System Power; Software Locks Via The Bios Setup - NEC HX4500 User Manual

System Power

The system may be configured with up to three 420 Watt power supplies. Each
supply automatically switches between these input voltage ranges:
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100-120 VAC at 50/60 Hz; 7 A maximum current
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200-240 VAC at 50/60 Hz; 3.5 A maximum current
Each power supply provides DC outputs of +5 V, +12 V, +3.3 V, -5 V, and
-12 V. All output grounds connect to the power supply chassis and to earth
ground through the AC line cord. Each supply has:
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individual AC input line cord that plugs into the external side of the
power supply
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isolating device on each DC output so that the failure of one supply does
not affect the operation of the others
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cooling fan integral with each power supply enclosure. The fan circuit
implements fan failure detection.
In a system, power is drawn equally from all supplies installed. A system with
two power supplies can be fully loaded (all drive bays and add-in board slots
filled). The supplies use a forced current-sharing technique that ensures the
supplies share within 10 percent at full load. In a high-access system with three
power supplies, the third supply gives redundancy, because the load is
redistributed if one supply fails.

Software Locks via the BIOS Setup

The BIOS Setup has software features that let you control access to one or more
parts of the system:
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set and enable an administrative password
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set and enable a user password
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enable password on boot
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disable writing to the diskette drive when secure mode is set.
If only a supervisor password is set and enabled, enter this password to boot the
server and run the SCU.
If both the user and administrative passwords are set and enabled, enter either
one to boot the server. Enter the administrative password to access the SCU or
BIOS Setup to change the system configuration.
1-20 System Overview