Chapter 4 Troubleshooting the Installation
Troubleshooting the Cooling Subsystem
Blower Module Operation
The blower module maintains acceptable operating temperatures for the internal components by drawing cooling air through a replaceable air filter into the switch fabric and alarm card cage, and then through the line card and RP card cage (see Figure
The blower module contains three fans, a controller card, and two front panel status LEDs. A
–
–
•If the air temperature inside the chassis rises, blower speed increases to provide additional cooling air to the internal components.
•If the internal air temperature continues to rise beyond the specified threshold, the system environmental monitor shuts down all internal power to prevent equipment damage due to excessive heat.
•If the system detects that one or more of the fans in the blower module has failed, it displays a warning message on the system console and displays a blower failure message on the RP alphanumeric display. In addition, the remaining fans go to full speed to compensate for the loss of the failed fan.
Power Supply Operation
Each AC or DC power supply is equipped with a fan that draws cooler air in through the front of the power module and forces warmer out the back of the power shelf.
•If the power source is within the required range, the power supply fan remains on.
•If the fan fails:
–Power supply detects an internal overtemperature condition
–Fault and Temp indicators light
–Power supply sends an overtemperature warning to the system and then shuts down the system.
| Cisco XR 12410 Router Installation Guide |
|
