• Powering Off the SRX1500 Services Gateway on page 69
• Replacing an AC Power Supply on the SRX1500 Services Gateway on page 101
Connecting the SRX1500 Services Gateway to a DC Power Supply
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.
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 “Connecting the
SRX1500 Services Gateway Grounding Cable” on page 58 for instructions.
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 (0), and tape the switch handle of the circuit
breaker in the OFF position.
CAUTION: Do not mix AC and DC power supplies within the same services
gateway. Damage to the services gateway might occur.
CAUTION: Before you connect power to the services gateway, a licensed
electrician must attach appropriate cable lugs to the grounding and power
cables that you use. A cable with an incorrectly attached lug can damage
the device (for example, by causing a short circuit).
To connect the DC source power cables to the services gateway for each power supply:
1. Switch off the dedicated facility circuit breakers. Ensure that the voltage across the
DC power source cable leads is 0 V and that there is no chance that the cable leads
might become active during installation.
2. Remove the clear plastic cover that protects the terminal studs on the faceplate.
3. Verify that the DC power cables are correctly labeled before making connections to
the power supply.
In a typical powerdistribution 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
67Copyright © 2017, Juniper Networks, Inc.
Chapter 16: Providing Power to the SRX1500 Services Gateway
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