Installing a T640 Four-Input 240-A DC Power Supply
Each four-input 240-A DC power supply weighs approximately 26.6 lb (12.0 kg). To install
a four-input 240-A DC power supply:
1. Make sure that the voltage across the DC power source cable leads is 0 V and that
there is no chance that the cables might become active during installation.
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 circuit breakers on the power supply faceplate to the OFF position (O).
4. Using both hands, slide the power supply into the chassis until you feel resistance
(see Figure 188 on page 372).
5. Twist the ejector handles at the upper corners of the power supply faceplate clockwise
until they stop.
6. Tighten the captive screws at the lower corners of the power supply faceplate to
secure the power supply in the chassis.
7. Verify that a licensed electrician has attached cable lugs to the power cables that you
supply.
8. Remove the clear plastic cover protecting the terminal studs on the faceplate.
9. Remove the nut and washer from each power terminal stud.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled (+) and (–) to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
10. Attach the lugs on the DC source power cables to the terminal studs.
a. Attach the positive (+) DC source power cable lugs to the RETURN (return)
terminals.
b. Attach the negative (–) DC source power cable lugs to the –48V (input) terminals.
Copyright © 2017, Juniper Networks, Inc.370
T640 Core Router Hardware Guide
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