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Connect DC Power Supply Modules
Copyright © 2017, Juniper Networks, Inc.
CAUTION:
The maximum torque rating of the terminal studs on the DC
PDM is 25 lb-in. (33.89 Nm). The terminal studs might be damaged if
excessive torque is applied. Use only a torque-controlled driver or socket
wrench to tighten nuts on the DC PDM terminal studs.
NOTE:
For information about connecting to DC power sources, see the
MX2008 3D Universal Edge Router Hardware Guide.
Connect each DC power cable to the appropriate external DC power source.
9.
NOTE:
For information about connecting to external DC power sources,
see the MX2008 3D Universal Edge Router Hardware Guide.
Switch on the external circuit breakers to provide voltage to the DC power source
10.
cable leads.
NOTE:
Each PDM must be connected to a dedicated
circuit breaker for the DC power source. The PDM has a switch to
accommodate DC circuit breaker amperage.
Verify that the power cabling is correct, that the cables are not touching, and that they
11.
do not block access to router components or drape where people could trip on them.
Close the cable restraint cover over the terminal studs, and tighten the captive screws.
12.
To install an MX2008 DC PSM:
Verify that the power switch on the PSM is in the off (
1.
Figure 41 on page
58).
Move the input mode DIP switch
2.
feed
(expected to be connected), and DIP switch
INP0
position) for the top feed
and
are turned to the
1
be connected, (see
Figure 41 on page
The DC power subsystem is feed redundant. Each DC PSM can be connected to two
separate feeds from different sources that are used to provide feed redundancy. If
two feeds are connected, PSM input power is drawn from the feed with the higher
voltage present. There are two PDMs per power subsystem capable of carrying nine
feeds each. Connect feeds from one source to one PDM and feeds from the other
source to the second PDM of the power subsystem. The primary input of the PSM is
a dual redundant feed, labeled
(left switch) to the
0
INP1
(expected to be connected). If both DIP switches
position, then both top and bottom feeds are expected to
ON
58).
and
. Both feeds are active during operation,
INP0
INP1
Connect DC Power Supply Modules
or
DC
60 A
80 A
) position (see
O
(top position) for the bottom
ON
(right switch) to the
1
ON
(top
0
57
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