60 lines
4.3 KiB
HTML
60 lines
4.3 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Uninterruptible power supply" />
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<meta name="abstract" content="An uninterruptible power supply provides a source of ac power if utility power should fail. Typically, uninterruptible power supplies have a finite backup time." />
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<meta name="description" content="An uninterruptible power supply provides a source of ac power if utility power should fail. Typically, uninterruptible power supplies have a finite backup time." />
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<meta name="DC.Relation" scheme="URI" content="rzahrconcepts.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahrctldwnco.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahrdlytimco.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzahrwkbatco.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rzahrupsco" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Uninterruptible power supply</title>
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</head>
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<body id="rzahrupsco"><a name="rzahrupsco"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Uninterruptible power supply</h1>
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<div><p>An uninterruptible power supply provides a source of ac power if
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utility power should fail. Typically, uninterruptible power supplies have
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a finite backup time.</p>
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<p>An uninterruptible power supply supplies power to the system and all associated
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disk unit controllers and devices during a utility power failure. The runtime
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of the uninterruptible power supply should be sized appropriately for a power
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loss controlled shutdown.</p>
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<p>Three system values affect an uninterruptible power supply. These system
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values define the action the system takes in response to a change in the power
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supply signal when an uninterruptible power supply is attached:</p>
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<ul><li><a href="rzahrmsgqco.htm#rzahrmsgqco">QUPSMSGO</a></li>
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<li><a href="rzahrdlytimco.htm#rzahrdlytimco">QUPSDLYTIM</a></li>
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<li><a href="rzahrpwrrstco.htm#rzahrpwrrstco">QPWRRSTIPL</a></li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahrconcepts.htm" title="Before you use a power-handling program to control system shutdown, you may want to familiarize yourself with related concepts.">Controlled shutdown concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahrctldwnco.htm" title="The power loss-controlled shutdown mechanism allows the system to shut down in an orderly fashion following a loss of utility power. The power loss-controlled shutdown mechanism is available only if you connected the system to an uninterruptible power supply.">Power loss controlled shutdown</a></div>
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<div><a href="rzahrdlytimco.htm" title="QUPSDLYTIM is the system value for the Uninterruptible power supply delay timer.">Uninterruptible power supply delay time system value (QUPSDLYTIM)</a></div>
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<div><a href="rzahrwkbatco.htm" title="When the battery on the system falls below a specific level of charge, the uninterruptible power supply will issue a weak battery condition signal.">Weak battery condition signal from uninterruptible power supply</a></div>
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</div>
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</div>
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</body>
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</html>
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