NonStop NS2400 Series Planning Guide

Uninterruptible Power Supply (UPS)
NOTE: A NonStop NS2400 series system supports the HP model R5000 UPS for a single-phase
power configuration and the HP model R12000/3 UPS for a three-phase power configuration.
Modular cabinets do not have built-in batteries to provide power during power failures. To support
system operation and ride-through support during a power failure, NonStop NS2400 series systems
require either an optional UPS installed in each modular cabinet or a site UPS to support system
operation through a power failure. This system operation support can include 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.
OSM provides this ride-through support during a power failure. When OSM detects a power
failure, it triggers a ride-through timer. To set this timer, you must configure the ride-through time
in SCF. For more information, see the SCF Reference Manual for the Kernel Subsystem. If AC power
is not restored before the configured ride-through time period ends, OSM initiates an orderly
shutdown of I/O operations and processors. For more information, see “AC Power Monitoring”
(page 71).
NOTE: Retrofitting a system in the field with a UPS and ERMs will likely require moving all installed
enclosures in the rack to provide space for the new hardware. One or more of the enclosures that
formerly resided in the rack might be displaced and therefore have to be installed in another rack
that would also need a UPS and ERMs installed. Additionally, lifting equipment might be required
to lift heavy enclosures to their new location.
For information and specifications on the UPS that is supported for a single-phase power
configuration, see Chapter 4 (page 52) and refer to the HP UPS R5000 User Guide at:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02945229/c02945229.pdf
For information and specifications on the R12000/3 UPS that is supported for a three-phase power
configuration, see Chapter 4 (page 52) and the HP 3 Phase UPS User Guide at:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01079392/c01079392.pdf
If you install a UPS other than the HP model R5000 or R12000/3 UPS in each modular cabinet
of a NonStop NS2400 series system, these requirements must be met to insure the system can
survive a total AC power fail:
• The UPS output voltage can support the HP PDU input voltage requirements.
• The UPS phase output matches the PDU phase input. For details, see Chapter 4 (page 52).
• The UPS output can support the targeted system in the event of an AC power failure. Calculate
each cabinet load to insure the UPS can support a proper ride-through time in the event of a
total AC power failure. For more information, see “Enclosure Power Loads” (page 70).
NOTE: A UPS other than the HP model R5000 or R12000/3 will not be able to utilize the
power fail support of the Configure a Power Source as UPS OSM action.
IMPORTANT: You must change the ride-through time for an HP-supported UPS from the
manufacturing default setting to an appropriate value for your system. During installation of a
NonStop NS2400 series system or HP UPS, your service provider can refer to the "Setting the
Ride-Through Time and Configuring for Maximized Runtime" procedure in the NonStop NS2200
Series and NS2400 Series Hardware Installation Manual for these instructions.
If your applications require a UPS that supports the entire system or even a UPS or motor generator
for all computer and support equipment in the site, you must plan the site’s electrical infrastructure
accordingly.
48 Site Preparation Guidelines for NonStop NS2400 Series Systems