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
356
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 router is operating.
Because the fans are very powerful, they could pull small bits of wire or
other materials into the router through the unfiltered air intake. This could
damage the router components.
Use spare filters within 1 year of manufacture. Check the date of manufacture printed
on the filter. Store spare air filters in a dark, cool, and dry place. Storing air filters at
higher temperatures, or where they can be exposed to ultraviolet (UV) radiation,
hydrocarbon emissions, or vapors from solvents, can significantly reduce their life.
MX240 Cooling System Description on page 17
Troubleshooting the MX240 Cooling System on page 380
Replacing the MX240 Air Filter on page 259
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
CB 0 Exhaust A
CB 0 Exhaust B
CB 0 ACBC
CB 0 SF A
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
OK 27 degrees C / 80 degrees F
OK 27 degrees C / 80 degrees F
OK 26 degrees C / 78 degrees F
OK 37 degrees C / 98 degrees F
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