[Dsg-halla_ecal] 6 supermodule test stand heater controls

[Marc Mcmullen]

Hi Don,

Brian and I have started looking into the power supplies you and Jack provided. We will update this mailing list after we complete some bench tests.

As for controls, I will be using cRIO module to control and read back from the supplies.

Marc

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________________________________
From: Donald Jones <jonesdc at jlab.org>
Sent: Thursday, May 11, 2023 5:55:27 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: [Dsg-halla_ecal] 6 supermodule test stand heater controls

Thanks, Marc.
I met with the ES&H team today and developed a path forward. They are happy that we are trying to utilize components that are UL certified and would like a list of all components and an electrical schematic the design is sufficiently mature.
It seems to me that we should move on with the next prototype as soon as possible, although the new heaters will not be in for at least weeks. If we demonstrate that we can stabilize the temperature using low voltage power supplies with active voltage control then that seems like enough information to finalize the design.
We now have ordered custom 50W at 50VDC strip heaters for the front of the supermodules and 40W at 50VDC cartridge heaters for the edge aluminum bars.
Over the next few days if you conclude that the 10A 0-48VDC LED driver power works for our application, I can order enough of them to outfit the 5 zones of the prototype. I haven't thought about the digital to analog system yet for the 0-10V control voltage, but you likely have a better idea about what works well with LabVIEW although most vendors provide LabVIEW drivers these days. I would say we will need something like 40 channels.
-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 Marc Mcmullen via Dsg-halla_ecal <dsg-halla_ecal at jlab.org>
Sent: Thursday, May 11, 2023 5:15 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: [Dsg-halla_ecal] 6 supermodule test stand heater controls

Hi Bogdan, Albert, and Don,

I have completed functionality testing for the controls of the test stand. All instrumentation and software are working properly.

I am attaching plots from the testing today. One file has all 5 plots arranged according to their respective heater channel position on the test stand, the others are the individual heater channel plots. Each plot has temperatures in the top portion and the relay/power action on the bottom. Also I plotted the Omega temperature with the supermodule plots only, as the Omega tends to crowd the plot of the bottom temperature sensor of the aluminum bar heaters.

 Initially, I ramped up the left aluminum bar heaters to 50C. After that, I ramped up all channels to 50C, then up to 100C. Due to the ambient temperature, the aluminum bars struggled to get up to 100C. This should be different after the test stand is enclosed. I ramped the supermodules down to 80C and the aluminum bars down to 75C.

Note: the plots have a period of time that I turned off the datalogger to make an adjust the code, there is a gap in the data for all channels (labeled "No Data").

Finally, I tested the over-temperature interlock by setting the Omega set point to 70C and increasing the set point on the supermodules to 100C. The interlock tripped all control power to the relay modules and the temperature dropped. I visually verified the temperature on the Omega drop to 64C (well below the interlock set point of 70C) to ensure the interlock latch function is working properly. It worked as programmed. I cleared the latch and all relays started providing power to the heaters.

All channels have been set to 0C. It should be at room temperature in a few hours.

Regards,
Marc


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