Juniper SRX650 Quick Start Manual

Connecting the SRX650 Services Gateway to the DC Power Supply
CAUTION: Do not mix AC and DC power supplies within the same services gateway.
Damage to the device might occur.
The 645 W DC power supply with PoE support is available for the SRX650 Services
Gateway.
WARNING: Before performing the following procedure, ensure that power is removed
from the DC circuit. To ensure that all power is off, locate the circuit breaker on the
panel board that services the DC circuit, switch the circuit breaker to the off position
( O ), and tape the switch handle of the circuit breaker in the off position.
You connect DC power to the device by attaching power cables from the external
DC power sources to the terminal studs on the power supply faceplate. You must
provide the power cables (the cable lugs are supplied with the services gateway).
To connect the DC source power cables to the services gateway power supply:
Switch off the dedicated facility 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
2.
connect the strap to the ESD point on the side of the chassis.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
3.
Verify that the DC power cables are correctly labeled before making connections
4.
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 that 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
will be 48V and 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 terminal studs on the power supply.
Remove the screws and square washers from the terminals. Use a number 2
5.
Phillips screwdriver.
Secure each power cable lug to the terminals, first with the square washer, then
6.
with the screw. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque
to each screw.
Connecting the SRX650 Services Gateway to the DC Power Supply
1