HP DL360 Power basics for IT professionals - Page 20

Uninterruptible Power Supplies (UPS)

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For more information about the extensive PDU product portfolio, please see the following URLs: http://h18004.www1.hp.com/products/servers/proliantstorage/power-protection/pdu.html. www.hp.com/servers/technology. And, for more information about the use of three-phase power within the rack, please see the technical brief entitled, "Critical factors in intra-rack power distribution planning for high density systems" at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01034757/c01034757.pdf Uninterruptible Power Supplies (UPS) The continuous supply of quality power is critical to commercial and industrial process installations. A power failure, or even a minor disturbance in the power supply, can interrupt the process and eventually result in a system shutdown. This could cause substantial financial losses or even jeopardize the safety of human lives. Therefore, the key function of the UPS systems is to ensure the supply of electrical power to installations that cannot tolerate even the slightest voltage interruption or inconsistency. Unfiltered electrical power supplied by utilities may cause harmonics, sags, spikes, or other noise-all negative power irregularities. Introducing a UPS system will effectively eliminate these types of disturbances. Most importantly, during power failure conditions, the UPS will bridge the critical power supply gap. In these instances, the system automatically switches to a battery bank to draw the required electrical power until the main service is re-established. This switching occurs without affecting the load performance. The size of the battery banks and eventual alternative power source depend on the system and battery performance. Modern UPS systems provide auxiliary functions such as automatic monitoring, system performance, and alarm displays, in addition to their primary function of supplying power when the main power fails. Many factors must be considered when choosing a UPS. HP recommends consulting a reputable UPS vendor whose professional engineering consultants can assist in defining the proper UPS system to connect to the electrical system. 20

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For more information about the extensive PDU product portfolio, please see the following URLs:
.
www.hp.com/servers/technology
.
And, for more information about the use of three-phase power within the rack, please see the
technical brief entitled, “Critical factors in intra-rack power distribution planning for high density
systems” at
Uninterruptible Power Supplies (UPS)
The continuous supply of quality power is critical to commercial and industrial process installations. A
power failure, or even a minor disturbance in the power supply, can interrupt the process and
eventually result in a system shutdown. This could cause substantial financial losses or even
jeopardize the safety of human lives. Therefore, the key function of the UPS systems is to ensure the
supply of electrical power to installations that cannot tolerate even the slightest voltage interruption or
inconsistency. Unfiltered electrical power supplied by utilities may cause harmonics, sags, spikes, or
other noise—all negative power irregularities. Introducing a UPS system will effectively eliminate these
types of disturbances.
Most importantly, during power failure conditions, the UPS will bridge the critical power supply gap.
In these instances, the system automatically switches to a battery bank to draw the required electrical
power until the main service is re-established. This switching occurs without affecting the load
performance. The size of the battery banks and eventual alternative power source depend on the
system and battery performance.
Modern UPS systems provide auxiliary functions such as automatic monitoring, system performance,
and alarm displays, in addition to their primary function of supplying power when the main power
fails.
Many factors must be considered when choosing a UPS. HP recommends consulting a reputable UPS
vendor whose professional engineering consultants can assist in defining the proper UPS system to
connect to the electrical system.
20