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Don,</div>
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Have you consider over-current protection for the heater supply channels? Maybe fuse each line at 15 to 20 A. The supplies are limited to 12.5 and they have built-in overprotection...but fuses are very effective.<br>
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Marc<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Dsg-halla_ecal <dsg-halla_ecal-bounces@jlab.org> on behalf of Marc Mcmullen via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Monday, October 16, 2023 2:24 PM<br>
<b>To:</b> Brian Eng <beng@jlab.org>; dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Donald Jones <jonesdc@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_ecal] electronics + control diagram</font>
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The intention would be to combine the power supply disconnect, and relay box with current readback into one chassis. There is currently a box with a barrier block which extends the heater power cables so the relay box can be inside the bunker.<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Brian Eng <beng@jlab.org><br>
<b>Sent:</b> Monday, October 16, 2023 2:19 PM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Donald Jones <jonesdc@jlab.org><br>
<b>Subject:</b> Re: electronics + control diagram</font>
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Is the power supply output current something that you are expecting to keep in the full system?</div>
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See slide 3 (the yellow wires to the analog input) from this talk Marc previously gave: <a href="https://www.jlab.org/sites/default/files/dsg/talks/hall-a/ECAL%20Heater%20Controls%20and%20Instrumentation_post.pdf" id="OWAa8032fa2-494f-c6ff-98ee-4a5e59cc99cd" class="x_x_OWAAutoLink">https://www.jlab.org/sites/default/files/dsg/talks/hall-a/ECAL%20Heater%20Controls%20and%20Instrumentation_post.pdf</a></div>
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Currently there are three separate enclosures/boxes (that house the distribution, current monitoring, and relays). The intention is for all of those to be combined into a single box.</div>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt; color:rgb(0,0,0)"><b>From:</b> Dsg-halla_ecal <dsg-halla_ecal-bounces@jlab.org> on behalf of Donald Jones via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Monday, October 16, 2023 2:10 PM<br>
<b>To:</b> Marc Mcmullen <mcmullen@jlab.org>; dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_ecal] electronics + control diagram</font>
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<span class="x_x_x_smartReply">Sorry about that, here it is.</span></div>
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Donald Jones</div>
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Hall A/C Staff Scientist</div>
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Jefferson Lab</div>
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Newport News, VA</div>
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<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt; color:rgb(0,0,0)"><b>From:</b> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Monday, October 16, 2023 2:09 PM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Donald Jones <jonesdc@jlab.org><br>
<b>Subject:</b> Re: electronics + control diagram</font>
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Hi Don,</div>
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There is no attachment.</div>
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Marc<br>
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<div id="x_x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt; color:rgb(0,0,0)"><b>From:</b> Dsg-halla_ecal <dsg-halla_ecal-bounces@jlab.org> on behalf of Donald Jones via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Monday, October 16, 2023 1:40 PM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org><br>
<b>Subject:</b> [Dsg-halla_ecal] electronics + control diagram</font>
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Hi Marc and Brian,</div>
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I have attached a diagram of the electronics for the power and control of the ECal heater system. I would like to submit it to Electrical Safety for comments/approval. To your knowledge is this accurate and sufficiently complete?</div>
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-Don</div>
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Donald Jones</div>
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Hall A/C Staff Scientist</div>
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Jefferson Lab</div>
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Newport News, VA</div>
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