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 each power supply.
4. Remove the screws and square washers from the terminals. Use a number-2 Phillips screwdriver.
5. Secure each power cable lug to the terminals, first with the square washer, then with the screw. Apply
between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each screw.
•
Secure each positive (+) DC source power cable lug to a RTN (return) terminal.
•
Secure each negative (–) DC source power cable lug to a -48V (input) terminal.
6. Replace the clear plastic cover over the terminal studs on the faceplate.
7. Verify that the power cables are connected correctly, that they are not touching or blocking access to
services gateway components, and that they do not drape where people could trip on them.
8. If you are installing multiple power supplies, repeat steps 1 through 7 for the other power supplies.
Figure 61: Connecting to DC Power
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