Isolating Cooling Subsystem Problems - Cisco ASR 9001 Hardware Installation Manual

Isolating Cooling Subsystem Problems

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
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
• You allow sufficient air flow by maintaining a minimum of 6 inches (15.24 cm) of clearance at both the
Isolating Cooling Subsystem Problems
Use this procedure to isolate a problem with the chassis cooling system if you have an over-temperature
condition:
Procedure
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
• 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
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 +12 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
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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 +12 VDC power supplied to the fan tray. Go to Step 2.
fan tray is receiving +12 VDC:
• If the fan tray is still not functioning, there could be a problem with the fan tray controller card or
an undetected problem in the fan tray cable. Replace the fan tray.
• If the new fan tray does not function, contact a Cisco customer service representative for assistance.
Troubleshooting the Installation