24 Jun
2007
24 Jun
'07
2:18 p.m.
On Sun, 2007-06-24 at 16:15 -0400, William Donzelli wrote:
I used to fit microwave links onto the tops of tall multi-storey
buildings. The lift controllers I saw tended to run from a small rack
the size of a MicroVAX 3300, up to several wardrobe-size racks full of
relays.
Gordon
That's
an interesting idea. How physically massive is such a
system likely to be?
As Patrick pointed out, they vary - complexity and age are the variables.
On the last day of RCS/RI in the old mill, we finally managed to get
into the old elevator control shack. It looked like it was from 1930
or so. Basically, a panel the size of a house door controlled a simple
four floor, mostly-automatic, non-motorized-door, freight elevator. Of
course, the relays were not the little ice cubes we are familar with,
but really rather large open frame things. Serious overkill on soze,
but not as bad as the railroad relays.