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good news</div>
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is the resistance of 10 mohms higher than wha t is expected</div>
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hove pablo and you checked all the connection points</div>
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dont understand much</div>
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why is the limit set to 35v</div>
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why is it not changeable to a higher value</div>
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are you at the power rating os the supply</div>
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wdll talk tomorrow</div>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif;"><b>From:</b> dsg-halla_moller <dsg-halla_moller-bounces@jlab.org> on behalf of beng--- via dsg-halla_moller <dsg-halla_moller@jlab.org><br>
<b>Sent:</b> Monday, September 29, 2025 16:26<br>
<b>To:</b> dsg-halla_moller@jlab.org <dsg-halla_moller@jlab.org><br>
<b>Subject:</b> [dsg-halla_moller] [New Logentry] TM3 to full nominal current of 3370 A</span>
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<h1 class="node-title"><a href="https://logbooks.jlab.org/entry/4458343" rel="bookmark" style="text-decoration: none;">TM3 to full nominal current of 3370 A</a></h1>
<p class="author-datetime" style="margin: 0.1em 0px;"><b>Lognumber <a href="https://logbooks.jlab.org/entry/4458343" class="lognumber" data-lognumber="4458343" style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;">
4458343</a>. Submitted by <a href="https://logbooks.jlab.org/user/beng" style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;">
beng</a> on <time datetime="2025-09-29T16:22:43-0400"></p>
<p class="author-datetime" style="margin: 0px;"><a href="https://logbooks.jlab.org/entries?start_date=1759173763&end_date=1759180963&book=DSGLOG&book=MOLLER" style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;">Mon, 09/29/2025 - 16:22</a></p>
<p class="author-datetime" style="margin: 0px;"></p>
</time>.</b>
<p></p>
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<div class="field-vitals" style="text-align: left;">Logbooks:</div>
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<td class="field-vitals" style="text-align: left; padding: 0.1em; vertical-align: middle; width: auto;">
<div class="field-vitals" style="text-align: left;"><a href="https://logbooks.jlab.org/book/dsglog" style="text-decoration: none;">DSGLOG</a>
<a href="https://logbooks.jlab.org/book/moller" style="text-decoration: none;">MOLLER</a></div>
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<div class="field-vitals" style="text-align: left;">Entry Makers:</div>
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<div class="field-vitals" style="text-align: left;">campero, ghoshal, dodge</div>
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<div class="field-vitals" style="text-align: left;">References:</div>
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<div class="field-vitals" style="text-align: left;"><a href="https://logbooks.jlab.org/entry/4458169" style="text-decoration: none;">4458169 - TM3 to 1000A</a></div>
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<p class="logentry node-content">Pablo and I verifed that all channels of the voltage comparators were wired and worked as expected. Namely that when a + voltage was on the upper channel it tripped the upper and a - votlage on the upper it tripped the lower.
Similarly a + voltage on the lower would trip the lower and a - voltage on the lower would trip the upper.</p>
<p class="logentry node-content">All seven channels (one for each coil) on the VCs were verified good. We found 2 cables that needed to be swapped between +/- connections.</p>
<p class="logentry node-content">We then adjusted the balance on channels 1, 6, and 7 since those still tripped at 1200 A. After doing so we were able to reach nominal current, albeit briefly. When running at 3370A the voltage is just under the MPS software
limit of 35 V so eventually the MPS tripped itself due to an overvoltage fault.</p>
<p class="logentry node-content">We tried several places to change this limit but couldn't get anything to work, we've already reached out to OCEM for support.</p>
<p class="logentry node-content">The balance for the remaining 4 channels will be done once this issue is worked around. We also need to set the gain for all channels to lower values as well.</p>
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