Removing A T640 Six-Input Dc Power Supply; Figure 193: Dc Power Supply; Figure 194: Disconnecting Power Cables From The Dc Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
330

Removing a T640 Six-Input DC Power Supply

To remove a six-input DC power supply:
Switch off the customer site circuit breakers to the power supply being removed. Make
1.
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.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
2.

Figure 193: DC Power Supply

Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the terminal
3.
studs (see Figure 194 on page
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
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.

Figure 194: Disconnecting Power Cables from the DC Power Supply

Cable lug
Locking
washer
Nut
Remove the cable lugs from the terminal studs.
4.
330).
Terminal studs
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