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Author
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Topic: Automation system
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Dave Macaulay
Film God
Posts: 2321
From: Toronto, Canada
Registered: Apr 2001
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posted 12-16-2018 08:07 AM
The Barco GPO gives you an optoisolator NPN transistor for the output. There is no voltage delivered, the optoisolator has a very low current rating (30mA), 70VDC maximum open circuit voltage across it, and a maximum power dissipation of 130mW (not too sure what that means as they don't specify the transistor voltage drop).
You need to provide power to activate your follower relay and ensure that you don't exceed the above ratings for the output load. Few mechanical relays that will do you any good will work with 30mA to the coil, so a solid state relay is what you want. There are SSRs with quite high load ratings, you can switch your lights and amps directly or (better) switch a power contactor relay that handles the actual load.
Server GPO is probably similar, you have to look at the documentation for your server to get the details.
As a rule I do not use projector or server GPO for anything other than the projector GPO providing a 3D sync signal. If you damage a GPO output device you have either a projector board or server board (usually the media block, most expensive part in the server) to repair if possible, probably to replace.
I recommend using a network automation device - we use Jnior from Integ but there are many alternatives - with a real mechanical relay contact output (a Jnior has them for sure) with a decent current rating (Jnior relay contact rating is 1A at max 24V AC or DC - the relays are a couple of bucks each and mounted in sockets for easy replacement if you do blow one) to control a power contactor relay.
A Jnior 410 is around $400.00, the alternatives are probably close.
Best $400.00 you can spend: you avoid the required custom interface (who builds that for less, and who do you call if/when it fails?) between your power relays and the GPO, you don't risk damaging expensive projector or server parts... plus it will almost certainly work and be very reliable.
And you have the manufacturer to call when you have questions or problems. Integ support is insanely good (Seriously. Rick is not your normal helldesk tech).
If you're handy with electronics and electrical things go ahead and put something together. Hats off to you! But if not, I say it's better to procure a professional automation interface and have a licensed electrician do the power wiring. Avoids a lot of trouble at the start, and doing electrical work yourself in a cinema incurs very serious risk: if your poor and against code wiring starts a fire with people hurt or worse there will be criminal prosecution and civil lawsuits (and your insurance will be voided).
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