HP StorageWorks 2500 HP StorageWorks 2500 Disk System User Guide (5697-5922, N - Page 21

Power supply and blower assembly, Features, Power supply and blower status indicator

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Power supply and blower assembly Figure 6 shows the power supply and blower assembly components. 1 5 6 2 3 4 5 25206a Figure 6 Power supply and blower assembly components 1. Power supply assembly 4. Module latch 2. Status LED 5. Blower tabs (2) 3. AC input connector with bail lock 6. Blower Features Only one operational power supply and one operational blower are required to keep the enclosure fully functional. However, in the event of a component failure, HP strongly recommends that a replacement is installed as soon as possible. NOTE: When a power supply fails, the associated blower is disabled. The power supply circuitry monitors input voltage, current, and temperature. If it detects an unacceptable level of any of these elements, the status indicator turns off and an error is reported to the EMU. The EMU uses the temperature sensor signal to adjust the speed of the blowers. If one blower fails or spins at a reduced speed, the speed of the other blower increases to provide adequate air flow. Power supply and blower status indicator A green LED on the blower (Figure 6-2) indicates the operational status of the power supply and the blower. If either component fails, the LED turns off and an error alarm sounds. The failing component should be replaced as soon as possible. 2500 Disk System user guide 21

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Power supply and blower assembly
Figure 6
shows the power supply and blower assembly components.
3
1
4
5
2
5
6
25206a
Figure 6 Power supply and blower assembly components
1. Power supply assembly
4. Module latch
2. Status LED
5. Blower tabs (2)
3. AC input connector with bail lock
6. Blower
Features
Only one operational power supply and one operational blower are required to keep the enclosure fully
functional. However, in the event of a component failure, HP strongly recommends that a replacement is
installed as soon as possible.
NOTE:
When a power supply fails, the associated blower is disabled.
The power supply circuitry monitors input voltage, current, and temperature. If it detects an unacceptable
level of any of these elements, the status indicator turns off and an error is reported to the EMU.
The EMU uses the temperature sensor signal to adjust the speed of the blowers. If one blower fails or
spins at a reduced speed, the speed of the other blower increases to provide adequate air flow.
Power supply and blower status indicator
A green LED on the blower (
Figure 6
-2) indicates the operational status of the power supply and the
blower. If either component fails, the LED turns off and an error alarm sounds. The failing component
should be replaced as soon as possible.
2500 Disk System user guide
21