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Appendix B Components B-27
B.16 Power Supply Unit
The power supply unit (PSU) receives AC 200 to 240 V, and supplies each unit of the server
with DC 48 V and 12 VL. When all CMUs and IOUs are mounted without the dual power
feed option, nine units for the M8000, 15 units for the M9000 (base cabinet only) and 30
units for the M9000 (with expansion cabinet) will be mounted. The number of mounted units
also vary with the system configuration.
The PSU is shown in
FIGURE B-19.
FIGURE B-19 Power Supply Unit (PSU)
The PSU has the following characteristics.
■ Because PSUs are normally operating in redundancy, active maintenance of a failed PSU
during system operation is possible.
■ The internal power factor correction (PFC) circuit secures the stable output and
suppresses the harmonic current that adversely affects the environment.
■ The current balancing function enables the concurrent operation of a large number of
PSUs, allowing the redundant configurations.
■ The PSU has a label bearing the printed component number and manufacture's serial
number.