Figure 119: Disconnecting Power Cables From A Two-Input 160-A Dc Power - Juniper TX MATRIX Hardware Manual

TX Matrix Hardware Guide
270
To remove a two-input 160-A DC power supply:
Make sure that the voltage across the DC power source cable leads is 0 V and that
1.
there is no chance that the cables might become active during the removal process.
For a nonredundant power supply, power off the system. For redundant power supplies,
2.
verify that the other power supply is functional.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Switch the circuit breakers on the power supply faceplate to the off position (
4.
NOTE: After powering off a power supply, you must wait at least 60
seconds before turning it back on.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the terminal
6.
studs (see Figure 119 on page 270).

Figure 119: Disconnecting Power Cables from a Two-Input 160-A DC Power

Supply
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.
O
and to indicate
(+) (–)
Copyright © 2010, Juniper Networks, Inc.
).