T640 Router; Supply; Figure 185: Optional Cable Restraint On A Three-Input 240-A Dc Power - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
320

Figure 185: Optional Cable Restraint on a Three-Input 240-A DC Power

Supply

Connecting DC Power to a Three-Input 240-A DC Power Supply in a T640 Router
To connect a three-input 240-A DC power supply to the power sources:
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to one of the ESD points on the chassis.
Verify that a licensed electrician has attached cable lugs to the power cables that you
2.
supply.
Verify that the voltage across the DC power source cables leads is 0 V and that there
3.
is no chance that the cables might become active during installation. If needed, switch
off the customer site circuit breakers.
Verify that the circuit breakers on the power supply faceplate are in the
4.
position ( ).
O
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Remove the nut and washer from each power terminal stud.
6.
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.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see
7.
Figure 186 on page 322).
Attach the positive (+) DC source power cable lugs to the
a.
terminals.
OFF
(+) and (–) to indicate
(return)
RETURN
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