Maintaining The Mx240 Fan Tray; Figure 81: Installing The Air Filter - Juniper MX240 Hardware Manual

See Also
See Also

Maintaining the MX240 Fan Tray

Purpose
Action
Copyright © 2019, Juniper Networks, Inc.
Align the captive screws of the air filter cover with the mounting holes on the chassis.
4.
Tighten the captive screws on the air filter cover.
5.

Figure 81: Installing the Air Filter

Preventing Electrostatic Discharge Damage to an MX240 Router on page 380
MX240 Cooling System Description on page 39
Preventing Electrostatic Discharge Damage to an MX240 Router on page 380
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
Chapter 4: Maintaining, Installing and Replacing Components
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
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