Connecting Dc Power To The Router - Juniper M10i Hardware Manual

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
Power, Connection, and Cable Specifications"
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
To connect DC power to the router, follow this procedure (see
1.
2.
3.
4.
5.
6.
7.
8.
118
Replacing Power System Components
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.
For each power supply, verify that the power switch on the power supply faceplate
is in the ( ) position.
OFF O
Connect the grounding cable to a proper earth ground for both external DC power
sources, if it is not already.
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.
Verify that a licensed electrician has attached a listed power cable lug to each
power source cable.
Loop the power cables through the hook located on the faceplate to the right of
the field-wiring terminals.
Depending on the type of power cable lugs used, loosen or remove the screws
on the field-wiring terminals.
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.
Insert the positive (+) source cable into the return terminal, which is labeled
a.
RTN .
on page 179.
(+) and ( ) to indicate their polarity.
Figure 44
"DC
):