Cisco Systems ASR9001, 9001S Over-temperature Conditions, Isolating Cooling Subsystem Problems

Chapter 4 Troubleshooting the Installation

Troubleshooting the Cooling Subsystem

For additional power supply troubleshooting information, see the “Troubleshooting the Power

Subsystem” section on page 4-3.

Note For the RSP to communicate properly to a power module, input power to at least one of the two power modules should be present.

Over-temperature Conditions

This console error message indicates that the system has detected an over-temperature condition or out-of-tolerance power value inside the system:

Queued messages:

%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown

The preceding message could also indicate a faulty component or temperature sensor. Enter the show environment command or the show environment all command at the user EXEC prompt to display information about the internal system environment. The information generated by these commands includes:

•Voltage measurements on each card from the DC-to-DC converter

•The +5 VDC for the I2C module

•Operating voltage for the fan tray

•Temperature measurements received by all sensors of RP and LC module as well as temperature measurements from sensors located in each power module

If an environmental shutdown results from an over-temperature or out-of-tolerance condition, the Fault indicator on the power supply lights before the system shuts down.

Although an over-temperature condition is unlikely at initial system startup, make sure that:

•Heated exhaust air from other equipment in the immediate environment is not entering the chassis card cage vents.

•You allow sufficient air flow by maintaining a minimum of 6 inches (15.24 cm) of clearance at both the inlet and exhaust openings on the chassis and the power modules to allow cool air to enter freely and hot air to be expelled from the chassis.

Isolating Cooling Subsystem Problems

Use this procedure to isolate a problem with the chassis cooling system if you have an over-temperature condition:

Step 1 Make sure the fan tray is operating properly when you power on the system. To determine if the fan tray is operating, check the LED indicator on the fan tray front panel:

•OK (green)—Fan tray is functioning properly and receiving +12 VDC power, indicating that the cables from the chassis backplane to the fan tray are good.

•Fail (red)—Fault is detected in the fan tray. Replace the fan tray.

•If neither indicator is on and the blower is not operating, there may be a problem with either the fan tray or the +12 VDC power supplied to the fan tray. Go to Step 2.

	Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
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