Maintaining The M320 Fan Trays - Juniper M320 Hardware Manual

M320 Multiservice Edge Router Hardware Guide
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Maintaining the M320 Fan Trays

Purpose
Action
268
every six months. For procedures to replace the air filters, see
Filter" on page 203.
Spare filter elements should be used within 1 year of manufacture. Check the date of
manufacture printed on the filter. Store spare filter elements in a dark, cool, and dry
place. Storing the filter elements at higher temperatures, or where they can be exposed
to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents, can
significantly reduce their life.
CAUTION: Always keep both air filters 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.
M320 Cooling System Description on page 21
Troubleshooting the M320 Cooling System on page 287
Replacing an M320 Air Filter on page 203
Replacing an M320 Fan Tray on page 208
For optimum cooling, verify the condition of the fans.
On a regular basis:
Monitor the status of the fans. The fan trays each contain 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 is triggered when a fan tray is removed.
To display the status of the fans, issue the
output is similar to the following:
user@host> show chassis environment
Class Item
...
Fans Top Left Front fan
Top Left Middle fan
Top Left Rear fan
Top Right Front fan
Top Right Middle fan
Top Right Rear fan
Bottom Left Front fan
Bottom Left Middle fan
Bottom Left Rear fan
Bottom Right Front fan
Bottom Right Middle fan OK
Bottom Right Rear fan
Fourth Blower from top
show chassis environment
Status Measurement
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
Spinning at normal speed
OK Spinning at normal speed
OK Spinning at normal speed
Copyright © 2015, Juniper Networks, Inc.
"Replacing an M320 Air
command. The