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Thanks Eugene,</div>
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Any time that you can suggest, morning or afternoon?<br>
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Let me explore and see the availability of Brain and Nick.</div>
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Regards</div>
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<br>
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probir<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Eugene Pasyuk <pasyuk@jlab.org><br>
<b>Sent:</b> Monday, August 10, 2020 10:15 AM<br>
<b>To:</b> Probir Ghoshal <ghoshal@jlab.org>; Nicholas Sandoval <sandoval@jlab.org>; Brian Eng <beng@jlab.org>; dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Cc:</b> Ruben Fair <rfair@jlab.org>; Stephen Bueltmann <bueltman@jlab.org><br>
<b>Subject:</b> Re: MPS Comm Alarm</font>
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<p class="x_MsoNormal">Good morning,</p>
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<p class="x_MsoNormal">There will be a maintenance day tomorrow and no beam to us. We could ramp magnets down to safely apply those patches to the magnet controls.</p>
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<p class="x_MsoNormal"><span style="color:black">-Eugene</span></p>
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<p class="x_MsoNormal"><b><span style="font-size:12.0pt; color:black">From: </span>
</b><span style="font-size:12.0pt; color:black">Probir Ghoshal <ghoshal@jlab.org><br>
<b>Date: </b>Friday, August 7, 2020 at 1:57 PM<br>
<b>To: </b>Eugene Pasyuk <pasyuk@jlab.org>, Nicholas Sandoval <sandoval@jlab.org>, Brian Eng <beng@jlab.org>, dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Cc: </b>Ruben Fair <rfair@jlab.org><br>
<b>Subject: </b>Re: MPS Comm Alarm</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Excellent..!</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Regards</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; color:black">Probir</span></p>
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<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Eugene Pasyuk <pasyuk@jlab.org><br>
<b>Sent:</b> Friday, August 7, 2020 1:51 PM<br>
<b>To:</b> Probir Ghoshal <ghoshal@jlab.org>; Nicholas Sandoval <sandoval@jlab.org>; Brian Eng <beng@jlab.org>; dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Cc:</b> Ruben Fair <rfair@jlab.org><br>
<b>Subject:</b> Re: MPS Comm Alarm</span> </p>
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<p class="x_xmsonormal">I see on the accelerator white board a maintenance day coming Tuesday on day shift. It could be an opportunity to ramp magnets down and apply those fixes.
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<p class="x_xmsonormal">I’ll let you know if it happens or not. I guess we will know Monday morning.</p>
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<p class="x_xmsonormal"><span style="color:black">-Eugene</span></p>
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<p class="x_xmsonormal"><b><span style="font-size:12.0pt; color:black">From: </span>
</b><span style="font-size:12.0pt; color:black">Probir Ghoshal <ghoshal@jlab.org><br>
<b>Date: </b>Friday, August 7, 2020 at 1:27 PM<br>
<b>To: </b>Nicholas Sandoval <sandoval@jlab.org>, Brian Eng <beng@jlab.org>, dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Cc: </b>Eugene Pasyuk <pasyuk@jlab.org>, Ruben Fair <rfair@jlab.org><br>
<b>Subject: </b>Re: MPS Comm Alarm</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Brian, Nick,</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">So how long will this take to carryout the work as suggested?</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Eugene - will there be a window/an opportunity to work on when the magnets are at 0 A?</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Please let us know and we can plan out if that is going to be quick (Brian and Nick to suggest)</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Regards</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Probir</span></p>
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<p class="x_xmsonormal"><b><span style="color:black">From:</span></b><span style="color:black"> Dsg-hallb_magnets <dsg-hallb_magnets-bounces@jlab.org> on behalf of Nicholas Sandoval <sandoval@jlab.org><br>
<b>Sent:</b> Friday, August 7, 2020 12:32 PM<br>
<b>To:</b> Brian Eng <beng@jlab.org>; dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Subject:</b> Re: [Dsg-hallb_magnets] MPS Comm Alarm</span> </p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Hi Brian,</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Thanks for this. Yes it is definitely important to reset the MPS comms as soon as possible. If the system tries to initiate a controlled ramp down while communication is lost the PLC will
notice it is not progressing as it should and would initiate the MPS ramp down. Once initiated we cannot recover until back to 0 amps again.</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">having looked at the MPS comm reset it is in the 'initialize' sub routine that we reset the current setpoint to 0 amps, we can easily comment out this portion at the next opportunity.
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">-Nick</span></p>
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<p class="x_xmsonormal"><b><span style="color:black">From:</span></b><span style="color:black"> Dsg-hallb_magnets <dsg-hallb_magnets-bounces@jlab.org> on behalf of Brian Eng <beng@jlab.org><br>
<b>Sent:</b> Friday, August 7, 2020 11:25 AM<br>
<b>To:</b> dsg-hallb magnets <dsg-hallb_magnets@jlab.org><br>
<b>Subject:</b> [Dsg-hallb_magnets] MPS Comm Alarm</span> </p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">Figured I'd post to the mailing list and get input rather than posting to the entries themselves; regarding the logentries related to this: <a href="https://logbooks.jlab.org/entry/3821968">https://logbooks.jlab.org/entry/3821968</a></span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">If this particular alarm comes up again it probably would it be better to reset it as soon as possible?</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">While nothing is in danger we end up losing most of the software controls when the PLC can't talk with the power supply. Instead it's mostly hardware protection, fortunately during the last
long break a lot of faults got moved to a slow dump in hardware, but best to not let it get that far.</span></p>
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<p class="x_xmsonormal"><span style="font-size:12.0pt; color:black">The only reason I'd hesitate to make that the SOP is that is as Eugene noted it started to ramp down after resetting, which isn't very surprising. Any suggestions?</span></p>
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