HP 9000 rp5400 Servers - Manual (Page 139)

power needed by fully-configured server is 1200W. Each power supply requires a dedicated 20A
branch circuit.
CAUTION: HP does not recommend and does not support the use of "ferro-active" or
"ferro-resonant" power correction in conjunction with the rp54xx server. These type of line
conditioners represent an older technology that is not compatible with the most recent designs
in active PFC power supplies such as those in the HP rp54xx servers. "Ferro-active" or
"ferro-resonant" line conditioners may cause an increase in total harmonic distortion and may
produce significant and unpredictable voltage regulation anomalies.
Office High Availability Requirements
Server-level Enhanced Power Availability
At the server level, enhanced power availability is achieved through the n+1 hot-swappable
power supplies.
One power supply is required for a minimally configured rp54xx system operation and in order
to allow the system to boot. If a second power supply is present, one of the two power supplies
can fail without the system shutting down. Similarly, two power supplies are required for a more
heavily-configured rp54xx server. If a third power supply is present, one of the two power
supplies can fail without the system shutting down.
If a third (redundant) power supply is present, all three power supplies become hot-swappable.
Any one of the power supplies can fail without affecting system performance, and can be replaced
while the system is on-line. Single point of failure is reduced to the local wall circuit or PowerTrust
UPS to which the power supply power cords are connected.
Power Protection
Power protection is provided through the use of HP PowerTrust UPSs (Uninterruptible Power
Supplies). The only supported models for rp54xx systems are the 3.0kVA and 5.5kVA models.
Recommendations for other manufacturers and models are not yet determined.
HP rp54xx server power supplies may be plugged directly into the customer's site UPS. However,
customers are advised against plugging the power supply into an HP PowerTrust UPS and then
connecting that UPS to the site UPS.
Modular PDUs
NOTE: The acronym PDU (Power Distribution Unit) in this document refers to the power strips
attached to the HP rp54xx cabinet.
Three modular PDUs are available for use with the rp54xx product:
•
20A modular PDU, HP product number E7674A. This PDU has seven C13 outlets and one
C19 outlet. Note that if this PDU is used to power the rp54xx server, any other peripherals
must have their power supplied by additional PDUs in the cabinet. The PDU power cord
(HP part number 8120-6903) has an L6-20P plug which must be plugged into an L6-20R wall
or floor receptacle.
• 30A modular PDU, HP product number E7681A (North America) or E7682A (International).
This PDU has eight C13 outlets and two C19 outlets, split across two 20A branch circuits
(max. 30A available). The PDU power cord has an L6-30 plug.
Electrical 139