Meantime I modified my changes to account for what's said in: viewtopic.php?f=60&t=80501.PeeBee wrote: ↑Mon Jun 26, 2017 1:02 pm... And it is undergoing a major change: A "Reserve HLT" that manages the HLT! It will allow me to heat portions of the HLT liquor "offline" so it will rapidly increase the temperature of the HLT (which feeds a HERMS) when returned to it. I grew impatient with the RIMS stuff and consider the other solution (a mini-HERMS for faster response) a dead loss.
Finally! I get around to it. So with the new "supporting" vessel built I need to patch in that vessel's control box into the existing ones. My control boxes are based on the documented "Electric Brewery" adapted for UK electrics and making the safety start interlock compulsory, not an option. I also split the heavy switching to its own "distribution" control box, and all the hands-on controls to a low amp (<6A) and low voltage (12V) in it's own control box.
I'm posting this because it might help others, give folk ideas and to give anyone the option to disagree with me (which I might argue with!).
So: Let's patch in the new control box to the existing distribution control box. This will be awkward because the distribution box is not easily accessible, under a bench, and hasn't been opened since I built it. But it was built when I was far more "incapacitated" than I am now so it shouldn't be too complicated …
… Holy Moses!
Not as bad as it looks(!) Because I couldn't have the picture hanging about nagging me to finish the job, so the jobs finished in the piccie. You can see the big 40A contactors in the bottom right, and one of the three (switching the 2KW RIMS element) has been replaced with 2x20A contactors (the new vessel has a 3KW element and won't be used for extended periods). There is also the 24 core patch cable adding to the spaghetti of wires.
Next job, wire up the new control box ...