System Power; Peripheral Bays - NEC Express5800 series User Manual

System Power

The server may be configured with up to three 600-Watt power supplies. Each supply
has autoranging input 50/60 Hz and automatically switches between the following input
voltage ranges:
!
100-127 VAC at 50/60 Hz
!
200-240 VAC at 50/60 Hz
All output grounds connect to the power supply chassis and to earth ground through the
AC line cord. Each supply has:
!
Individual AC input line cord that plugs into the external side of the power supply
!
Isolating device on each DC output so that the failure of one supply does not affect
the operation of the others
!
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 four-processor
system with two power supplies can be fully loaded (all drive bays and add-in board
slots filled). The power supplies use a forced current-sharing technique that ensures the
supplies share equally within 10 percent at full load. In a high-access system with three
power supplies, the additional supply gives redundancy, because the load is
redistributed if one supply fails. Also with the third power supply installed all the power
supplies are now hot-swappable and can be easily installed or removed from the server
without turning system power off.

Peripheral Bays

The system supports a variety of standard PC AT-compatible peripheral devices. The
chassis includes these peripheral bays:
!
A 3.5-inch front panel bay for mounting the standard 3.5" diskette drive (supports
720 KB and 1.44 MB diskette media)
!
Two 5.25-inch removable media front panel bays for mounting half-height 5.25-inch
peripheral devices: optional tape drives and optional additional CD ROM drive, etc.
!
A front panel bay for mounting the standard CD-ROM drive.
!
One standard and one optional hot-swap SCSI hard disk drive bay for mounting up
to ten SCSI hard disk drives (five disk drives per bay) in easily removable drive
carriers. Each drive has a set of two lights to indicate the fault or other status: power-
on/activity (green LED), and fault (amber LED).
Note:
panel that require an 80-pin single connector attachment (SCA)
connector on the drives that you install.
The SCSI hard disk drive bays contain a hot-swap back
System Overview 1-19