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the color coding for the leads on the power cables that attach to the

terminal studs on each power supply.

9. Remove the washers and nuts from each DC power input terminal, using a 7/16-in.

[11-mm] nut driver or socket wrench.

10. Secure each power cable lug to the terminal studs, first with the flat washer, then

with the split washer, and then with the nut (see Figure 53 on page 187). Apply between

23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut. Do not overtighten the

nut. (Use a 7/16-in. [11-mm] torque-controlled driver or socket wrench.)

a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.

b. Secure the negative (–) DC source power cable lug to the –48V (input) terminal.

CAUTION: Ensure thateach power cablelugseatsflush against the surface

of the terminal block as you are tightening the nuts. Ensure that each nut

is properly threaded onto the terminal stud. You must be able to spin the

nut freely with your fingers when it is first placed onto the terminal stud.

Applying installation torque to the nut when improperly threaded may

result in damage to the terminal stud.

CAUTION: The maximum torque rating of the terminal studs on the DC

power supply is 36 lb-in. (4.0 Nm). The terminal studs may be damaged

if excessivetorque is applied. Use only a torque-controlled driver or socket

wrench to tighten nuts on the DC power supply terminal studs.

CAUTION: The DC power supplies in PEM0 and PEM1 must be powered

by dedicated power feeds derived from feed A, and the DC power supplies

in PEM2 and PEM3 must be powered by dedicated power feeds derived

from feed B. This configuration provides the commonly deployed A/B feed

redundancy for the system.

For information about connecting to DC power sources, see “DC Power Supply

Specifications for EX9208 Switches” on page 96.

11. Route the power cables along the cable restraint toward the left or right corner of the

chassis. If needed, thread plastic cable ties, which you must provide, through the

openings on the cable restraint to hold the power cables in place.

12. Replace the clear plastic cover over the terminal studs on the faceplate.

13. Verify that the power cabling is correct, that the cables are not touching or blocking

access to switch components, and that they do not drape where people could trip on

them.

EX9208 Switch Hardware Guide

Juniper EX9208 Hardware Guide

Other manuals for Juniper EX9208