Power Subsystem
007-4276-001
13
The SGI 1450 server uses a redundant (2+1) power subsystem. To form a (2+1) redundant
power subsystem, the subsystem parallels the DC output of one power supply module
with one or two other modules. If one module ceases to function normally, the remaining
modules provide power to the server system and the system continues to function
properly. Two power supply modules are required to provide power to a fully configured
SGI 1450 server. The third module provides redundancy. A fully configured system
includes four processors, sixteen gigabytes of memory, one floppy drive, one CD-ROM,
five hard drives, and eight PCI add-in boards.
The baseboard contains three embedded voltage converters: two 5 V input and one 12 V
input. The baseboard also provides three connectors supporting 8.3-compliant, plug-in
voltage regulator modules (VRMs).
Each power subsystem auto-senses within the following voltage ranges and is rated as
follows:
•
100-120 V~ at 50/60 Hertz (Hz); 11.0 A maximum
•
200-240 V~ at 50/60 Hz; 5.5 A maximum
The DC output voltages of each power supply module are:
•
+3.3 V at 28 A max (total combined power of the +3.3 and +5 channels must not
exceed 195 W)
•
+5 V at 32 A max (total combined power of the +3.3 and +5 channels must not
exceed 195 W)
•
+12 V at 12.0 A with 15.0 A peak
•
-12 V at 0.5 A
•
+5 V standby at 2 A whenever AC power is supplied to the server system
The DC output voltages of the power subsystem with two or three modules are:
•
+3.3 V at 50 A max (total combined power of the +3.3 and +5 channels must not
exceed 351 W)
•
+5 V at 58 A max (total combined power of the +3.3 and +5 channels must not
exceed 351 W)
•
+12 V at 22.0 A with 28.0 A peak
•
-12 V at 0.5 A
•
+5 V standby at 2 A
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