Connecting the SRX3600 Services Gateway to a DC Power Source
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.
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, and tape
the switch handle of the circuit breaker in the off position.
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 “Grounding the SRX3600 Services Gateway” on page 139
for instructions.
CAUTION: Before services gateway installation begins, a licensed electrician must attach
appropriate cable lugs to the grounding and power cables that you supply. A cable with
an incorrectly attached lug can damage the services gateway.
CAUTION: Do not mix AC and DC power supplies within the same services gateway.
Damage to the services gateway might occur.
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 protecting 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 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.
148
To Next Page
Loading...
Need help?
General
