Cisco Cisco Packet Data Gateway (PDG) Guida All'Installazione
Replaceable Components
▀ Fan Tray Units
▄ ASR 5500 Installation Guide
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Fan Tray Units
The four fan tray units draw air up through the chassis for cooling and ventilation. The heated air exhausts through the
vents at the rear and sides of the chassis.
vents at the rear and sides of the chassis.
This section describes how to remove and replace the front and rear fan tray units should there be a partial or complete
failure of a unit.
failure of a unit.
Caution:
Do not operate the chassis for more than a very brief period of time (less than one minute) with one or
more fan trays out of service. Doing so may cause the system to overheat and result in component damage.
Important:
Each front fan tray is controlled by its corresponding rear fan tray. Removal or failure of a rear fan
tray will cause the corresponding front fan tray to cease running.
Determining Whether a Fan Tray Unit Needs Replacing
The system has several ways to indicate a fan tray failure. The first indicator is that the System Status LED on the
System Status Card (SSC) illuminates red to indicate the failure of a chassis component.
System Status Card (SSC) illuminates red to indicate the failure of a chassis component.
If you see a red System Status LED on the SSC, you can determine whether it is a fan tray failure by using the CLI.
Refer to
Refer to
Replacing Front Fan Trays
Caution:
Fan tray units contain multiple fans that spin at a high rate of speed when the system is powered on. If
the system is powered on when a fan tray is removed, do not touch moving fans. To minimize the risk of personal injury
and potential equipment damage, pull the fan tray towards you until the fan tray extends out of the chassis
approximately two inches (5 cm). Wait a few seconds to allow fans to spin down before fully removing the fan tray.
and potential equipment damage, pull the fan tray towards you until the fan tray extends out of the chassis
approximately two inches (5 cm). Wait a few seconds to allow fans to spin down before fully removing the fan tray.
Important:
Have the replacement fan tray available and ready to be installed before starting the replacement
procedure.
Replace the Upper Fan Tray
Step 1
At the front of the chassis, remove the cover panel from the top of the chassis. Firmly grasp the side edges of the panel
and pull up and away to unsnap the panel. Put the panel safely aside. See figure below.
and pull up and away to unsnap the panel. Put the panel safely aside. See figure below.
Step 2
Loosen the screws and remove the upper fan tray access panel from the chassis. Place it safely aside.
Step 3
Loosen the two screws that secure the fan tray to the chassis.
Step 4
Grasp the center pull and pull the failed fan tray unit from the chassis.