Isolating Cooling Subsystem Problems - Cisco ASR 9000 Series Installation Manual

Troubleshooting the Installation
%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
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
• You allow sufficient air flow by maintaining a minimum of 6 inches (15.24 cm) of clearance at both the

Isolating Cooling Subsystem Problems

Follow these steps to isolate a problem with the chassis cooling system if you have an overtemperature
condition:
Procedure
Step 1
Make sure the fan trays are operating properly when you power on the system. To determine if a fan tray is
operating, check the LED indicator on each fan tray front panel:
• OK (green)—Fan tray is functioning properly and receiving –48 VDC power, indicating that the cables
• 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
Caution
Step 2
Eject and reseat the fan tray making sure the captive screws are securely tightened to a torque of 10 +/–1 in-lb.
If the fan tray still does not function, go to Step 3.
Step 3
Check for –48 VDC power by looking at the LED indicators on each power module:
• If the Pwr OK indicator is on and the Fault indicator is off on each power module, it indicates that the
for the card's hot-spot temperature) as well as temperature measurements from sensors located in each
power module
cage vents.
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.
from the chassis backplane to the fan tray are good.
or the –48 VDC power supplied to the fan tray. Go to Step 2.
Never unplug all the fan trays at the same time.
fan trays are receiving –48 VDC:
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
Isolating Cooling Subsystem Problems
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