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No clue why it is only 35V. It should be changeable to any other number.</div>
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This is the software limit in the MPS itself (so nothing to do with our controls), the hardware limit is 70V.</div>
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Right now the max sw current limit is set to 3901 (which is higher than the max hw limit) effectively disabling this.</div>
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We're nowhere close to the power limit of the supply, even though its nearly at max current output, only at barely half the power output.</div>
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<b>From:</b> Amrit Yegneswaran <yeg@jlab.org><br>
<b>Sent:</b> Monday, September 29, 2025 5:29 PM<br>
<b>To:</b> Brian Eng <beng@jlab.org>; dsg-halla_moller@jlab.org <dsg-halla_moller@jlab.org><br>
<b>Subject:</b> Re: [dsg-halla_moller] [New Logentry] TM3 to full nominal current of 3370 A</div>
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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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Get <a data-auth="NotApplicable" class="OWAAutoLink" id="OWAc4bc223a-8d57-3692-faa2-b47e45661682" href="https://aka.ms/o0ukef">
Outlook for iOS</a></div>
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<div style="direction: ltr; 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</div>
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<h1><a style="text-decoration: none;" data-auth="NotApplicable" class="OWAAutoLink" id="OWA99c87403-6f5d-b250-4722-c8fbd8c7ead9" href="https://logbooks.jlab.org/entry/4458343">TM3 to full nominal current of 3370 A</a></h1>
<p style="margin: 0.1em 0px;"><b>Lognumber <a style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;" data-auth="NotApplicable" data-lognumber="4458343" class="x_lognumber OWAAutoLink" id="OWA588616bb-401d-3ce1-5849-8f3b245ef50a" href="https://logbooks.jlab.org/entry/4458343">
4458343</a>. Submitted by <a style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;" data-auth="NotApplicable" class="OWAAutoLink" id="OWA63ea3248-b0dd-faf5-a157-d79a52e8f1a6" href="https://logbooks.jlab.org/user/beng">
beng</a> on <time datetime="2025-09-29T16:22:43-0400"></time></b></p>
<p style="margin: 0px;"><b><a style="text-decoration: none; margin-top: 0px; margin-bottom: 0px;" data-auth="NotApplicable" class="OWAAutoLink" id="OWAbcd551fb-c661-e5e0-5ac4-ec7e6e550353" href="https://logbooks.jlab.org/entries?start_date=1759173763&end_date=1759180963&book=DSGLOG&book=MOLLER">Mon,
09/29/2025 - 16:22</a></b></p>
<div><b>.</b></div>
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<div style="text-align: left;">Logbooks:</div>
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<div style="text-align: left;"><a style="text-decoration: none;" data-auth="NotApplicable" class="OWAAutoLink" id="OWAc7315d31-c79c-b02f-10aa-42d2b6211ca4" href="https://logbooks.jlab.org/book/dsglog">DSGLOG</a>
<a style="text-decoration: none;" data-auth="NotApplicable" class="OWAAutoLink" id="OWA06a2e7c8-c062-fae5-f808-7d9f83bc9e08" href="https://logbooks.jlab.org/book/moller">
MOLLER</a></div>
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<div style="text-align: left;">Entry Makers:</div>
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<div style="text-align: left;">campero, ghoshal, dodge</div>
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<div style="text-align: left;">References:</div>
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<div style="text-align: left;"><a style="text-decoration: none;" data-auth="NotApplicable" class="OWAAutoLink" id="OWAa99dd3c9-aeb4-159f-2d71-b259032cb576" href="https://logbooks.jlab.org/entry/4458169">4458169 - TM3 to 1000A</a></div>
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<p style="margin-top: 1em; margin-bottom: 1em;">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 style="margin-top: 1em; margin-bottom: 1em;">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 style="margin-top: 1em; margin-bottom: 1em;">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 style="margin-top: 1em; margin-bottom: 1em;">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 style="margin-top: 1em; margin-bottom: 1em;">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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