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Connect DC Power

Caution: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity.

Caution: 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 the power supply faceplate.

  1. Make sure that there is no power flowing from either external power source, so that the voltage across the leads of the power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
  2. For each power supply, verify that the power switch on the power supply faceplate is in the OFF (O) position.
  3. Connect the grounding cable to a proper earth ground for each external DC power source, if it is not already connected.
  4. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
  5. Using a number 2 Phillips screwdriver, remove the screws next to the grounding symbol above the power supplies on the chassis rear. Secure the grounding cable lug to the grounding point by reinstalling and tightening the screws.
  6. Verify that a licensed electrician has attached a listed power cable lug to each power source cable.
  7. Loop the power cables through the hook located on the faceplate to the right of the field-wiring terminals.
  8. Depending on the type of power cable lugs used, loosen or remove the screws on the field-wiring terminals.
  9. Insert the power cable lugs into the appropriate field-wiring terminals. Use a number 1 Phillips screwdriver to secure the power cable lug Turn the screw on each field-wiring terminal clockwise, and apply between 8 lb-in. (.9 Nm) and 9 lb-in. (1.02 Nm) of torque to each screw.
    1. Insert the positive (+) cable lugs into the RTN (return) terminal.
    2. Insert the negative (–) cable lugs into the -48V (input) terminal.
  10. Verify that the DC source power cabling and the grounding 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.
  11. Switch on the external circuit breakers to provide voltage to the DC power source cable leads.

Figure 6: Connect Power to a DC Router

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