verify that a licensed electrician has attached the cable lugs provided with the router
to the DC power cables.
4. Verify that the router is properly grounded.
5. 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.
6. Verify that the circuit breakers on the power supply faceplate are in the OFF (O)
position.
Copyright © 2015, Juniper Networks, Inc.28
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