Connecting DC Power to an XRE200 External Routing Engine

After you have installed a DC power supply in an XRE200 External Routing Engine, you connect the external Routing Engine to DC power.

Warning: Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.

Caution: Before you connect power to the switch, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the switch (for example, by causing a short circuit).

Caution: Mixing different types of power supplies in the same external Routing Engine is not a supported configuration.

Note: Each power supply input feed must be connected to a dedicated DC power source outlet.

Before you begin connecting DC power to an XRE200 External Routing Engine:

• Install the power supply in the chassis. See Installing an AC or DC Power Supply in an XRE200 External Routing Engine.

Ensure that you have the following parts and tools available:

• The DC power source input.
• Electrostatic discharge (ESD) grounding strap
• DC power source cables (not provided) with the cable lugs (provided) attached.
• 3/8 in. (9.5 mm) nut driver or socket wrench
• Phillips (+) screwdriver, number 1

To connect DC power to an external Routing Engine:

1. Verify that there is no power flowing from either external power source, so that the voltage across the leads of the DC power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
2. Remove the clear plastic shield covering the field-wiring terminals on the power supply.
3. Remove the screws on the field-wiring and ground terminal.
4. Verify that a licensed electrician has attached a listed DC power cable lug to each power source cable and ground cable.

   Note: You must bend the cable lug that attaches to the DC power source cable at a 90° angle in order to properly install the clear plastic shield covering.

5. Insert the DC power and ground cable lugs into the appropriate terminals. Using a number 1 Phillips screwdriver, turn the screw on each terminal clockwise to secure the cable.
   • Insert the positive (+) source cable into the return terminal, which is labeled RTN.
   • Insert the negative (–) source cable into the input terminal, which is labeled –48V.
   • Align the ground cable with the ground terminal.

   Caution: Ensure that each cable lug seats flush against the surface of the terminal block as you tighten the screws.

   Figure 1: Connecting DC Power to an External Routing Engine

   
6. Verify that the DC source power and grounding cables are correct, that they are not touching or blocking access to controller components, and that they do not drape where people could trip on them.
7. Replace the clear plastic shield over the field-wiring terminals.
8. If you are installing a second power supply, repeat Steps 2–7 for that power supply.
9. Switch on the DC power source circuit breaker. Follow your site's procedures for safety and ESD.
10. Verify that the Power LED on each power supply is lit and is on steadily.