[Dsg-halla_ecal] electronics + control diagram

[Marc Mcmullen]

The fuse block idea sounds like a good one.
________________________________
From: Donald Jones <jonesdc at jlab.org>
Sent: Monday, October 16, 2023 2:54 PM
To: Marc Mcmullen <mcmullen at jlab.org>; Brian Eng <beng at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: Re: electronics + control diagram

Hi Marc,
I had considered current overload to be sufficiently taken care of by the unit which has built-in protections for overcurrent(auto-restart upon removal of overcurrent condition), overvoltage (requires restart) and overtemperature (requires restart). There is further protection provided by the AC mains connections which have 20A breakers. Two power supplies will be plugged into a single 20A breaker at 120VAC. Each power supply typically uses 7A but during startup can surge well above that. We have used 20A breaker bars during testing and have not found them to trip at load, so I expect this load to be fine.
In principle I could swap out simple terminal blocks in the diagram with fused ones like this, for example, if there is sufficient concern.
https://www.amazon.com/Holder-Indicator-Suitable-Automotive-Weiruixin/dp/B07BF2V57M/ref=asc_df_B07BF2V57M/?tag=hyprod-20&linkCode=df0&hvadid=241914879076&hvpos=&hvnetw=g&hvrand=18099710846840941978&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9008569&hvtargid=pla-439266685155&th=1
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Monday, October 16, 2023 2:29 PM
To: Brian Eng <beng at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Donald Jones <jonesdc at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Subject: Re: electronics + control diagram

Don,

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.

Marc
________________________________
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: Monday, October 16, 2023 2:24 PM
To: Brian Eng <beng at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Donald Jones <jonesdc at jlab.org>
Subject: Re: [Dsg-halla_ecal] electronics + control diagram

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.
________________________________
From: Brian Eng <beng at jlab.org>
Sent: Monday, October 16, 2023 2:19 PM
To: Marc Mcmullen <mcmullen at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Donald Jones <jonesdc at jlab.org>
Subject: Re: electronics + control diagram

Is the power supply output current something that you are expecting to keep in the full system?

See slide 3 (the yellow wires to the analog input) from this talk Marc previously gave: https://www.jlab.org/sites/default/files/dsg/talks/hall-a/ECAL%20Heater%20Controls%20and%20Instrumentation_post.pdf

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.

________________________________
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: Monday, October 16, 2023 2:10 PM
To: Marc Mcmullen <mcmullen at jlab.org>; dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: Re: [Dsg-halla_ecal] electronics + control diagram

Sorry about that, here it is.


Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
________________________________
From: Marc Mcmullen <mcmullen at jlab.org>
Sent: Monday, October 16, 2023 2:09 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>; Donald Jones <jonesdc at jlab.org>
Subject: Re: electronics + control diagram

Hi Don,

There is no attachment.

Marc
________________________________
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: Monday, October 16, 2023 1:40 PM
To: dsg-halla_ecal at jlab.org <dsg-halla_ecal at jlab.org>
Subject: [Dsg-halla_ecal] electronics + control diagram

Hi Marc and Brian,
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?
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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