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The cooling system is designed to keep system components at an optimal
operating temperature. It is important to keep the front and rear doors
free of obstructions, leaving a minimum clear space of 1.5 meters (59
inches) in the front and 1 meter (39 inches) in the rear between cabinets to
maximize airflow (see Figure 1-1).
The blower, located in the center of the cabinet, draws air downward
through the power regulators and LSB card cage. It draws air upward
through the PIUs. Filler modules, located in the LSB card cage, help to
direct airflow. Air is exhausted at the middle of the cabinet front and
rear. The blower speed varies based on the system's ambient temperature.
The cooling system has safety detectors: static air pressure sensors and a
temperature sensor. The static air pressure sensors measure the air pres-
sure across the LSB card cage. If air pressure drops below a certain level
across these units, DC power is disabled. The temperature sensor meas-
ures the ambient air temperature of the system. If the temperature sensor
is tripped, the system could shut down. If either condition occurs, call your
Digital customer service engineer.
CAUTION: Anything placed on top of the cabinet could restrict airflow.
This will cause the system to power down.
For more information:
Basic Troubleshooting
System Components 2-13
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