5. Tighten the captive screws on the lower edge of the power supply faceplate.
6. Remove the clear plastic cover protecting the terminal studs on the faceplate.
7. Verify that the DC power cables are correctly labeled before making connections to
the power supply. In a typical power distribution scheme where the return is connected
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the –48V and RTN DC cables to chassis ground:
•
The cable with very large resistance (indicating an open circuit) to chassis ground
will be –48V.
•
The cable with very low resistance (indicating a closed circuit) to chassis ground
will be RTN.
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
terminals on the power supply.
8. Connect DC power cables to the A+ and A- terminals, as shown in Figure 22 on page 102:
a. Remove the screws and square washersfrom the A+ and A- terminals. Use a Phillips
(+) screwdriver, number 2. The square washers are permanently attached to the
screws.
b. Secure each power cable lug to the appropriate terminal with a screw. Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw.
•
Secure the positive (+) DC source power cable lug to the A+ (return) terminal.
•
Secure the negative (–) DC source power cable lug to the A- (input) terminal.
101Copyright © 2016, Juniper Networks, Inc.
Chapter 14: Installing the SRX550 High Memory Services Gateway
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