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CiscoASR 9000 Series Aggregation Services Router Hardware Installation Guide
Chapter4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
Note Due to air leakage, the chassis should not be operated with any of the fan trays completely missing.
Replace any missing fan tray within five minutes. Any fan tray replacement should be performed when
the chassis is back to room temperature.
Power Module Fans
Each AC or DC power module is equipped with two fans that draw cooling air in through the front of the
power module and force warm air out the back of the power tray:
•If the power source is within the required range, the power supply fan remains on.
•If a fan fails:
–
Power module detects an internal overtemperature condition.
–
Fault and Temp indicators light.
–
Power module sends an overtemperature warning to the system and then shuts down the system.
For additional power supply troubleshooting information, see Troubleshooting the Power Subsystem,
page 4-7.
Note For the RSP/RP to communicate properly to a power module in a power tray, input power to at least one
of the three power modules in the power tray should be present.
Overtemperature Conditions
The following console error message indicates that the system has detected an overtemperature 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 trays
•Temperature measurements received by two sensors on each card (one for inlet air temperature and
one for the card’s hot-spot temperature) as well as temperature measurements from sensors located
in each power module
If an environmental shutdown results from an overtemperature or out-of-tolerance condition, the Fault
indicator on the power supply lights before the system shuts down.
Although an overtemperature 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.