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Connecting Power to a Two-Input 160-A Power Supply in a TX Matrix Router


You connect DC power to the TX Matrix 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 power cables (the cable lugs are supplied with the router). For power cable specifications, see TX Matrix DC Power Cable and Lug Specifications.

To connect the DC source power cables to a two-input 160-A power supply:

  1. Switch off the customer site circuit breakers. Follow your site’s instructions. 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. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  3. Switch the circuit breakers on the power supply faceplate to the off position (O).
  4. Remove the clear plastic cover protecting the terminal studs on the faceplate.
  5. Remove the nuts and washers from the terminal studs.
  6. Attach the lugs on the DC source power cables to the terminal studs, making sure the cables are not touching or in the way of any TX Matrix router components:
    1. Attach the positive (+) DC source power cable lugs to the RTN (return) terminals.
    2. Attach the negative (–) DC source power cable lugs to the –48V (input) terminals.

    Secure the cable lugs to the terminal studs, first with the washers, then with the nuts. Use a 7/16-in. (11 mm) nut driver or socket wrench to tighten the nuts. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.


    Each power supply must be connected to one dedicated DC power source for each set of return and input terminals.


    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.

  7. Loosen the captive screws on the cable restraints on the right edge of the power supply faceplate.
  8. Route the positive and negative DC power cables through the top and bottom of each cable restraint.
  9. Tighten the cable restraint captive screws to hold the power cables in place.
  10. Verify that the power cabling is correct, that the cables are not touching or blocking access to TX Matrix router components, and that they do not drape where people could trip on them.
  11. Replace the clear plastic cover over the terminal studs on the faceplate.
Figure 1: Connecting DC Power to the Two-Input 160-A DC Power Supplies
Connecting DC Power
to the Two-Input 160-A DC Power Supplies