HP L1000 - 9000 - 0 MB RAM, User Manual

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Appendix B
System Specifications
Electrical
185
Electrical
The HP rp54xx power system is comprised of one, two or three autoranging, 12A/10A/5A, 930W
hot-swappable system power supplies, depending on how the system is configured. The maximum 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.