Overtemperature Conditions; Isolating Cooling Subsystem Problems - Cisco ASR 9000 Series Installation Manual

Troubleshooting the Cooling Subsystem

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:
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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:
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Isolating Cooling Subsystem Problems

Follow these steps to isolate a problem with the chassis cooling system if you have an overtemperature
condition:
Make sure the fan trays are operating properly when you power on the system. To determine if a fan tray
Step 1
is operating, check the LED indicator on each fan tray front panel:
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Never unplug all the fan trays at the same time.
Caution
Eject and reseat the fan tray making sure the captive screws are securely tightened to a torque of
Step 2
10 +/–1 in-lb.
If the fan tray still does not function, go to Step 3.
Check for –48 VDC power by looking at the LED indicators on each power module:
Step 3
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
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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
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.
OK (green)—Fan tray is functioning properly and receiving –48 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 –48 VDC power supplied to the fan tray. Go to Step 2.
Chapter 4 Troubleshooting the Installation