Juniper MX480 - Maintaining the MX480 Fan Tray

Action Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a
negative effect on the ventilation of the chassis. The filter degrades over time. You
must replace the filter every 6 months.
•
CAUTION: Always keep the air filter in place while the device is operating.
Because the fans are very powerful, they could pull small bits of wire or
other materials into the through the unfiltered air intake.This could damage
the components.
• The shelf life of polyurethane filter varies from two years to five years depending on
the storage conditions. Store in a cool, dry, and dark environment. Wrap the media in
plastic and store in an environment with relative humidity between 40%- 80% and
temperature between 40° F (4° C) to 90° F (32° C). Note that if the material flakes,
or becomes brittle when rubbed or deformed, it is no longer usable.
Related
Documentation
Replacing the MX480 Air Filter on page 295•
• Routine Maintenance Procedures for the MX480 Router on page 413
Maintaining the MX480 Fan Tray
Purpose For optimum cooling, verify the condition of the fans.
Action Monitor the status of the fans. A fan tray contains multiple fans that work in unison to
cool the router components. If one fan fails, the host subsystem adjusts the speed of
•
the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails,
and a yellow alarm and red alarm is triggered when a fan tray is removed.
• To display the status of the cooling system, issue the show chassis environment
command. The output is similar to the following:
user@host> show chassis environment
Class Item Status Measurement
Temp PEM 0 OK 40 degrees C / 104 degrees F
PEM 1 Absent
PEM 2 Absent
PEM 3 OK 40 degrees C / 104 degrees F
Routing Engine 0 OK 39 degrees C / 102 degrees F
Routing Engine 1 OK 42 degrees C / 107 degrees F
CB 0 Intake OK 26 degrees C / 78 degrees F
CB 0 Exhaust A OK 27 degrees C / 80 degrees F
CB 0 Exhaust B OK 27 degrees C / 80 degrees F
CB 0 ACBC OK 26 degrees C / 78 degrees F
CB 0 SF A OK 37 degrees C / 98 degrees F
CB 0 SF B OK 35 degrees C / 95 degrees F
CB 1 Intake OK 27 degrees C / 80 degrees F
CB 1 Exhaust A OK 30 degrees C / 86 degrees F
CB 1 Exhaust B OK 28 degrees C / 82 degrees F
CB 1 ACBC OK 27 degrees C / 80 degrees F
Copyright © 2017, Juniper Networks, Inc.416
MX480 3D Universal Edge Router Hardware Guide