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Power Connection
The AC power input for the Universal Storage Platform VM has a duplex PDU
structure. This duplex structure enables the entire rack to remain powered on
in the event that power is removed from one of the two power distribution
panels (PDPs).
• Direct connection to power. Figure 2-9 shows the power connections
when the AC input lines are connected directly to the power facility.
• Power connection through UPS. Figure 2-10 shows the power
connections when half of the AC input lines are connected to an
uninterruptible power supply (UPS), and the other half of the AC input lines
are connected directly to the power facility.
Caution: When installing the USP VM, be sure to connect the AC cables
between the PDUs and PDPs correctly. If these cables are connected
incorrectly, a system failure will occur when one of the AC inputs is
interrupted.
Figure 2-9 illustrates the correct connections (drawing on the left)
and the incorrect connections (drawing on the right).
PDP1 PDP2
Connect to
same PDP
PDP: Power Distribution Panel
*1: When connected correctly, two of the four PDUs
can supply power to the entire rack.
Correct Connections:
Primary Rack
PDU
(1φ/20A)
Duplex
Structure
Incorrect
Connection
*2
PDP2
Breaker
PDP1
AC Input
Line
PDU
(1φ/20A)
PDU
(1φ/20A)
PDU
(1φ/20A)
*1
*1
Incorrect Connections:
Primary Rack
*2: If connected incorrectly, the two PDUs cannot
supply power to the entire rack, which causes a
system failure.
DKC
DKU-R1
DKU-R0
DKC
DKU-R1
DKU-R0
Figure 2-9 Direct Power Connection
2-16 Installation Requirements
Hitachi Universal Storage Platform VM Installation Planning Guide