Blowers; Status Reporting - Compaq TA1000 Reference Manual

Blowers

The power supply-mounted blowers cool the enclosure by circulating air
through the enclosure and elements. The rate at which air moves (the airflow)
determines the amount of cooling. This airflow is a function of blower speed
(rpm). These blowers, under the control of the EMU or the associated power
supply, can operate at multiple speeds. This ensures that when the enclosure
temperature changes the blowers can automatically adjust the airflow.
If a blower operates too slowly or stops (a "blower failure") internal circuitry
automatically causes the operational blower to operate at a higher speed.

Status Reporting

The green status LED on the blower displays the status of both the power
supply and the blower. See Table 6-1 for definitions of the LED displays.
When the blower and the power supply are operational:
Both the power supply and the blower are operational.
Either the power supply or the blower locate function is active.
When either the blower or the power supply is nonoperational:
Either the power supply or the blower is nonoperational. When there is a blower
problem, the other blower runs at a higher speed.
Recommended Corrective Action
1. Check the power supplies for proper operation. Replace if defective.
2. Check the blower for proper operation. Replace if defective.
WARNING: The blower blades rotate at a high speed and do not stop
immediately when power is removed. Avoid touching the rotating blades when
removing the blower.
Power Supply and Blower Status Displays
LED is On
Table 6-1
LED is Off
Power and Cooling 6-3
LED is Flashing