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Author
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Topic: can you change 220v 3Phase strong highlight 11 to single Phase?
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Jim Cassedy
Phenomenal Film Handler
Posts: 1661
From: San Francisco, CA
Registered: Dec 2006
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posted 12-07-2011 04:52 PM
I'm not sure about running a whole console, but I know of a couple of auditoriums here in San Francisco that are running their 3phase xenon rectifiers (Christie)off of a single phase supply by using a bank of large capacitors to generate a third "phantom" phase. This trick can be done, to some extent, with 3phase motors too, but becuase it lowers the efficiency and the torque, I've only seen it done with things like conveyor belt, blower or pump motors.
The rectifiers seem to work OK and have been using this "trick" for over 10 years now. The only thing is that it causes them to emit a loud buzz at about 120hz that I find EXTREMELY annoying. So much so that I can't stand to be in that booth for more than a few minutes when the rectifiers are turned on or I get bad headaches.
If you poke around the 'net' a bit, you'll find that there are several websites which give more details on how to calculate the type & size capacitors you'd need if you were going to attempt this. But again- I'm not sure it would be practical or even possible to run a whole console (rectifer, projector motor, automation, etc) from a 'bastard' 3ph source like this.
Best thing would be a 'real' 3phase convertor, but these can be quite expensive when you get into the larger sizes.
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