Troubleshooting The Fan Assembly - Cisco 7600-SIP-400 - SPA Interface Processor 400 Installation Manual

Troubleshooting the Fan Assembly

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The AC and DC power supplies have their own self-contained cooling fans. So, depending on the
required airflow, all the fans in the tray increase or decrease their rotation speed collectively. Thermal
sensors (inlet, exhaust, and hot-spot) located throughout the chassis are used to monitor temperature
readings and correct system cooling errors and faults. The supervisor software controls the speed of the
fan and the related alarms raised.
Table 4-5
Problem
Power Loss output in the cooling sub-system
Troubleshooting the Fan Assembly
The chassis fan assembly should operate whenever the system power is on. You should see the FAN LED
turn green and should be able to hear the fan assembly to determine whether or not it is operating. If the
FAN LED is red, this indicates that one or more fans in the fan assembly is not operating. You should
contact TAC immediately. See
representative. There are no installation adjustments to make if the fan assembly does not function
properly at the initial startup.
Troubleshooting An Old Fan Module
Table 4-6
Cisco 7600 Series Router Installation Guide
4-6
Temperature sensors on cards and modules throughout the chassis.
Control software
Air filter, inlet and outlet air vents, and bezels.
Impedance carriers for empty chassis slots.
lists the solutions for power loss in the sub-system.
Table 4-5
lists the solutions to force an old fan module to work in single RPs only.
Troubleshooting the Power Loss in the Sub-System
Solution
Complete these steps to troubleshoot the power
loss in the sub-system:
1. Ensure that the fan-tray is installed and
functional
Insert fan-tray and the air filters in the
2.
designated slot.
Note
Ensure that the inlet temperature to the
3.
chassis does not exceed 40 degree celsius.
Install fillers or blanks in the empty slots.
4.
Ensure that the air filters are not choked and
5.
are clean.
Obtaining Technical Assistance, page
Chapter 4
Except for 7609S, all C7600 routers have
fan tray slots located on the left side of the
chassis near to the exhaust side.
6-3, to contact a customer service
Troubleshooting
OL-4503-26