Connecting Power To A Dc-Powered Router - Juniper M7i Hardware Manual

M7i Multiservice Edge Router Hardware Guide

Connecting Power to a DC-Powered Router

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Connect DC power to the router by inserting power cables into the field-wiring terminals
on the faceplate of each power supply. Power cables are not supplied with the router.
For information about the required cable type, see .
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 each power supply. 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 (see
Verify that there is no power flowing from either external power source, so that the
1.
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.
Verify that a licensed electrician has attached a listed power cable lug to each power
2.
source cable.
Loop the power cables through the hook located on the faceplate to the right of the
3.
field-wiring terminals.
Depending on the type of power cable lugs used, loosen or remove the screws on the
4.
field-wiring terminals.
Insert the power cable lugs into the appropriate field-wiring terminals. Using a number
5.
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.
Insert the negative (–) source cable into the input terminal, which is labeled
b.
Verify that the DC source power cabling and the grounding cabling are correct, that
6.
they are not touching or blocking access to router components, and that they do not
drape where people could trip on them.
Figure 38 on page 125):
Copyright © 2019, Juniper Networks, Inc.
(+)
RTN .
–48V .