Power Supplies - HP Rack Storage/12 Installation Manual

Chapter 1

Power Supplies

Two hot-swap power supplies are installed in the HP Rack Storage/12. Each
power supply includes an attached fan module. Power supply operation is
controlled by the power switch on the rear panel of the HP Rack Storage/12.
NOTE 5 VDC standby power is supplied to the HP Rack Storage/12
even when the power switch is set OFF. To remove standby
power, disconnect both power supplies from their AC sources.
The power supply provides DC power to HP Rack Storage/12 components.
Standby power and fan power are supplied through separate outputs. The power
supply adjusts to the AC power source voltage and frequency through
auto-ranging.
The power load is shared by both power supplies. If a power supply fails, the
remaining power supply provides DC power to HP Rack Storage/12 components.
CAUTION
Do not operate the HP Rack Storage/12 with a open power
supply slot. The chassis can overheat and damage
components.
NOTE Replace a failed power supply as soon as possible. The HP
Rack Storage/12 should not be operated for extended time
periods with only one operating power supply.
The power supply is protected from over-temperature conditions. When this
condition occurs, the power supply is shut down. The power supply will not
operate until the condition is removed and the AC power is cycled.
Fan Module
The variable speed fan module provides cooling airflow inside the HP Rack
Storage/12 chassis. Fan speed is regulated by the Management Board by
monitoring temperature sensors inside the chassis.
DC power is supplied to each fan by a redundant connection to both power
supplies. The fan continues to operate even if the attached power supply fails.
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HP Rack Storage/12 Overview