Juniper M10i Hardware Manual page 94

M10i Multiservice Edge Router Hardware Guide
68
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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 DC 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 (see Figure 32 on page 69):
Verify that there is no power flowing from either external power source, so that the
1.
voltage across the leads of the DC 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
2.
in the ( ) position.
OFF O
Verify that a licensed electrician has attached a listed DC power cable lug to each
3.
power source cable.
Loop the DC power cables through the hook located on the faceplate to the right of
4.
the field-wiring terminals.
Depending on the type of DC power cable lugs used, loosen or remove the screws on
5.
the field-wiring terminals.
Insert the DC power cable lugs into the appropriate field-wiring terminals. Using a
6.
number 1 Phillips screwdriver, turn the screw on each field-wiring terminal clockwise
to secure the DC 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.
NOTE: The DC power supplies in slots
by dedicated power feeds derived from feed A, and the DC power supplies
in slots
P/S 2
from feed B. This configuration provides the commonly deployed
redundancy for the system.
Verify that the DC source power cabling and the grounding cabling are correct, that
7.
they are not touching or blocking access to router components, and that they do not
drape where people could trip on them.
and must be powered by dedicated power feeds derived
P/S 3
and must be powered
P/S 0 P/S 1
A/B
Copyright © 2010, Juniper Networks, Inc.
(+)
.
RTN
–48V .
feed