HP BladeSystem p-Class rack-centralized (3U) power solutions

The HP BladeSystem p-Class 3U power subsystem provides hot-plug, fully redundant power for
multiple server blade enclosures that would typically be deployed in racks in a data center
environment. Single-phase or three-phase power options are available.
Power enclosure
Customers can use either a single-phase power enclosure or a three-phase power enclosure. There are
four different 3U power enclosures:
• Single-Phase NA/JPN (redundant 200 – 240V AC, L6-30p 30 amp inputs)
• Single-Phase International (redundant 200 – 240V AC, IEC 309 4-Pin 32 amp inputs)
• Three-Phase NA/JPN (redundant 208V, L15-30p 30 amp 3-phase delta 4 wire inputs)
• Three-Phase International (redundant 200/380 – 240/415V, IEC309 5-pin 32 amp 3-phase wye 5
wire inputs)
The single-phase power enclosure holds up to four, 3000-watt hot-plug power supplies. The three-
phase power enclosure holds up to six hot-plug power supplies.
Customers who have a direct facility power source of –48 VDC can use the DC Power Connection
option kit to distribute power directly to the server blade enclosures without the use of the power
enclosures.
Power management module
Attached to the back of each server blade enclosure is a server blade management module. The
management module is a self-contained microcontroller that communicates with the Integrated Lights-
Out (iLO) management device on each server blade. The server blade management module also
communicates with the power management module in the power enclosure. The power management
module monitors the power supplies and power enclosure, delivers alerts and status data to the server
blade management module, supplies power zone information, and determines during the auto power-
up sequence if adequate power is available for newly installed server blades.
Power distribution
Power is carried from the power supplies in the power enclosure(s) to the server blade enclosures
through one of three power distribution options: mini bus bars, scalable bus bars, or a bus box for a
one-to-one connection. The bus bars are attached directly to the RETMA rails in a rack and provide
power independently to each side (A and B) of the server blade enclosure. The Appendix gives
additional details about the power distribution options.
Power zones
Setting the power zone associates the server blade enclosure with the power enclosure that supports
it. This allows power information and alerts to be sent to the proper power management module or
server blade management module when power conditions change. For example, if an administrator
removes a power supply from an enclosure, the information is sent to the server blade enclosures that
are affected (the ones in that power zone).
Power zones also define the startup sequence of the server blades. The server blade enclosures and
the power enclosures in the rack communicate to ensure that the server blades and enclosures are
powered up in sequence rather than all at once, to prevent an extremely high load being placed on
the AC infrastructure. The power-up sequence always runs from the top of the rack, top left server
blade through the top and bottom row of the server blades in that enclosure (if HP ProLiant BL30p or
HP ProLiant BL35p server blades are installed). The sequence then proceeds down to the next
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