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the frequency of this PWM is 21 kHz according to Wikipedia</div>
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<div>-- <br>
George Jacobs<br>
<span style="font-family:"Times New Roman",Times,serif">Jefferson Lab (TJNAF)</span><br>
<span style="font-family:"Times New Roman",Times,serif">STE 12</span><br>
<span style="font-family:"Times New Roman",Times,serif">12000 Jefferson Ave.</span><br>
<span style="font-family:"Times New Roman",Times,serif">Newport News, VA 23606</span><br>
<span style="font-family:"Times New Roman",Times,serif">(office) 757-269-7021</span><br>
<span style="font-family:"Times New Roman",Times,serif">(email) jacobsg@jlab.org</span></div>
<div><span style="font-family:"Times New Roman",Times,serif">(url) https://userweb.jlab.org/~jacobsg<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 Donald Jones via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Wednesday, April 19, 2023 9:51 AM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Jack Segal <segal@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_ecal] test SM</font>
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Hi Jack et al.,</div>
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After looking at this a little more I realized that dimmable LED power supplies are not really adjustable voltage supplies. The dimming is accomplished by pulse width modulation, essentially turning the current on and off with varying duty cycle to control
the current while keeping voltage constant. I'm not sure what the switching frequency is, but if it's slow, then it's essentially the same as Marc's relay controls. I took a screenshot of the explanation of PWM (pulse width modulation) from the LEDsupply.com
website below. The particular version I chose has adjustable voltage from 45 to 51V with built in manual potentiometer and then adjusts the current via PWM.</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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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Donald Jones <jonesdc@jlab.org><br>
<b>Sent:</b> Monday, April 17, 2023 3:08 PM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Jack Segal <segal@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_ecal] test SM</font>
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Hi Jack,</div>
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What do you think of this? <a href="https://www.trcelectronics.com/ecomm/pdf/hlg480h.pdf" id="LPlnk804472">https://www.trcelectronics.com/ecomm/pdf/hlg480h.pdf</a> in particular the HLG-480H-48 that provides dimmable voltage up to 48VDC and 10A (7yr warrantee
with expected lifetime of 62000 hrs). They are only <a href="https://www.trcelectronics.com/View/Mean-Well/HLG-480H-48.shtml?utm_term=&utm_campaign=Shopping+Display&utm_source=adwords&utm_medium=ppc&hsa_acc=9805199880&hsa_cam=164782104&hsa_grp=11827142184&hsa_ad=41002365624&hsa_src=g&hsa_tgt=pla-1658905909587&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gclid=CjwKCAjw3POhBhBQEiwAqTCuBqiAMO4El6vHTetuURaMe2UNde8e3FzW2iC5uwIOVTCRrYd8aqRXkxoCknkQAvD_BwE" title="https://www.trcelectronics.com/View/Mean-Well/HLG-480H-48.shtml?utm_term=&utm_campaign=Shopping+Display&utm_source=adwords&utm_medium=ppc&hsa_acc=9805199880&hsa_cam=164782104&hsa_grp=11827142184&hsa_ad=41002365624&hsa_src=g&hsa_tgt=pla-1658905909587&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gclid=CjwKCAjw3POhBhBQEiwAqTCuBqiAMO4El6vHTetuURaMe2UNde8e3FzW2iC5uwIOVTCRrYd8aqRXkxoCknkQAvD_BwE" id="LPlnk865514">$130
each</a> if you buy more than 10. Each one could drive 12 40W heaters (6 supermodules) We would probably need 40 to 50 of them. </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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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Dsg-halla_ecal <dsg-halla_ecal-bounces@jlab.org> on behalf of Jack Segal via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Monday, April 17, 2023 1:51 PM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org><br>
<b>Subject:</b> Re: [Dsg-halla_ecal] test SM</font>
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<div class="x_x_PlainText">One other thought for driving the heaters might be an LED driver for dimmable lights. For example:<br>
<a href="https://www.amazon.com/Constant-120-277VAC-Channels-Dimmable-Aluminum/dp/B0B8WN97CC/ref=sr_1_8?crid=3UPVJS4F25U05&keywords=0-10v%2Bdimmable%2Bled%2Bdrivers&qid=1681753510&sprefix=0-10v%2Bdimmable%2Bled%2Bdrivers%2Caps%2C64&sr=8-8&th=1">https://www.amazon.com/Constant-120-277VAC-Channels-Dimmable-Aluminum/dp/B0B8WN97CC/ref=sr_1_8?crid=3UPVJS4F25U05&keywords=0-10v%2Bdimmable%2Bled%2Bdrivers&qid=1681753510&sprefix=0-10v%2Bdimmable%2Bled%2Bdrivers%2Caps%2C64&sr=8-8&th=1</a><br>
<br>
You can search Amazon for<br>
0-10v dimmable led drivers<br>
<br>
Maybe this would be more compatible with the cRIO.<br>
<br>
On 4/14/2023 7:18 AM, Marc Mcmullen via Dsg-halla_ecal wrote:<br>
> I’ll meet you at the test stand in physics storage.<br>
> <br>
> Get Outlook for iOS <<a href="https://aka.ms/o0ukef">https://aka.ms/o0ukef</a>><br>
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br>
> *From:* shahinya@jlab.org <shahinya@jlab.org><br>
> *Sent:* Thursday, April 13, 2023 8:55:37 PM<br>
> *To:* Marc Mcmullen <mcmullen@jlab.org><br>
> *Cc:* Mark Jones <jones@jlab.org>; Bogdan Wojtsekhowski <bogdanw@jlab.org>; Donald Jones <jonesdc@jlab.org>; dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; Patrizia Rossi <rossi@jlab.org><br>
> *Subject:* Re: test SM<br>
> Hi Marc,<br>
> <br>
> Can we meet on Friday at 9:00 AM and discusses more detail in your plan?<br>
> <br>
> Thank you,<br>
> Albert<br>
> <br>
>> Hi Albert,<br>
>><br>
>> I’m planning on moving the controls to the physics storage on Monday.<br>
>><br>
>> I’ve tested the software with the single supermodule. It controls the<br>
>> temperature between the set points and controls ramping.<br>
>><br>
>> Tomorrow I will confirm networking communications in the physics storage<br>
>> building for the cRIO controller. I have already ran the cable, I still<br>
>> need to reassign the cRIO to that subnet and test to make sure I can log<br>
>> in remotely.<br>
>><br>
>> Once confirmed, I will need the test stand to be at room temperature to<br>
>> install the Omega High Temperature<br>
>> RTDs<<a href=""></a>https://assets.omega.com/pdf/test-and-measurement-equipment/temperature/sensors/rtds/RTD-2-F3102.pdf <<a href="https://assets.omega.com/pdf/test-and-measurement-equipment/temperature/sensors/rtds/RTD-2-F3102.pdf">https://assets.omega.com/pdf/test-and-measurement-equipment/temperature/sensors/rtds/RTD-2-F3102.pdf</a>>><br>
>> on the supermodule front flanges and aluminum bar heater, for the<br>
>> controls...by Monday. These RTDs are rated for 480 degrees C.<br>
>><br>
>> I have attached a screen shot from the controls while I was testing at low<br>
>> temperature with the supermodule I have in the oven.<br>
>><br>
>> The software will control 4 power relays independently (Lowell RPC-20<br>
>> picture attached) :<br>
>><br>
>> 1 relay will power a group of 3 supermodules in parallel (Bank 1)<br>
>> 1 relay will power a group of 3 supermodules in parallel (Bank 2)<br>
>> 1 relay will power a single aluminum bar side (Al 1)<br>
>> 1 relay will power a single aluminum bar side (Al 2)<br>
>><br>
>> The software will monitor all 6 supermodules and 2 aluminum bar sides as<br>
>> well as the heated volume in front of the supermodules.<br>
>><br>
>> I have one extra RTD to monitor either the back end of the test stand or<br>
>> as a redundant temperature for the front heated volume area.<br>
>><br>
>> The heated volume will be monitored by an independent Omega process<br>
>> controller, I will set it to trip (and latch) all power to the heaters if<br>
>> the temperature exceeds the Omega set point. For the single SM test stand<br>
>> I used 400 degrees C. The Omega interlock should not be cleared until the<br>
>> test stand has been visually verified safe...this will require someone to<br>
>> go to the test stand to clear the latch.<br>
>><br>
>> There will be a monitor and keyboard so that your group can set the<br>
>> operating values after I train everyone, which I plan to do next week.<br>
>><br>
>> All RTD temperatures will be datalogged for plotting.<br>
>><br>
>> Finally, I will prepare some documentation about the system so you can add<br>
>> the controls into your safety document.<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> Regards,<br>
>> Marc<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> Get Outlook for iOS<<a href=""></a>https://aka.ms/o0ukef <<a href="https://aka.ms/o0ukef">https://aka.ms/o0ukef</a>>><br>
>> ________________________________<br>
>> From: shahinya@jlab.org <shahinya@jlab.org><br>
>> Sent: Thursday, April 13, 2023 2:00:13 PM<br>
>> To: Marc Mcmullen <mcmullen@jlab.org><br>
>> Cc: Mark Jones <jones@jlab.org>; Bogdan Wojtsekhowski <bogdanw@jlab.org>;<br>
>> Donald Jones <jonesdc@jlab.org><br>
>> Subject: test SM<br>
>><br>
>> Hi Marc,<br>
>><br>
>> Thermal tests of 6 SM were started and now the situation has stabilized.<br>
>> If you are planning to test the control system, please let me know?<br>
>><br>
>><br>
>> Thank you,<br>
>> Albert<br>
>><br>
>><br>
> <br>
> <br>
> <br>
> _______________________________________________<br>
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<br>
-- <br>
John(Jack) Segal<br>
Halls A and C Spectrometer Support Manager<br>
Thomas Jefferson National Accelerator Facility<br>
12000 Jefferson Avenue<br>
Suite 12<br>
Newport News, VA 23606-4486<br>
Phone: (757) 269-7242<br>
Cell: (757) 320-9977<br>
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