Sparc Enterprise M3000, Installation Manual

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Appendix C DC Power Supply Model C-5
FIGURE C-3
Power Cords With a Dual-Power Feed Connection
C.1.4 Grounding
The DC power supply model of the M3000 server is shipped with two DC power
cords. Since these DC power cords have a connector only for the server end, a
terminal matching the DC power supply equipment will need to be attached to the
DC power supply end of the cord. Moreover, the power supply equipment must be
correctly grounded. Confirm that the grounding prong is connected to the positive
bus on the battery box.
The grounding resistance must not be greater than 10
Ω
. The grounding method
varies by the building where you install the server. Make sure that the facility
administrator or a qualified electrician verifies the grounding method for the
building and performs the grounding work.
PSU#1 PSU#0
Rectifier
Battery
CB
CB
AC
RTN
-48 Vdc to -60 Vdc
-48 Vdc to -60 Vdc
RTN
FG
FG
CB: Circuit breaker
AC
Ground point
Ground point
Branch connection
Customer facilities