Powering On The Srx345 Services Gateway; Figure 15: Connecting The Srx345 Services Gateway To A Dc Power Supply - Juniper SRX345 Hardware Manual

Powering On the SRX345 Services Gateway

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Verify that the DC power cables are correctly labeled before making connections to
3.
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 ohm output of the -48V
and RTN DC cables to chassis ground. The cable with very large resistance (indicating
an open circuit) to chassis ground is -48V, and the cable with very low resistance
(indicating a closed circuit) to chassis ground is 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
terminal studs on each power supply.
Remove the screws and square washers from the terminals, using a Phillips (+)
4.
screwdriver, number 2.
Secure each power cable lug to the terminals with the square washers and the screws.
5.
Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw. See
Figure 15 on page 49
Secure the positive (+) DC source power cable lug to the
Secure the negative (–) DC source power cable lug to a

Figure 15: Connecting the SRX345 Services Gateway to a DC Power Supply

Replace the clear plastic cover over the terminal studs on the faceplate.
6.
Verify that the power cables are connected correctly, that they do not touch or block
7.
access to services gateway components, and they do not cause a tripping hazard.
To power on the services gateway:
Insert the power cord plug into the AC power source receptacle.
1.
Chapter 3: Initial Installation and Configuration
and
(+) (–)
(return) terminal.
+
– (input) terminal.
to indicate
49