Power Requirements; Electrical Requirements And Limitations; Power Quality; Voltage And Frequency Tolerance - HP 3PAR StoreServ 7450c Planning Manual

4 Power Requirements

The following describes all power domains within a HP 3PAR StoreServ 7450 Storage systems.

Electrical Requirements and Limitations

Before physically installing a storage system, verify that the operating site has the necessary electrical
circuitry. Each storage system requires four (200 - 240) Volt, 30 Amp outlets, or two outlets if only
the bottom half of the rack is occupied. For proper redundant power protection, power should be
supplied from two or more power sources. Use the approximate current requirements for storage
system components listed in
power, and heat requirements for a specific system configuration.

Power Quality

The quality of the input power is critical to the performance and reliability of the system. Variations
in the input power can cause a power failure or malfunction. Many of the causes of transient signals
and noise on commercial power lines are difficult to locate or are beyond the customer's control.
To reduce the impact of the irregularities, some form of power conditioning may be needed. Consult
your electrician for assistance.

Voltage and Frequency Tolerance

Steady state voltage must be maintained within 10% of the normal rated voltage, measured (under
load) at the power input terminal of the specified server. The frequency must be maintained at
(50-60 HZ), 1 phase 50/60 +2%, -4%.
When there is a possibility of brownouts or other marginal voltage conditions, installing a voltage
monitor is advisable.
Systems are tested to comply with the IEC/EN 61000–4–5 standard.
HP recommends installing a lightning protection device on the server room power source when
the following conditions exist:
The primary power is supplied by an overhead power service.
The utility company installs lightning protectors on the primary power source.
The area is subject to electrical storms or equivalent types of power surges.

Electrostatic Discharge

Storage systems are susceptible to failure due to Electrostatic Discharge (ESD). Electrostatic charges
can accumulate on people and furniture because of direct contact with floor coverings or movement
while in contact with furniture coverings. Discharge of static electricity to a metal surface on server
racks can interfere with the system operation and cause discomfort to anyone who comes in contact
with it.
Some factors contributing to electrostatic discharge are the following:
High-resistance floor covering
Carpeting without antistatic properties
Low humidity (less than 20%)
The system is tested to comply with the IEC/EN 61000–4–2 standard.

Branch Circuits

The individual panel branch circuits should be protected by suitable circuit breakers properly rated
according to manufacturer specifications and applicable codes. Each circuit breaker should be
22 Power Requirements
"Power and Heat Specifications" (page 13) to estimate the current,