Connect Dc Power Supply Modules - Juniper MX2020 Quick Start Manual

MX2020 3D Universal Edge Router Quick Start

Connect DC Power Supply Modules

60
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.
Verify that the power switches on the PSM is in the off (
1.
Figure 41 on page 60).
On the PSM, slide the plastic cover away from the input mode switch to expose the
2.
dual DIP switches. Move the input mode DIP switch
for the bottom feed
INP0
to the ON position for the top feed
switches and are turned to the
0 1
expected to be connected (see
In addition, a PSM failure triggers the alarm LED on the craft interface.
NOTE: The DIP switches are used only to indicate presence of a feed. If
both feeds are present, power is always drawn from feed
0 fails will power be drawn from feed
Figure 41: Selecting DC Power Subsystem Feed Redundancy
PWR OK FAULT
INP0 INP1
(expected to be connected), and DIP switch
INP1 (expected to be connected). If both DIP
position, then both top and bottom feeds are
ON
Figure 41 on page 60).
1 .
ON
0 1
or DC
60 A 80 A
) position (see
O
(left switch) to the position
0 ON
(right switch)
1
. Only if feed
0
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