5. Switch the circuit breakers on the power supply faceplate to the off position (O).
6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
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.
7. Remove the nut and washer from the terminal stud. Use a 7/16-in. (11 mm) nut driver.
8. Remove the cable lug from the terminal studs.
9. Loosen the captive screw or screws on the cable restraint on the right edge of the
power supply faceplate.
10. Carefully move the power cable out of the way.
Figure 189 on page 374, Figure 190 on page 375, and Figure 191 on page 376 show how to
remove the nut and washer from the terminal stud.
Figure 189: Disconnecting a DC Power Cable from a Two-Input 160-A DC
Power Supply
Copyright © 2017, Juniper Networks, Inc.374
T640 Core Router Hardware Guide
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