[Dsg-halla_ecal] electronics + control diagram

[Marc Mcmullen]

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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