4-19
Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
OL-26701-02
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.