Juniper EX4500 Hardware Manual page 60

EX4500 Switch Hardware Guide
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38
The color of the label visible through the vents of the installed fan tray must match the
color of the ejector lever on the installed power supply. The color match indicates that
the power supply has the correct airflow for this model. See
Switches" on page 39.
CAUTION: To prevent overheating of the chassis, verify that the color of the
label visible through the vents of the installed fan tray matches the color of
the ejector lever of the installed power supply. A color match indicates that
the direction of airflow through the fan tray matches the direction of airflow
of the power supply.
Temperature sensors in the chassis monitor the temperature within the chassis. The fan
tray used in the switch comes with load-sharing redundancy that can tolerate a single
fan failure at room temperature (below 113° F/45° C) to still provide sufficient cooling.
Under normal operating conditions, the fans in the fan tray run at less than full speed. If
a fan fails or the ambient temperature rises above the threshold 113° F (45° C), the speed
of the remaining fans is automatically adjusted to keep the temperature within the
acceptable range, 32° F (0° C) through 113° F (45° C).
The system raises an alarm if the fan fails or if the ambient temperature inside the chassis
rises above the acceptable range. If the temperature inside the chassis rises above the
threshold temperature, the system shuts down automatically.
You can check the status of fans and the chassis temperature from the Environment
Status option in the Status menu on the LCD panel. See
on page 20.
You cannot replace a single fan. If one or more fans fail, you must replace the entire fan
tray.
Installing a Fan Tray in an EX4500 Switch on page 175
Removing a Fan Tray from an EX4500 Switch on page 176
Field-Replaceable Units in EX4500 Switches on page 16
Rear Panel of an EX4500 Switch on page 18
Prevention of Electrostatic Discharge Damage on page 281
"AC Power Supply in EX4500
"LCD Panel in EX4500 Switches"
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