[Dsg-halla_ecal] test SM

Wed Apr 19 09:53:29 EDT 2023

..and I believe, Jack, that the driver you linked from Amazon does the same thing with constant 12V output but current limited via PWM.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Dsg-halla_ecal <dsg-halla_ecal-bounces at jlab.org> on behalf of Donald Jones via Dsg-halla_ecal <dsg-halla_ecal at jlab.org>
Sent: Wednesday, April 19, 2023 9:51 AM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Jack Segal <segal at jlab.org>
Subject: Re: [Dsg-halla_ecal] test SM

Hi Jack et al.,
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.
-Don
[cid:0b036a98-b3bd-4d18-99bf-6d0140ea1fdb]

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Donald Jones <jonesdc at jlab.org>
Sent: Monday, April 17, 2023 3:08 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Jack Segal <segal at jlab.org>
Subject: Re: [Dsg-halla_ecal] test SM

Hi Jack,
What do you think of this? https://www.trcelectronics.com/ecomm/pdf/hlg480h.pdf  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  $130 each<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> if you buy more than 10. Each one could drive 12 40W heaters (6 supermodules) We would probably need 40 to 50 of them.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Dsg-halla_ecal <dsg-halla_ecal-bounces at jlab.org> on behalf of Jack Segal via Dsg-halla_ecal <dsg-halla_ecal at jlab.org>
Sent: Monday, April 17, 2023 1:51 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: Re: [Dsg-halla_ecal] test SM

One other thought for driving the heaters might be an LED driver for dimmable lights. For example:
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

You can search Amazon for
0-10v dimmable led drivers

Maybe this would be more compatible with the cRIO.

On 4/14/2023 7:18 AM, Marc Mcmullen via Dsg-halla_ecal wrote:
> I’ll meet you at the test stand in physics storage.
>
> Get Outlook for iOS <https://aka.ms/o0ukef>
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> *From:* shahinya at jlab.org <shahinya at jlab.org>
> *Sent:* Thursday, April 13, 2023 8:55:37 PM
> *To:* Marc Mcmullen <mcmullen at jlab.org>
> *Cc:* Mark Jones <jones at jlab.org>; Bogdan Wojtsekhowski <bogdanw at jlab.org>; Donald Jones <jonesdc at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Patrizia Rossi <rossi at jlab.org>
> *Subject:* Re: test SM
> Hi Marc,
>
> Can we meet on Friday at 9:00 AM and discusses more detail in your plan?
>
> Thank you,
> Albert
>
>> Hi Albert,
>>
>> I’m planning on moving the controls to the physics storage on Monday.
>>
>> I’ve tested the software with the single supermodule. It controls the
>> temperature between the set points and controls ramping.
>>
>> Tomorrow I will confirm networking communications in the physics storage
>> building for the cRIO controller. I have already ran the cable, I still
>> need to reassign the cRIO to that subnet and test to make sure I can  log
>> in remotely.
>>
>> Once confirmed, I will need the test stand to be at room temperature to
>> install the Omega High Temperature
>> RTDs<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>>
>> on the supermodule front flanges and aluminum bar heater, for the
>> controls...by Monday. These RTDs are rated for 480 degrees C.
>>
>> I have attached a screen shot from the controls while I was testing at low
>> temperature with the supermodule I have in the oven.
>>
>> The software will control 4 power relays independently (Lowell RPC-20
>> picture attached) :
>>
>> 1 relay will power a group of 3 supermodules in parallel (Bank 1)
>> 1 relay will power a group of 3 supermodules in parallel (Bank 2)
>> 1 relay will power a single aluminum bar side (Al 1)
>> 1 relay will power a single aluminum bar side (Al 2)
>>
>> The software will monitor all 6 supermodules and 2 aluminum bar sides  as
>> well as the heated volume in front of the supermodules.
>>
>> I have one extra RTD to monitor either the back end of the test stand or
>> as a redundant temperature for the front heated volume area.
>>
>> The heated volume will be monitored by an independent Omega process
>> controller, I will set it to trip (and latch) all power to the heaters if
>> the temperature exceeds the Omega set point. For the single SM test stand
>> I used 400 degrees C. The Omega interlock should not be cleared until the
>> test stand has been visually verified safe...this will require someone to
>> go to the test stand to clear the latch.
>>
>> There will be a monitor and keyboard so that your group can set the
>> operating values after I train everyone, which I plan to do next week.
>>
>> All RTD temperatures will be datalogged for plotting.
>>
>> Finally, I will prepare some documentation about the system so you can add
>> the controls into your safety document.
>>
>>
>>
>>
>>
>> Regards,
>> Marc
>>
>>
>>
>>
>>
>> Get Outlook for iOS<https://aka.ms/o0ukef <https://aka.ms/o0ukef>>
>> ________________________________
>> From: shahinya at jlab.org <shahinya at jlab.org>
>> Sent: Thursday, April 13, 2023 2:00:13 PM
>> To: Marc Mcmullen <mcmullen at jlab.org>
>> Cc: Mark Jones <jones at jlab.org>; Bogdan Wojtsekhowski <bogdanw at jlab.org>;
>> Donald Jones <jonesdc at jlab.org>
>> Subject: test SM
>>
>> Hi Marc,
>>
>> Thermal tests of 6 SM were started and now the situation has stabilized.
>> If you are planning to test the control system, please let me know?
>>
>>
>> Thank you,
>> Albert
>>
>>
>
>
>
> _______________________________________________
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> Dsg-halla_ecal at jlab.org
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--
John(Jack) Segal
Halls A and C Spectrometer Support Manager
Thomas Jefferson National Accelerator Facility
12000 Jefferson Avenue
Suite 12
Newport News, VA 23606-4486
Phone: (757) 269-7242
Cell: (757) 320-9977
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