Connecting Power to a DC-Powered M120 Router

You connect DC power to the 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 (cable lugs are supplied with the router). For power cable specifications, see M120 DC Power, Connection, and Cable Specifications.

To connect the DC source power cables to the router:

1. 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. Secure the power cable lugs to the terminal studs, first with the flat washer, then with the nut (see Figure 1). Apply between 12 lb-in. (1.4 Nm) and 15 lb-in. (1.7 Nm) of torque to each nut.
   1. Attach the positive (+) DC source power cable lug to the RETURN (return) terminal.
   2. Attach the negative (–) DC source power cable lug to the –48V (input) terminal.
3. Loosen the captive screw on the cable restraint on the lower edge of the power supply faceplate.
4. Connect each DC power cable to the appropriate external DC power source.

   Note: For information about connecting to external DC power sources, see M120 DC Power, Connection, and Cable Specifications.

Figure 1: Connecting DC Power to the M120 Router