Replacing Upper or Lower Fan Tray


Replacing Upper or Lower Fan Tray
 
The system’s upper fan tray draws air up through the chassis for cooling and ventilation. It then exhausts the heated air through the vents at the upper-rear of the chassis.
The system’s lower fan tray assembly draws air into the chassis through the front and sides for cooling and ventilation.
Caution: Do not operate the chassis without the fan tray(s) installed. Doing so even for short periods of time may cause the system to overheat and result in component damage.
This chapter provides instructions for the removal and replacement of the upper and lower fan tray assemblies should there be a partial or complete failure of either one.
ESD Caution: During installation, maintenance, and/or removal, wear grounding wrist straps to avoid ESD damage to the components. Failure to do so could result in damage to electrical components and could potentially void your warranty.
Determining Whether a Fan Tray Needs Replacing
The system has several ways to indicate a fan tray failure. The first indicator is that the Status LED on the System Resource Card (SRC) turns red to indicate the failure of a chassis component.
If you see a red Status LED on the SRC, you can determine whether it is a fan tray failure by using the CLI or checking the Simple Network Management Protocol (SNMP) traps that are generated.
Using the CLI
To monitor chassis temperature and fan speed, issue the following command in the CLI’s Execute mode:
show fans
The following is a sample output for this command:
Upper Fan Controller: State=All Running   Speed=Normal Temp=20 (C)
Lower Fan Controller: State=All Running   Speed=Normal Temp=20 (C)
Using SNMP Traps and MIB Objects
The system supports SNMP traps that are triggered for conditions that may indicate the need to change the fan tray. The system provides the following traps:
0: There are no errors. This is the normal operating condition.
2: Multiple fans on the fan tray have failed.
4: A single fan on the fan tray has failed.
8: The redundant fan controller on the fan tray did not respond to the heartbeat signal.
10: An error has occurred on the primary fan controller bus for the fan tray.
20: An error has occurred on the redundant fan controller bus for the fan tray.
40: An inter-bus communication error was experienced between the primary and redundant fan controllers on the fan tray.
80: The fan tray is not present.
 
Removing an Upper Fan Tray that has Failed
Follow the instructions below to remove a failed upper fan tray from the chassis.
Step 1
Step 2
Step 3
Warning: The upper fan tray assembly contains multiple fans that are spinning at a high rate of speed when the system is powered on. If system is powered on, do not touch moving fans. To minimize the risk of personal injury and potential damage to equipment, follow these instructions.
1.
2.
3.
Warning: Die obere Lüfter Schublade enthaelt mehrere Lüfter. Verletzungsgefahr bei Beruehrung der Lüfter. Hohe Umdrehungszahl der Lüfter unter Stromanschluss. Vorsicht nicht beruehren. Um persoenliche Verletzungen und Geraeteschaden zu verhueten bitte Anleitungen beachten.
1.
2.
3.
Step 4
Proceed to the Installing a Replacement Upper Fan Tray section that follows.
 
Installing a Replacement Upper Fan Tray
Follow the instructions below to install the system’s upper fan tray replacement.
Step 1
Step 2
Step 3
Step 4
 
Removing a Lower Fan Tray Assembly that has Failed
Follow the instructions below to remove a failed lower fan tray assembly from the chassis.
 
Step 1
Step 2
Step 3
Warning: The upper fan tray assembly contains multiple fans that are spinning at a high rate of speed when the system is powered on. If system is powered on, do not touch moving fans. To minimize the risk of personal injury and potential damage to equipment, follow these instructions.
1.
2.
3.
Warning: Die obere Lüfter Schublade enthaelt mehrere Lüfter. Verletzungsgefahr bei Beruehrung der Lüfter. Hohe Umdrehungszahl der Lüfter unter Stromanschluss. Vorsicht nicht beruehren. Um persoenliche Verletzungen und Geraeteschaden zu verhueten bitte Anleitungen beachten.
1.
2.
3.
Step 4
Proceed to the Installing a Replacement Lower Fan Tray Assembly section that follows.
 
Installing a Replacement Lower Fan Tray Assembly
Follow the instructions below to install the system's lower fan tray replacement.
 
Step 1
Step 2
Step 3
 
Step 4
Important: The fan tray bay cover is keyed and can only be installed in one direction.
Step 5
What to do with the Failed Fan Tray
If the failed fan tray is still under warranty, return it to the vendor for repair.
If the failed fan tray is out of warranty, contact the vendor to determine if it can be sent in for repair at an additional cost.
For new customers: Refer to the support area of http://www.cisco.com for up-to-date product documentation pertaining to installation, configuration, and maintenance. A valid username and password are required to use this site. Please contact your local sales or service representative for additional information.
For existing customers with support contracts through Starent Networks: Refer to the support area of http://www.starentnetworks.com for up-to-date product documentation pertaining to installation, configuration, and maintenance. A valid username and password are required to use this site. Please contact your local sales or service representative for additional information.
 

Cisco Systems Inc.
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Fax: 408-527-0883