User guide

4–10 Site preparation
Hitachi Unified Storage VM Block Module Hardware User Guide
• An insulated grounding conductor that is identical in size and insulation
material and thickness to the grounded and ungrounded branch-circuit
supply conductors. It must be green, with or without yellow stripes, and
must be installed as a part of the branch circuit that supplies the unit or
system.
• The grounding conductor described above should be connected to earth
ground at the service equipment or other acceptable building earth
ground. In the case of a high rise steel-frame structure, this can be the
steel frame
• The attachment-plug receptacles in the vicinity of the unit or system
must include a ground connection. The grounding conductors serving
these receptacles must be connected to earth ground at the service
equipment or other acceptable building earth ground.
Power connection
The AC power input for the HUS VM storage system has a duplex PDU
structure that enables the equipment installed in the entire rack to remain
powered on if power is removed from one of the two power distribution
panels.
PDU plugs, circuit breakers, and receptacles
The PDU plugs must be appropriate for the power sources at the installation
sites. Table 4-9: PDU plugs, circuit breakers, and receptacles on page 4-10
lists the plugs on the end of the PDU power cords. The power distribution
panel at the installation site must have receptacles that match these plugs.
Table 4-9: PDU plugs, circuit breakers, and receptacles
Note: Site power can be connected to the PDUs at either the top or
bottom of the racks.
Note: Depending on the configuration, the HUS VM storage system may
draw considerably less power than the rating of the PDU plugs. Use the
weight and power calculator to determine the power draw for a specific
system. See the note under Electrical specifications on page 4-9.
Phas
e
Location PDU Plug
Max
Voltage
Rating
Max
Current
Rating
No. of CB
per PDU
Breake
r
Rating
Power Supply
Receptacle
Single USA NEMA L6 30P
twistlock
2 pole, 3 wire
A + B + gnd
250 V 32 A 2 16 A,
20 A trip
2 pole, 3 wire
220 VAC
A + B + gnd
Outside
USA
IEC 309, blue
2 pole, 3 wire
A + B + gnd
250 V 32 A 2 16 A,
20 A trip
2 pole, 3 wire
220 VAC
A + B + gnd