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9-1
CHAPTER
9
Power Supply Unit (PSU) Replacement
This chapter explains the replacement procedures for the power supply unit (PSU). It covers
the following:
■ Section 9.1, “Overview of the PSU” on page 9-1
■ Section 9.2, “Active Replacement and Hot Replacement” on page 9-9
■ Section 9.3, “Cold Replacement” on page 9-13
There are three methods for replacing a PSU: active replacement , hot replacement, and cold
replacement. For the definition of each type of method, see Section 4.1, “Types of
Replacement Procedures” on page 4-2.
The same power supply unit is mounted on the rack-mountable dual power feed option or
power cabinet (see Chapter 24). The orientation of the mounted power supply unit may vary
by 90 degrees, but the replacement procedure is the same. See the procedure described in
subsequent sections.
9.1 Overview of the PSU
This section provides an overview of the PSU and describes its mounting locations.
A PSU receives alternating power, and it distributes 48 V and 12 V of direct current to each
component. PSUs have an N+1 redundancy configuration, and active maintenance can be
performed on them.
FIGURE 9-1 to FIGURE 9-3 show the PSU locations inside the M8000 server. FIGURE 9-4 and
FIGURE 9-5 show the PSU locations inside the M9000 server (base cabinet). FIGURE 9-6 and
FIGURE 9-7 show the PSU locations inside the M9000 server (with an expansion cabinet).
For details of the types and locations of power supply, see Section 4.5, “Power-On/Off of
Main Line Switch” on page 4-27.