NonStop NS-Series Planning Guide (H06.04+)

Installation Facility Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-005
2-2
EPO Requirement for HP 5500 XP UPS
EPO Requirement for HP 5500 XP UPS
The rack mounted HP 5500 XR UPS that can be optionally installed in a modular
cabinet contains batteries and has an EPO circuit. Consult your HP site preparation
specialist or electrical engineer regarding requirements for site EPO switches or relays.
If an EPO switch or relay contactor is required for your site, contact your HP
representation or refer to the HP UPS R5500 XR User Guide, HP part number 351643,
for connector and wiring. This guide is available at:
http://h10032.www1.hp.com/ctg/Manual/c00065453.pdf
EPO Requirement for NonStop S-Series I/O Enclosure
Each NonStop S-series I/O enclosure contains batteries and an EPO circuit. If an EPO
switch or relay contactor is required for your site, contact your HP representation or
refer to the NonStop S-Series Hardware Installation and FastPath Guide for connector
and wiring information. This guide is an IPDS Publication and is available in the
NonStop Technical Library (NTL).
Electrical Power and Grounding Quality
Proper design and installation of a power distribution system for an Integrity NonStop
NS-series server requires specialized skills, knowledge, and understanding of
appropriate electrical codes and the limitations of the power systems for computer and
data processing equipment. For power and grounding specifications, refer to Modular
Cabinet AC Input Power on page 3-1.
Power Quality
This equipment is designed to operate reliably over a wide range of voltages and
frequencies described in Enclosure AC Input on page 3-4. However, damage can
occur if these ranges are exceeded. Severe electrical disturbances can exceed the
design specifications of the equipment. Common sources of such disturbances are:
•
Fluctuations occurring within the facility’s distribution system
•
Utility service low-voltage conditions (such as sags or brownouts)
•
Wide and rapid variations in input voltage levels
•
Wide and rapid variations in input power frequency
•
Electrical storms
•
Large inductive sources (such as motors and welders)
•
Faults in the distribution system wiring (such as loose connections)
Computer systems can be protected from the sources of many of these electrical
disturbances by using:
•
A dedicated power distribution system
•
Power conditioning equipment
•
Lightning arresters on power cables to protect equipment against electrical storms