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<a href="https://logbooks.jlab.org/entry/4328186" rel="bookmark">Follow-up Re: Follow-up Re: Follow-up Re: Follow-up Re: Hall B Solenoid and Torus Cooldown </a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4328186" class="lognumber" data-lognumber="4328186">4328186</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2025-01-25T12:26:19-0500" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1737822379&end_date=1737829579&book=HBLOG&book=HBSOLENOID&book=HBTORUS&book=CLOG">Sat, 01/25/2025 - 12:26</a></time>. </p>
<table class="field-vitals">
<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a> <a href="https://logbooks.jlab.org/book/hbsolenoid">HBSOLENOID</a> <a href="https://logbooks.jlab.org/book/hbtorus">HBTORUS</a> <a href="https://logbooks.jlab.org/book/clog">CLOG</a></td></tr>
<tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/4328027">4328027 - Follow-up Re: Follow-up Re: Follow-up Re: Hall B Solenoid and Torus Cooldown </a></td></tr>
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<div class="logentry node-content">
<p>Last night EV8111CD stopped responding to requested changes in both manual and normal (PID) mode.<br />
I switched flow control to PV8512T for the overnight at 7g/s and this worked well.<br />
at 09:00 we had a teams meeting with Probir, Brian, Pablo, Denny, Sandesh.<br />
We discussed possibilities and plans to address the problem.<br />
4 of us came into the lab and went to Hall B.<br />
The first thing we tried worked.</p>
<p>It was to disconnect the drive cable clean the connector with alcohol and an air canister to dry it. slide the connector on and off a few times then lock it on and that solved the problem.</p>
<p>This failure mode has happened twice in past month in Hall B. I highly recommend that whenever one can each group put their EV's in manual mode, disconnect the drive cable, do a cleaning process and reconnect. This should be on a scheduled maintenance program once every 1-4 years....<br />
Hall B especially!</p>
<p>Other notes<br />
The torus was full filled by 02:07 this morning, 14 hrs after starting the flow.<br />
The solenoid is at 65K and cooling at 1.2K/hr</p>
<p>Hall B is taking 7g/s with the flow once again being controlled by EV86111CD</p>
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