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Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
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Posts: 627
radiotech, are you familair with general electric SCR very well? I have a few stud SCRs, GE C37D, and I cannot find datasheets anywhere on this part, do you happen to know of a source for finding old datasheets?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The GE 37D is a 400 volt 25 amp TO 48 package- data is in the condensed specifications on page 431 of the 4th edition manual (1967) and that is the only place I saw it.
Things vanish from data manuals. Also this is a non-jedec number.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Thanks for the dwg. I thought a capacitor was used somewhere in the gate circuit..
btw I am in the old location with portable computer, looking at stuff, etc. Here are some views of some cells that are here: 150 amp 600 volt; the white thing in one view is a 250 amp fuse
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
well, it can be like here:
however, I do not need this circuit, since I only want 90 degree control, so the first one should do. in the schematic ive posted, the diode prevents negative voltage, and if you move the pot "down" the resistance is at its highest, and the SCR will not fire until the peak of the AC cycle, and if the pot is moved in its oposite direction, it will trigger at the beginning of the half-cycle. (well, at least between the 0 and 90 degree)
some very nice equipment you have, what machine did that come from?
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
A paper machine drive made around 1966 was replaced with a modern digital controlled SCR drive around 1995 or so. Those working on the project were granted permission to remove parts since the old drive was scrapped. All the machinery remained the same except the tachometers were replaced with resolvers.
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old parts?
