84 lines
5.7 KiB
HTML
84 lines
5.7 KiB
HTML
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<meta name="DC.Title" content="Weak battery condition signal from uninterruptible power supply" />
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<meta name="abstract" content="When the battery on the system falls below a specific level of charge, the uninterruptible power supply will issue a weak battery condition signal." />
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<title>Weak battery condition signal from uninterruptible power supply</title>
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</head>
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<body id="rzahrwkbatco"><a name="rzahrwkbatco"><!-- --></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">Weak battery condition signal from uninterruptible power supply</h1>
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<div><p>When the battery on the system falls below a specific level of
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charge, the uninterruptible power supply will issue a weak battery condition
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signal.</p>
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<div class="p">The weak battery signal from the uninterruptible power supply will cause
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the system to perform a power loss controlled shutdown if the following conditions
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are true: <ul><li>You have chosen to use the four wire communication between the iSeries™ server
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and a uninterruptible power supply.</li>
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<li>The utility fail signal is active.</li>
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</ul>
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</div>
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<p>The controlled shutdown occurs immediately. If the system is running on
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utility power and the uninterruptible power supply sends a weak battery signal,
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the system remains up and posts a CPIO964 message. However, the system initiates
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a shutdown mechanism immediately under this condition if utility power is
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lost.</p>
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<p>A typical factory-preset time for an uninterruptible power supply to send
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a weak battery signal is with approximately two minutes of runtime remaining.
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Some uninterruptible power supply models have an adjustable setting for this
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time. Ideally, you want to set it for the amount of time it takes for your
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system to perform a power loss controlled shutdown. Do not assume that the
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factory preset time on the uninterruptible power supply is sufficient for
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a normal shutdown of your system. Calculate the amount of time necessary to
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perform a power loss controlled shutdown and use an appropriate value for
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QUPSDLYTIM and adjust the time for weak battery signal on the uninterruptible
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power supply (if adjustable).</p>
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<p>The figure shows the time progression of the QUPSDLYTIM function, from
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left to right.</p>
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<div class="fignone" id="rzahrwkbatco__rv2w163"><a name="rzahrwkbatco__rv2w163"><!-- --></a><span class="figcap">Figure 1. Time Line of QUPSDLYTIM Function</span><br /><img src="rv4n353.gif" alt="Timeline of QUPSDLYTIM function from power loss to system shutdown" /><br /></div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzahrqupsdlytimtimeline.htm">Explanation of illustration for time line of QUPSDLYTIM function</a></strong><br />
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</li>
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</ul>
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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="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="rzahrupsco.htm" title="An uninterruptible power supply provides a source of ac power if utility power should fail. Typically, uninterruptible power supplies have a finite backup time.">Uninterruptible power supply</a></div>
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<div><a href="../phyplan/plankickoff.htm">Planning for hardware and software</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzahrupsmsgrf.htm" title="Use this topic to learn about error messages related to uninterruptible power supply.">Uninterruptible power supply messages</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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