Silicon Graphics 1450, Maintenance Manual

Page: 28 / 162

12 007-4276-001
1: Detailed Chassis Description
Figure 1-6 Power Subsystem
Warning:
The total power requirement for the SGI 1450 server exceeds the 240 VA
energy hazard limit that defines an operator-accessible area. Only qualified service
technicians should access the processor, memory, power subsystem, and non-hot-plug
areas of the baseboard.
The power subsystem consists of a power subsystem bay, with up to three power supply
modules. The power supply modules are noted by “A” in Figure 1-6. The power
subsystem bay contains a power distribution board, which manages the power delivered
by all functional power supplies.
The power subsystem can operate in either a nonredundant or redundant manner.
Nonredundant operation means that you are using only one or two power supply
modules. If the module ceases to function normally, the server system cannot function
properly, if at all. A minimal configuration supported by one module is one processor,
four memory DIMMs, one hard drive slower than 10,000 PRM, one floppy drive, and one
CD-ROM.
A