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<h1 class="topictitle1">Weak battery condition signal from uninterruptible power supply</h1>
<div><p>When the battery on the system falls below a specific level of
charge, the uninterruptible power supply will issue a weak battery condition
signal.</p>
<div class="p">The weak battery signal from the uninterruptible power supply will cause
the system to perform a power loss controlled shutdown if the following conditions
are true: <ul><li>You have chosen to use the four wire communication between the iSeries™ server
and a uninterruptible power supply.</li>
<li>The utility fail signal is active.</li>
</ul>
</div>
<p>The controlled shutdown occurs immediately. If the system is running on
utility power and the uninterruptible power supply sends a weak battery signal,
the system remains up and posts a CPIO964 message. However, the system initiates
a shutdown mechanism immediately under this condition if utility power is
lost.</p>
<p>A typical factory-preset time for an uninterruptible power supply to send
a weak battery signal is with approximately two minutes of runtime remaining.
Some uninterruptible power supply models have an adjustable setting for this
time. Ideally, you want to set it for the amount of time it takes for your
system to perform a power loss controlled shutdown. Do not assume that the
factory preset time on the uninterruptible power supply is sufficient for
a normal shutdown of your system. Calculate the amount of time necessary to
perform a power loss controlled shutdown and use an appropriate value for
QUPSDLYTIM and adjust the time for weak battery signal on the uninterruptible
power supply (if adjustable).</p>
<p>The figure shows the time progression of the QUPSDLYTIM function, from
left to right.</p>
<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>
</div>
<div>
<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rzahrqupsdlytimtimeline.htm">Explanation of illustration for time line of QUPSDLYTIM function</a></strong><br />
</li>
</ul>
<div class="familylinks">
<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>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<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>
<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>
<div><a href="../phyplan/plankickoff.htm">Planning for hardware and software</a></div>
</div>
<div class="relref"><strong>Related reference</strong><br />
<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>
</div>
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