Juniper Networks M10i manual Connecting DC Power to the Router

M10i Internet Router Hardware Guide

Connecting DC Power to the Router

Connect DC power to the router by inserting power cables into the field-wiring terminals on the faceplate of each power supply. Power and grounding cables are not supplied with the router. For information about the required cable type, see “DC Power, Connection, and Cable Specifications” on page 179.

NOTE: The router must be connected to at least two separate external DC power sources.

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.

To connect DC power to the router, follow this procedure (see Figure 44):

1.Verify 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 both external DC power sources, if it is not already.

4.Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable, and that the cable is attached to a grounding point on the chassis rear.

5.Verify that a licensed electrician has attached a listed power cable lug to each power source cable.

6.Loop the power cables through the hook located on the faceplate to the right of the field-wiring terminals.

7.Depending on the type of power cable lugs used, loosen or remove the screws on the field-wiring terminals.

8.Insert the power cable lugs into the appropriate field-wiring terminals. Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal clockwise to secure the power cable lug. Apply between 8 lb-in. (.9 Nm) and 9 lb-in. (1.02 Nm) of torque to each screw.

a.Insert the positive (+) source cable into the return terminal, which is labeled

RTN.

118■ Replacing Power System Components