Blowers, Drive enclosure emu – HP 4000.6000.8000 Enterprise Virtual Arrays User Manual
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The output of each power supply is 499 W, with a peak output of 681 W. A single power supply
can support an enclosure with a full complement of disks.
The power supply circuitry provides protection against:
•
Overloads
•
Short circuits
•
Overheating
Power supply status and diagnostic information is reported to the EMU with voltage, current, and
temperature signals.
See
“Regulatory notices and specifications” (page 104)
for the enclosure power specifications.
The power supply temperature sensor provides a temperature range signal to the EMU, which uses
this signal to set the
speed.
The power supply internal temperature can also control the speed of the blower. The higher the
power supply temperature, the faster the speed of the blower. If the power supply temperature
exceeds a preset value, the power supply automatically shuts down.
Blowers
The power supply-mounted blowers cool the enclosure by circulating air through the enclosure.
The 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 air flow.
If a blower is operating too slowly or has stopped (a “blower failure”), internal circuitry automatically
operates the remaining blower at a higher speed. Simultaneously, the error condition is reported
in several ways, including the power supply indicator, the audible alarm, the enclosure fault
indicators, and the EMU alphanumeric display.
Should both blowers fail, the power supplies automatically shut down.
NOTE:
The blowers are field-replaceable units and can be replaced, individually, while the
system is running. The blowers are also interchangeable. The failure of a power supply +12.5
VDC circuit disables the associated blower.
The status indicator on the blower displays the status of both the power supply and the blower.
See
. See
for definitions of the indicator displays.
Table 7 Power supply/blower status indicators
Description
Blower status
indicator
Both the power supply and the blower are operational.
On
The power supply or the blower locate function is active.
Flashing
The power supply or the blower is non-operational. When there
is a blower problem, the other blower runs at a higher speed.
Recommended corrective actions:
Off
•
Check blower for proper operation. Replace if defective.
•
Check power supplies for proper operation. Replace if
defective.
Drive enclosure EMU
The EMU provides increased protection against catastrophic failures. The EMU detects conditions
such as failed power supplies, failed blowers, elevated temperatures, and external air sense faults
and communicates these conditions to the storage system controllers.
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Enterprise Virtual Array hardware components