Connect Power to a DC-Powered Router

Connect power to a DC-powered router by attaching power cables from external DC power sources to the terminal studs on each power supply. Power and grounding cables are not supplied with the router. For information about the required cable type, see DC Power and Grounding Cable Specifications. 

The router must be connected to two separate external DC power sources, one for each power supply.

 

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 circuit breaker box. You must ensure that the connections at the circuit breaker box maintain the proper polarity. The power source DC cables might be labeled (+) and (-) to indicate their polarity.

To connect DC power cables to the power supplies, follow this procedure:

1. Ensure that the voltage across the leads of the DC power cables that you are connecting to the circuit breaker box is 0 V and that there is no chance that the cable leads might become active during installation.
2. Verify that a licensed electrician has attached the cable lugs provided with the router to the grounding and power cables.
3. Verify that the power switch is in the OFF (0) position (see Figure 51).

Figure 51: DC Power Switch in the Off Position

4. Attach the grounding cable to a proper earth ground for both external DC power sources, if it is not already.
5. Remove the nuts and locking washers that are preinstalled on the grounding studs at the lower right corner of the power supply faceplate. Slide the grounding cable lug onto the studs and replace the washers and nuts. Using a 7/16-in. nut driver or wrench, tighten the nuts.     
   
   

   Do not substitute a metric nut driver or wrench. A tool that does not fit the nuts exactly can damage them. If a 7/16-in. tool is not available, use pliers or an adjustable wrench.

   
   
6. Using a Phillips screwdriver, loosen the screws securing the protective shield over the power terminal studs. Remove the shield. Remove the outer nut and washer that are preinstalled on each terminal stud.
7. Slide the power cable lugs onto the terminal studs on the power supply faceplate (see Figure 52):

• Connect the positive (+) source cable lug to the return terminal, which is labeled RTN.
• Connect the negative (-) source cable lug to the input terminal, which is labeled -48V.

Run the power cables to the left on the left power supply, and to the right on the right power supply. This arrangement enables you to replace a power supply without having to detach the cables from the other power supply.

Figure 52: Attach Cables to the DC Power Supply

8. Secure the power cable lugs to the terminal studs, first with a washer, then with a nut (the washers and nuts are provided with the router). Using a 7/16-in. nut driver or wrench, tighten the nuts.     
   
   

   Do not substitute a metric nut driver or wrench. A tool that does not fit the nuts exactly can damage them. If a 7/16-in. tool is not available, use pliers or an adjustable wrench.

   
   
9. Verify that the 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.
10. Replace the clear cover over the terminal studs and tighten the screws that secure it to the power supply.
11. Repeat Steps 3 through 10 to reinstall the second power supply.