Maintaining The Mx240 Air Filter; Maintaining The Mx240 Fan Tray - Juniper MX240 Hardware Manual

MX240 3D Universal Edge Router Hardware Guide

Maintaining the MX240 Air Filter

Purpose
Action
Related
Documentation

Maintaining the MX240 Fan Tray

Purpose
Action
378
For optimum cooling, verify the condition of the air filters.
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.
MX240 Cooling System Description on page 17
Troubleshooting the MX240 Cooling System on page 404
Replacing the MX240 Air Filter on page 269
For optimum cooling, verify the condition of the fans.
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
command. The output is similar to the following:
user@host> show chassis environment
Class Item
Temp PEM 0
PEM 1
PEM 2
PEM 3
Routing Engine 0
Routing Engine 1
CB 0 Intake
show chassis environment
Status Measurement
OK 40 degrees C / 104 degrees F
Absent
Absent
OK 40 degrees C / 104 degrees F
OK 39 degrees C / 102 degrees F
OK 42 degrees C / 107 degrees F
OK 26 degrees C / 78 degrees F
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