Juniper Networks J4350, J6350 manual VDC and RTN

Chapter 6: Installing and Connecting a Services Router

1.Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis. For more information about ESD, see “Preventing Electrostatic Discharge Damage” on page 251.

2.Use a grounding cable to connect the router to earth ground: (For cable requirements, see “Chassis Grounding” on page 123.)

a.Verify that a licensed electrician has attached an appropriate grounding cable lug to the grounding cable.

b.Connect one end of the grounding cable to a proper earth ground, such as the rack in which the router is installed.

c.With a Phillips screwdriver, remove the screw and washer from the PEM nut at the grounding point on the rear of the chassis.

d.Place the grounding lug at the other end of the cable over the grounding point, as shown in Figure 65 on page 128 and Figure 66 on page 129.

e.Secure the cable lug to the grounding point, first with the washer, then with the screw. On J2320 and J2350 routers, use the screw containing a captive washer to secure the cable lug to the grounding point.

NOTE: A DC power supply in a Services Router becomes grounded when you connect a grounding cable between the router and earth ground.

3.For each power supply:

a.Ensure that the voltage across the DC power source cable leads is 0 V and that the cable leads cannot become active in any way during installation.

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.

b.Verify that a licensed electrician has attached the appropriate power cable lugs to the negative and positive DC source power cables.

c.Use a Phillips screwdriver to remove the clear plastic cover protecting the terminal block.

d.Within the terminal block, remove the two center screws next to the labels

–48 VDC and RTN.

Each screw contains a captive washer to secure a DC source power cable lug to the terminal block.

e.Using one of the removed screws, secure the positive (+) DC source power cable lug to the RTN terminal. Tighten the screw until snug. Do not

Connecting Power ■ 127