NonStop NS14000 Series Planning Guide (H06.13+)

Power Quality
This equipment is designed to operate reliably over a wide range of voltages and frequencies,
described in “Enclosure AC Input” (page 59). 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
For steps to take to ensure proper power for the servers, consult with your HP site preparation
specialist or power engineer.
Grounding Systems
The site building must provide a power distribution safety ground/protective earth for each AC
service entrance to all NonStop server equipment. This safety grounding system must comply with
local codes and any other applicable regulations for the installation locale.
For proper grounding/protective earth connection, consult with your HP site preparation specialist
or power engineer.
Power Consumption
In NonStop NS14000 series systems, the power consumption and inrush currents per connection
can vary because of the unique combination of enclosures housed in the modular cabinet. Thus,
the total power consumption for the hardware installed in the cabinet should be calculated as
described in “Enclosure Power Loads” (page 59).
Uninterruptible Power Supply (UPS)
Modular cabinets do not have built-in batteries to provide power during power failures. To support
system operation through a power failure, Integrity NonStop NS14000 series servers require either
an optional UPS (such as the HP R5000 UPS or HP R5500 XR UPS) installed in each modular
cabinet or a site UPS to support system operation through a power failure. If using the HP R5000
UPS or HP R5500 XR UPS, you can take advantage of OSM support for a planned orderly shutdown
at a predetermined time in the event of an extended power failure. A timely and orderly shutdown
prevents an uncontrolled and asymmetric shutdown of the system resources from depleted UPS
batteries. For additional information, see “OSM Power Fail Support” (page 98).
You can order an optional HP R5000 UPS for each modular cabinet to supply power to the
enclosures within that cabinet. Up to two extended runtime modules (ERMs) can be included with
the HP R5000 UPS or HP R5500 XR UPS to extend the power back-up time. If you add an HP
R5000 UPS or HP R5500 XR UPS to a modular cabinet in the field, the PDU on the right side is
Uninterruptible Power Supply (UPS) 37