Compaq StorageWorks 1000 - Modular Smart Array Manuel de service télécharger pdf (Page 26)

Power supply/fan assembly LEDs

Each power supply/fan assembly has one LED.

The LED is illuminated when both the power supply and the fan are operational. When a power supply

or fan fault occ

urs, the LED goes off. If the LED is off, AC power is not present or there is a complete

power supply f

ailure.

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The power-supply-mounted fans cool the chassis by circulating air through the enclosure. The rate at

which air moves (the airﬂow) determines the amount of cooling. This airﬂow is a function of fan speed

(rpm). These fans, under the control of the Environmental Monitoring Unit (EMU) or the associated power

supply, c

an operate at multiple speeds. This ensures that when the enclosure temperature changes, the

fans can a

utomatically adjust the airﬂow. If one fan operates too slowly or completely shuts off, the

other fan operates at a higher speed. At the same time, the error condition is reported to the user

via the LCD panel on the front of the controller.

System components and LEDs

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Compaq StorageWorks 1000 - Modular Smart Array Manuel de service Page 26