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B-28 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
B.17 AC Section
The AC section (ACS) is positioned at the input side of the power supply unit (PSU), to
protect the system from electromagnetic interference (EMI).
There are two types of ACS, ACS for M8000 and ACS for M9000. Both single-phase AC
and three-phase AC types are available for both types. ACS consists of a terminal strip for
power input, a main line switch, and so on. Among the ACS, ACS_D is a unit for supplying
the internal current to the three-phase power feed cabinet, which doesn't have a main line
switch and the external connection.
FIGURE B-20, FIGURE B-21, FIGURE B-22, FIGURE B-23, FIGURE B-24, FIGURE B-25,
FIGURE B-26, and FIGURE B-27 show the ACS.
■ The ACS_A is a single-phase power feed unit for the M8000 server. This unit uses three
power cords to receive power and distribute AC power to nine PSUs.
FIGURE B-20 AC Section (ACS_A)
■ The ACS_B is a single-phase power feed unit for the M9000 server and the M9000 server
single-phase dual power feed cabinet (option). This unit uses five power cords to receive
power and distribute AC power to 15 PSUs.