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<p>Attached is 2 myaPlot charts of the trip today at 4:33.<br
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</p>
<div>Sequence of events as seen by the hardware interlock system:<br
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<div><br>
1) 4:26:25 - Cooling temperature starts rising.<br
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</div>
<div>2) 4:32:59 - Cooling pressure starts dropping.<br
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</div>
<div>3) 4:33:00 - Cooling in-flow starts dropping.<br
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</div>
4) 4:33:06 - Cooling in flow drops to .5L/m - Interlock limit=.5,
cool in-flow status = 1 (Fault).<br>
5) 4:33:08 - After the 2 sec delay (current delay setting) - Cooling
in-flow latched error.<br>
<br>
Hardware interlock operated correctly during this event.<br>
<br>
<div class="moz-forward-container">In this trip, cooling temperature
started rising first, otherwise the sequence is the same.<br>
<br>
-------- Forwarded Message --------
<table class="moz-email-headers-table" cellspacing="0"
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
</th>
<td>[dsg-svt] SVT Cooling System Trip Analysis (Hardware
Interlock)</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Thu, 9 Aug 2018 13:30:58 -0400</td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Peter Bonneau <a class="moz-txt-link-rfc2396E" href="mailto:bonneau@jlab.org"><bonneau@jlab.org></a></td>
</tr>
<tr>
<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td>dsg-svt <a class="moz-txt-link-rfc2396E" href="mailto:dsg-svt@jlab.org"><dsg-svt@jlab.org></a></td>
</tr>
</tbody>
</table>
<br>
<br>
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<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000">
<div>Attached is a myaPlot chart of the trip today at 9:17:09.<br
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</div>
<div>Sequence of events as seen by the hardware interlock
system:<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>1) 9:17:01 - Cooling pressure starts dropping.<br
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</div>
<div>2) 9:17:03 - Cooling in-flow starts dropping.<br
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</div>
<div>3) 9:17:07 - Cooling in flow drops to .5L/m - Interlock
limit=.5, cool in-flow status = 1 (Fault).<br>
4) 9:17:09 - After the 2 sec delay (current delay setting) -
Cooling in-flow latched error.<br>
Hardware interlock operating correctly during this event.<br>
<br>
I saw the same for the trip yesterday.<br>
<br>
We could increase the trip delay time for troubleshooting.<br
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</div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Yuri Gotra" <a
class="moz-txt-link-rfc2396E" href="mailto:gotra@jlab.org"
moz-do-not-send="true"><gotra@jlab.org></a><br>
<b>To: </b>"Peter Bonneau" <a class="moz-txt-link-rfc2396E"
href="mailto:bonneau@jlab.org" moz-do-not-send="true"><bonneau@jlab.org></a>,
"dsg-svt" <a class="moz-txt-link-rfc2396E"
href="mailto:dsg-svt@jlab.org" moz-do-not-send="true"><dsg-svt@jlab.org></a><br>
<b>Sent: </b>Thursday, August 9, 2018 8:53:51 AM<br>
<b>Subject: </b>Re: [dsg-svt] SVT HFCB temp R3S1T/B<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">
<p>These readings have been unstable or failing completely for
the past months. I asked Brian to look into it. He fixed the
issue several times when there was direct wire connection to
the patch panel blocks. Now there are connectors but the
problem is still there.<br>
</p>
<p>There is also a failing reading Humidity SB3.</p>
<p>Yesterday there were 2 SVT trips. I disabled the coolant
pressure interlock in the evening, no trips overnight.
Enabled it again. A log with interlock trip time stamps
would be very helpful to debug the trips.<br>
</p>
<br>
<div class="moz-cite-prefix">On 8/9/18 8:20 AM, Peter Bonneau
wrote:<br>
</div>
<blockquote
cite="mid:1186611071.35759659.1533817252362.JavaMail.zimbra@jlab.org">
<div style="font-family: arial,helvetica,sans-serif;
font-size: 12pt; color: #000000"
data-mce-style="font-family: arial,helvetica,sans-serif;
font-size: 12pt; color: #000000;">
<div>R3S1T & R3S1B temperature sensor readings are
unstable and has increased over the last hour from
nominal (~-4.9C) to 25 - 30C. <br>
</div>
<div>Low voltage/current readback for R3S1T/B is normal.</div>
<div>All other HFCB temperatures are normal.<br>
</div>
</div>
<br>
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