Power supplies, Blowers – HP 3000 Enterprise Virtual Array User Manual
Page 50
Power supplies
The two power supplies mount in the rear of the enclosure. See
. The supplies are autoranging
and operate on a country-specific AC input voltage of 202 to 240 VAC ±10%, 50 to 60 Hz, ±5%, (188
to 264 VAC, 47 to 63 Hz).
The DC outputs of this power supply are:
•
+5.1 VDC for the EMU, I/O module,
, and disk drives
•
+12.1 VDC for the disk drives
•
+12.5 VDC for the disk drives
The output of each power supply is 499W, with a peak output of 681W. 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
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 blower 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.
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Enterprise Virtual Array hardware components