 |
Caution: Before router installation begins, 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 router. |
To supply power to the router, connect power cables to a separate, dedicated DC power source for each power supply and attach the cables to the terminal studs on the power supply faceplate. Most sites distribute DC power through a main conduit that leads to frame-mounted DC power distribution panels, one of which might be located at the top of the rack that houses the router. A pair of cables (one input and one return) connects each set of terminal studs to the power distribution panel.
The accessory box shipped with the router includes the cable lugs that attach to the terminal studs of the power supply faceplate (see Figure 81). (The cable lug shown in Figure 81 is also used for the grounding the chassis.)
|
Caution: Before router installation begins, 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 router. |
Table 27 summarizes the specifications for the power cables, which you must supply.
Table 27: Power and Grounding Cable Specifications
|
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. You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. |
 |
Warning: For field-wiring connections, use copper conductors only. For other electrical safety information, see Electrical Safety Guidelines and Warnings. |
|
Caution: Power cords and cables must not block access to router components or drape where people could trip on them. |
Figure 83 shows how to attach the power cables. The power cables attach to the 1/4–20 UNC terminal studs located on the power supply faceplate— the input set of studs is labeled –48V and the return set is labeled RTN. The nuts and locking washers used to secure the power cable lugs on the terminal studs are preinstalled on the studs.
The tool for loosening or tightening the nuts on the terminal studs is a 7/16-in. hexagonal-head external drive socket wrench, or nut driver, with a torque range between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm).
|
Caution: Do not substitute a metric nut driver or wrench. A tool that does not fit the nuts exactly can damage them. |
Figure 83: DC Power and Grounding Cable Connections
For a description of the DC power supply, see DC Power Supply. For instructions on connecting the DC power and grounding cables during initial installation, see Connecting Power to a DC-Powered Router. For instructions on replacing a DC power cable, see Disconnecting and Connecting DC Power.
