Juniper SRX5400 Hardware Manual page 82

SRX5400 Services Gateway Hardware Guide
68
WARNING: To meet safety and electromagnetic interference (EMI)
requirements and to ensure proper operation, you must properly ground the
services gateway chassis before connecting power. See
SRX5400 Services Gateway" on page 64
CAUTION: Do not mix AC and DC power supplies within the same services
gateway. Damage to the services gateway might occur.
You connect DC power to the services gateway by attaching power cables from the
external DC power sources to the terminal studs on the power supply faceplates. You
must provide the power cables (the cable lugs are supplied with the device).
To connect the DC source power cables to the services gateway:
Switch off the dedicated customer site circuit breakers. Ensure that the voltage across
1.
the DC power source cable leads is 0 V and that there is no chance that the cable
leads might become active during installation.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Move the DC circuit breaker on the power supply faceplate to the off (
3.
Check the setting of the input mode switch. Use a sharp, nonconductive object to
4.
slide the switch to the desired position. Set the input mode switch to position 0 for
60-A input and position 1 for 70-A input. This setting is used by the power management
software and must be set on the power supply. See
Figure 30: DC Power Supply Input Mode Switch
Remove the clear plastic cover protecting the terminal studs on the faceplate.
5.
Verify that the DC power cables are correctly labeled before making connections to
6.
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
is –48V .
"Grounding the
for instructions.
O ) position.
Figure 30 on page 68.
Copyright © 2014, Juniper Networks, Inc.