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4-26 SPARC Enterprise M8000/M9000 Servers Service Manual • June 2010
4.5.1.2 Power System
There are two types of power system: single power and dual power.
FIGURE 4-3 shows the conceptual diagram of power system.
FIGURE 4-3 Power System (Single Power / Dual Power)
The dual power feed option receives power from two external AC power sources
that are independent of each other, and it duplicates the input power system.
The dual power feed can be used with either single-phase or three-phase power
feed.
4.5.2 Power-On/Off Procedures of Main Line Switch
On the server with expansion cabinet, when you turn on or turn off the main line
switch, do not fail to follow the order described below.
PSU
ACS
AC
PSU
PSU
ACS
ACS
AC
AC
Single power feed
Dual power feed
Distribution panel
Distribution panel
Distribution panel
Cabinet
Cabinet