Cisco Systems manual Cisco XR 12404 Router Installation Guide

Chapter 4 Troubleshooting the Installation

Troubleshooting the Cooling Subsystem

•7 fans

•2 controller cards

•1 connector

Check the following to help isolate a problem with the cooling system:

•Do the fans come on?

Note In noisy environments listen for the fans. Place your hand at the left side of the chassis beside the fan tray assembly to feel for air being forced out the exhaust vents.

•If the fans come on, the –48 VDC line from the power supply to the fan tray assembly is good.

•If the fans do not come on, there could a problem with either the fan tray assembly or the –48 VDC power. Check the OUTPUT FAIL LED on each power supply. If the OUTPUT FAIL LED on a PEM is on, the PEM is faulty and should be replaced.

•If the fans do not come on and the PEM OUTPUT FAIL LED is off (–48 VDC is OK), ensure that the fan tray assembly is seated properly to the backplane connector.

–Remove the fan tray assembly by loosening the two captive screws securing it to the chassis. Pull the assembly out a few inches and firmly push in back in to reseat it. Tighten the two captive screws.

•If the fans do not come on, there could be a problem with the fan tray assembly controller card.

•The following message on your console monitor, indicates that the system has detected an overtemperature condition or out-of-tolerance power inside your router.

Queued messages:

%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown

An overtemperature condition is unlikely at initial startup due to an environmental shutdown. As a precaution, ensure that heated exhaust air from other equipment is not entering the air filter, and that there is sufficient

	Cisco XR 12404 Router Installation Guide
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