Hot-Swap Power Supplies; System Cooling - NEC Express5800/180Rb-7 User Manual

Hot-swap Power Supplies

The chassis can be configured with two or three 750-watt power supplies in a 2 + 1
redundancy configuration. If you have three supplies installed, you can hot-swap a
failed supply without affecting system functionality. If you have two supplies installed,
they must occupy the left and center bays (as you face the back of the server—see
Figure 1-3). Each supply is designed to minimize EMI and RFI. This system is
designed to operate at 100-120VAC or 200-240VAC.
The DC output voltages of each power supply are:
+3.3 V at 36.0 A max
!
+5 V at 36.0 A max (total combined output of +3.3 V and +5.5 V not to exceed
!
195 W)
+12 V at 36.0 A with 42.0 A <10ms peak
!
+24 V at 100 mA
!
-12 V at 1.0 A
!
+5 V standby 1.0 A
!
Each supply docks to a 36-pin connector on the system midplane.

System Cooling

The server contains two independent cooling subsystems:
The upper system, cooling the front panel, profusion carrier, and I/O carrier
!
(5 + 1 redundancy)
The lower system, cooling the memory modules, peripheral bay, and power supplies
!
(2 + 1 redundancy)
Both subsystems offer redundant cooling capabilities. As shipped from the factory, the
minimum configuration includes six system fans in the upper subsystem and two power
supplies (each has an integrated fan). You can install one additional power supply.
Note:
cooling.
1-8 System Overview
All chassis covers must be on the system for proper