Connecting DC Power to the T320 Router

You connect DC power to the T320 router by attaching power cables from the DC power sources to the terminal studs on the power supply faceplates. To connect power to the router, you must provide DC power cables (the cable lugs are supplied with the router). For power cable specifications, see T320 DC Power Cable Specifications.

To connect the DC source power cables to the router for each power supply:

1. 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.

   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.

2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to an approved site ESD grounding point. See the instructions for your site.
3. Verify that the source power cabling is correct, that the cables are not touching or blocking access to router components, and that they do not drape where people could trip on them.
4. Switch the circuit breaker on the power supply faceplate to the off position (O).
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Remove the nuts and washers from the terminal studs.
7. Attach the lugs on the DC source power cables to the terminal studs. Secure the cable lugs to the terminal studs, first with the washers, then with the nuts (see Connect Power Cables to the T320 Power Supply). Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
   1. Attach the positive (+) DC source power cable lugs to the RETURN (return) terminals.
   2. Attach the negative (–) DC source power cable lugs to the –48V (input) terminals.

   Caution: Each power supply must be connected to a dedicated DC power source.

8. Loosen the captive screws on the cable restraint on the right edge of the power supply faceplate.
9. Route the positive and negative DC power cables through the top and bottom of the cable restraint.
10. Tighten the cable restraint captive screw to hold the power cables in place.
11. Verify that the ground and power cabling are correct, that they are not touching or blocking access to router components, and that they do not drape where people could trip on them.
12. Replace the clear plastic cover over the terminal studs on the faceplate.

Figure 1: Connecting DC Power to the T320 Router