Figure 141: Mx240 Dc High-Capacity Power Supply Input Mode Switch - Juniper MX240 Hardware Manual

Copyright © 2019, Juniper Networks, Inc.
NOTE: If output power is not load-balancing correctly in the same zone on
an MX router with a high-capacity AC or DC power supply module, connect
two feeds and change the DIP switch to
supply module.
Each High Capacity AC or DC power supply accepts two AC or DC feeds in two unique
AC or DC receptacles. It is possible to operate with one feed, but there is a reduction in
the power supply output. The DIP switch must be set according to the number of AC or
DC feeds that are present for the power supply. Refer to

Figure 141: MX240 DC High-Capacity Power Supply Input Mode Switch

Position – 0 indicates that only one AC or DC feed is provided.
Position – indicates that two AC or DC feeds are provided.
1
To check the DIP switch position:
Issue the show chassis power
1.
connected. The following example shows there are two AC input feeds connected
for PEM 0 and one AC input feed connected for PEM 1. This indicates that the DIP
switch for PEM 0 is in position 1 and the DIP switch for PEM 1 is in position 0. These
are the proper settings.
# run show chassis power
PEM 0:
State: Online
AC input: OK (2 feed expected, 2 feed connected)
Capacity: 4100 W (maximum 4100 W)
DC output: 855 W (zone 0, 15 A at 57 V, 20% of capacity)
PEM 1:
State: Online
AC input: OK (1 feed expected, 1 feed connected)
Capacity: 1700 W (maximum 4100 W)
DC output: 969 W (zone 1, 17 A at 57 V, 57% of capacity)
Issue the
show chassis alarms
2.
DIP switch:
Chapter 5: Troubleshooting Hardware
to boost the voltage on the power
1
Figure 141 on page 359
command and check to see how many feeds are
command to see if there are any active alarms on the
359