Connecting DC Power Cables to the ACX1000 or ACX1100 Router
To connect DC power to the router, you need the following tools:
•
Phillips (+) screwdriver, number 2
•
ESD grounding wrist strap
•
M3 screws and flat washers
•
DC power source cables, minimum 14 AWG or as required by local code (not provided)
•
Ring lugs, Molex 190700067 or equivalent (not provided)
The DC power supply has four terminals on the front panel, covered by a clear plastic
cover.
WARNING: You must ground the router before connecting the DC power
cables.
To connect the power cables:
1. Switch off the dedicated customer site 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 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 the resistance
of the DC cables to chassis ground:
For –48V and –60V:
a. The cable with very large resistance (indicating an open circuit) to chassis ground
is the DC input cable (–).
b. The cable with very low resistance (indicating a closed circuit) to chassis ground
is the return cable (+).
For +24V:
a. The cable with very low resistance (indicating a closed circuit) to chassis ground
is the DC input cable (–).
b. The cable with very large resistance (indicating an open circuit) to chassis ground
is the return cable (+).
4. Remove the screws and flat washers from the terminals.
105Copyright © 2017, Juniper Networks, Inc.
Chapter 12: Connecting the Router to Power
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