[Dsg-halla_ecal] emergency shutdown for ECal

[Donald Jones]

Hi Marc,
I am trying to think through how we (you) will be able to implement the over-temperature shutdown on the ECal heater system. I think you said that the LED driver supplies, replace the relays. My understanding was that you were planning to use an Omega process controller to shut off the relays in the event of an over-temp condition. Did I understand correctly and do we need to re-introduce them? Here is the layout of the electrical system as planned which has no emergency shutoff relay. We could in principle, connect the 120 VAC plugs into relays that are powered by the AC mains.
-Don
[cid:2f54876a-4459-4239-85da-b81d4eb44dce]
-Don

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