Figure 33: Installing A Dc Power Supply On An Srx550 High Memory Services - Juniper SRX550 Hardware Manual

SRX550 High Memory Services Gateway Hardware Guide
168
Figure 33: Installing a DC Power Supply on an SRX550 High Memory
Services Gateway
Using both hands, slide the power supply straight into the chassis until the power
4.
supply is fully seated in the chassis slot. The power supply faceplate should be flush
with any adjacent power supply faceplate.
Tighten the captive screws on the lower edge of the power supply faceplate.
5.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Verify that the DC power cables are correctly labeled before making connections to
7.
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 and DC cables to chassis ground:
–48V RTN
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
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.
Connect DC power cables to the
8.
Remove the screws and square washers from the
a.
(+) screwdriver, number 2. The square washers are permanently attached to the
screws.
and terminals, as shown in
A+ A-
and
A+
Copyright © 2016, Juniper Networks, Inc.
and to indicate
(+) (–)
Figure 22 on page 102:
terminals. Use a Phillips
A-