Juniper-networks J4350 Manual do Utilizador descarregar pdf (Página 109)

Installing and Connecting a Services Router

c. With a Phillips screwdriver, remove the screws and washers from the PEM

nuts at the gro

unding point on the rear of the chassis.

d. Place the grounding lug at the other e nd of the cable over the grounding

point, as show

ninFigure34.

e. Sec ure the cable lug to the grounding poi nt, first with the washers, then

with the scre

ws.

NOTE: ADCpow

er supply in a Services Router becomes grounded when you

connect a grounding ca ble between the router and earth g round.

3. For each powe

rsupply:

a. Ensure that the volta ge across the DC power source cable leads is 0 V

and that ther

e is no chance that the cable leads might become active

during installation.

CAUTION: Th ere 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 lead

s on the power cables that attach to the terminal studs on each power

supply. You m u st ensure that power connections ma in tain the proper polarity. The

power source cables might be labeled

(+) and (–) to indi cate their polarity.

b. Verify that a licensed electrician has attached the appropriate power cable

lugs to the n eg ative and positive DC source power cables.

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

the ter minal bl ock.

d. With in the terminal block, remove the two center screws next to the

labels

–48 VDC and RTN.

Each screw contains a cap t ive 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

overtighten. A

pply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of

torque to the screw.

f. Using the oth

er removed screw, secure the negative (–) D C source power

cable lug to the

–48 VDC terminal. Tighten the screw until snug. Do not

overtighten. Apply between 8 lb-in. (0.9 Nm) and 9 lb-in. (1.02 Nm) of

torque to the s

crew.

g. Dressthepowercablesappropriately.

Connecting Power 89

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