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<p>Amrit,</p>
<p>I concur with this assessment. If there is a scheduled
maintenance involving controlled gas supplies, DSG should be
informed so that the appropriate measures can be applied prior to
an outage. In addition to your MFC accounting I would like to add
that there is only one spare cRIO for the gas system.</p>
<p>We will look into adding an alarm based on the value of the MFC
initialization, this would provide an alert if the MFC software is
stopped due to a communications failure between the cRIO and any
of the associated MFCs.<br>
</p>
<p>Thanks,</p>
<p>Marc<br>
</p>
<div class="moz-cite-prefix">On 3/14/2018 4:09 PM, Amrit Yegneswaran
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1695038639.3269358.1521058186088.JavaMail.zimbra@jlab.org">
<div style="font-family: tahoma,new york,times,serif; font-size:
14pt; color: #009900">
<div>marc with regards to your e-mail, here are some
clarifications.<br>
</div>
<ol style="list-style-type: undefined;">
<li>@ 0801 hrs SVT MFCs on the space frame were disconnected
by Hall B engineering, which is why the cRIO on the space
frame hung up.</li>
<li>@ ~1030 hrs gotra noted the gas wasn't flowing to the SVT
and contacted peter.<br data-mce-bogus="1">
</li>
<li>tyler, pablo, amanda, marc restored the cRIO at ~1100 hrs.<br
data-mce-bogus="1">
</li>
<li>so, the MVT was without gas for ~3 hours.<br
data-mce-bogus="1">
</li>
</ol>
<div><span style="color: rgb(255, 0, 0);" data-mce-style="color:
#ff0000;">Recommendations:</span><br data-mce-bogus="1">
</div>
<ol style="list-style-type: undefined;">
<li><span style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">Hall B detector managers
should be informed and should inform their counterparts
via the mailing lists prior to any work on <em>any
component</em> of the the gas system, so that t
appropriate measures can be taken to ensure the safety of
the detector. </span><span style="color: rgb(0, 0,
255);" data-mce-style="color: #0000ff;"><br
data-mce-bogus="1">
</span></li>
<li><span style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;">MVT and HTCC <em>should
invest</em> in owning their own cRIO system, so that all
systems are independent, see table.</span><span
style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;"><br data-mce-bogus="1">
</span></li>
</ol>
<div><span style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;"><span style="color: rgb(0, 0, 255);"
data-mce-style="color: #0000ff;"></span></span>
<table style="width: 90%; table-layout: fixed;"
cellpadding="3px" border="1px">
<tbody>
<tr>
<td><span style="font-size: 12pt; color: rgb(255, 0,
0);" data-mce-style="font-size: 12pt; color:
#ff0000;">cRIO location</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(255, 0,
0);" data-mce-style="font-size: 12pt; color:
#ff0000;">Systems</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(255, 0,
0);" data-mce-style="font-size: 12pt; color:
#ff0000;">#of MFCs </span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(255, 0,
0);" data-mce-style="font-size: 12pt; color:
#ff0000;">Available spares</span><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">SVT</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">1 to 3 </span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">0</span><br>
</td>
</tr>
<tr>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">Space Frame</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">MVT</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">5</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">3</span><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">HTCC</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">1</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">0</span><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
</tr>
<tr>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">Forward Carriage</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">LTCC</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">4</span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">2</span><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
</tr>
<tr>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">Gas Shed </span><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">DC mixing system</span><br>
</td>
<td><span style="color: rgb(0, 0, 255); font-size:
12pt;" data-mce-style="color: #0000ff; font-size:
12pt;">4</span><br>
</td>
<td><span style="color: rgb(0, 0, 255); font-size:
12pt;" data-mce-style="color: #0000ff; font-size:
12pt;">1</span><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><span style="font-size: 12pt; color: rgb(0, 0,
255);" data-mce-style="font-size: 12pt; color:
#0000ff;">DC supplies</span><br>
</td>
<td><span style="color: rgb(0, 0, 255); font-size:
12pt;" data-mce-style="color: #0000ff; font-size:
12pt;">3</span><br>
</td>
<td><br>
</td>
</tr>
<tr>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
<td><br>
</td>
</tr>
</tbody>
</table>
</div>
<div><span style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;"><br data-mce-bogus="1">
</span></div>
<div><span style="color: rgb(0, 0, 255);" data-mce-style="color:
#0000ff;"><br data-mce-bogus="1">
</span></div>
<div><br>
</div>
<hr id="zwchr" data-marker="__DIVIDER__">
<div data-marker="__HEADERS__"><b>From: </b>"Marc Mcmullen"
<a class="moz-txt-link-rfc2396E" href="mailto:mcmullen@jlab.org"><mcmullen@jlab.org></a><br>
<b>To: </b>"Maxime Defurne" <a class="moz-txt-link-rfc2396E" href="mailto:mdefurne@jlab.org"><mdefurne@jlab.org></a>,
<a class="moz-txt-link-abbreviated" href="mailto:dsg-mvt@jlab.org">dsg-mvt@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:dsg-hallbgas@jlab.org">dsg-hallbgas@jlab.org</a><br>
<b>Cc: </b>"Bob Miller" <a class="moz-txt-link-rfc2396E" href="mailto:rmiller@jlab.org"><rmiller@jlab.org></a><br>
<b>Sent: </b>Wednesday, March 14, 2018 12:46:45 PM<br>
<b>Subject: </b>Re: [Dsg-mvt] MVT mass flow controller set
points<br>
</div>
<div><br>
</div>
<div data-marker="__QUOTED_TEXT__">Maxime,<br>
<br>
I am passing this information to the Hall B Gas community.
Some work was <br>
done to some of the mass flow controllers which are on the
same cRIO as <br>
the MVT. The gas system has been designed with a fix for mfc
related <br>
issues, so during some circumstances someone who is on-call
may be <br>
required to reboot one of the cRIOs, to reset the mfc
software.<br>
<br>
Additional training needs to be conducted if this is a
potential problem <br>
for the MVT. I will bring this up during our meeting, please
talk with <br>
Bob and Stepan so this information is known to all.<br>
<br>
-Marc<br>
<br>
<br>
On 3/14/2018 12:32 PM, mdefurne wrote:<br>
> Hi Marc,<br>
><br>
> Everything is fine (Mixture ratio and flow).<br>
><br>
> But next time, please tell us before rebooting the cRIO
so that we do <br>
> not take any risk (HV was on and if something would not
have been good <br>
> with the gas for any reason, it would have been a
disaster). I got a <br>
> bit scared when I read your e mail :P<br>
><br>
> Cheers,<br>
><br>
> Maxime<br>
><br>
><br>
> Le 14/03/2018 à 12:24, Marc McMullen a écrit :<br>
>> Hi Maxime,<br>
>><br>
>> We had to reboot the cRIO which controls all the mfc
for the space <br>
>> frame, including the mixing system for mvt. Please
check your set <br>
>> points, and manual/automatic settings to ensure you
are getting the <br>
>> desired flow.<br>
>><br>
>><br>
><br>
> _______________________________________________<br>
> Dsg-mvt mailing list<br>
> <a class="moz-txt-link-abbreviated" href="mailto:Dsg-mvt@jlab.org">Dsg-mvt@jlab.org</a><br>
> <a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/dsg-mvt">https://mailman.jlab.org/mailman/listinfo/dsg-mvt</a><br>
<br>
-- <br>
Marc McMullen<br>
Detector Support Group<br>
757-269-7738<br>
<br>
_______________________________________________<br>
Dsg-mvt mailing list<br>
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<br>
<pre class="moz-signature" cols="72">--
Marc McMullen
Detector Support Group
757-269-7738</pre>
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