[Dsg-halla_ecal] electronics schematic for ECal heaters

[Donald Jones]

Hi Folks,
I built a preliminary visual electronics schematic for the ECal heater system. Electrical safety wants something like this before giving us the go ahead to build the detector. It has a different schematic for the cartridge heaters and the strip heaters to illustrate that the cartridge heaters each are wired individually with wires extending outside the enclosure, whereas for the strip heaters a single wire from outside feeds the entire zone with jumpers between heaters to wire them in parallel. This simpler configuration is possible because the strip heaters have terminal connectors which makes it easy to install the jumper cables. However, it does require a heavier gauge wire because 1 wire is pulling the full 12.5A.
I show the diagrams below. Please comment on changes needed.
Marc, can you tell me how you plan to implement a temperature safety relay into a system like this with 42 individual power supplies with regular 120VAC plugs?

-Don


[cid:dbfbc85c-0724-4a8b-9a3b-d40acc961b75]
[cid:95dab0f2-1997-40ea-8424-af1863beb9f7]

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