Removing a T640 Six-Input DC Power Supply
To remove a six-input DC power supply:
1. Switch off the customer site circuit breakers to the power supply being removed. 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 the removal process.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on.
2. Remove the clear plastic cover protecting the terminal studs on the faceplate.
Figure 195: DC Power Supply
3. Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the terminal
studs (see Figure 196 on page 382).
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.
381Copyright © 2017, Juniper Networks, Inc.
Chapter 29: Replacing Power System Components
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