Video and 3 Phase Power

D

Dave Barker

Freshman
Jan 15, 2011
45
0
6
Charlotte, NC
www.dbsoundcharlotte.com
I am working on a installed project that will have 108 video panels used to create a video wall. We are looking to provide 100 amp 3 phase power to the wall. The question has come up as to whether or not having the panels on different phase of service and being what 120 degrees out of phase would cause any problems when reproducing a single image on this large screen. I am not a video guy or big power guy so I thought I would ask here.

Thanks
 
Re: Video and 3 Phase Power

I can't speak regarding specific models of LED panels, but it's done every day on tour. Typically VDO request to be on power transformers that are not used for lighting and will share with audio if necessary.

Since the VDO signals are not locked to AC line freq or voltage, I don't see how being on multiple phase legs of AC service would affect the image.

Have fun, good luck.

Tim Mc
 
Re: Video and 3 Phase Power

Tim McCulloch said:
Since the VDO signals are not locked to AC line freq or voltage, I don't see how being on multiple phase legs of AC service would affect the image.
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I think that is the issue, when dealing with video sources that lock to line frequency rather than a separate sync signal and that don't allow phase adjustment, it is necessary to have them all on one phase. Thus people have gotten into the habit of assuming that all video always has to be on a single phase.
 
Re: Video and 3 Phase Power

Brad Weber said:
I think that is the issue, when dealing with video sources that lock to line frequency rather than a separate sync signal and that don't allow phase adjustment, it is necessary to have them all on one phase. Thus people have gotten into the habit of assuming that all video always has to be on a single phase.
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Those days are long gone. Any pro video application is going to be genlocked to it's own sync generators whether internal or external. AC power isn't even in the equation. Ground loops are the real concern and those aren't related to having your gear on separate phases.

Greg
 
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