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Author Topic: Exhaust system automation Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-15-2014 08:45 PM                     Bullo to all of you! A 75 grand a year Union operator should be making sure it's on... So there! But from the standpoint of practicality I agree with Harold's idea however, I think I'd have the sensor on the positive DC lamp feed to kick on when the lamp is lit then a timed shut off after 15 minutes. This would actually save on HVAC costs in a lot of plex's. As for the projector sensing it's own temperature. I agree thats fine and all especially snice this is 2014 and not 1969. NEC's do just that. An air flow switch is so last century these days and not completely reliable. Who kows if the last technician bypassed it because the switch failed. Switches made today have had all the nasty but necessary metals removed and generally speaking are all crap. Current sense is a great idea IMHO and quite easy to do. Mark  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 02-15-2014 10:43 PM                     Sorry Steve, meant to say yellow, not red. You obviously figured out what I meant though. And remember our NOC offers multiple levels of service beyond what is offered at the other NOCs, and not all customers want everything. However on our Active NOC, yes the lamp is automatically restruck and the alarm issued regardless so the guys at the NOC login and verify everything anyway. That doesn't change the fact Barco's SNMP is a joke and not as useful as you might think. The bobble delay would be a good solution for Christies.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-16-2014 11:21 AM                     Bobble delay went out when Ultimations hit the trash cans! That is so 1980's!  |  IP: Logged Buck Wilson Jedi Master Film Handler Posts: 894 From: St. Joseph MO, USA Registered: Sep 2010 posted 02-17-2014 12:28 AM                     "Let's turn this around into something we CAN agree on. It isn't acceptable for a show to stop just because the projector foolishly thinks marriage has been broken when nobody has even been in the booth. I'm getting real tired of seeing THAT happen. Fortunately it isn't widespread." PREACH!!! I HATE this!!!  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 02-17-2014 10:39 AM                        I built something similar to what Steve describes last summer to automate our exhaust fans at the drive-in. I've got Barco DP2K-23B's with GDC SX2000AR servers. We're using a simple automation panel built by Kimber Labs (sold by American Cinema Equipment)called the KLA-1, and using the GPIO interface from the IMB on the projector. We basically used two relays and a contactor to do the job. My GPIO automation send a pulse signal (triggered by the server) to the automation panel which in turn triggers a latching coil relay to engage the second relay. (The second relay is a "DELAY OFF" relay that has a 15 minute delay off hold time). Once triggered, the relays latch and hold the contactor energized and keep the exhaust fans running. Once the automation triggers the "EXHAUST FAN OFF" sequence, the first relay unlatches, and in turn lets the second relay begin it's 15 minute "DELAY OFF" sequence. What it does is that it keeps the exhaust fan running for 15 minutes after projector shutdown to gradually cool the bulb. I built two of these last year for my drive-in, and they work absolutely perfectly. I installed a manual override switch in mine so I can turn on the exhaust fans without the automation if needed, and I also installed a ceiling mounted indicator light that lights when the circuit is engaged so I can tell with a quick glance into the projection booth that the exhaust fans are on. I've got the "EXHAUST FAN ON" automation trigger as the very first cue in my playlist (before the bulb even lights)- so it's got time to come up to speed before the projector even starts, and the "EXHAUST FAN OFF" trigger is the last thing in the playlist at the end of the night.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-17-2014 11:54 AM                     Thats a sort of round about way to do it that does work. However, I prefer not to rely someone's home made automation but rather an off the shelf readily available UL listed item. A much easier way would be to use a Current Sense Relay This would simply be monitoring one leg of the AC going to the xenon rectifier section of any DLPee. It has a user set operating window so it would work with just about any type projector out there. It is small enough to even be built into all in one projectors if necessary. I would still use a larger motor rated contactor to switch the actual exhaust motor on and off though. Note that they also supply a version with a remote current sense transformer in case there isn't enough room inside a projector or if you just don't want the whole relay in there. CR Magnetics Spec Sheet Just about all industrial control manufactures make these types of relays in some sort of way shape or form. Seimens, Panasonic, Crouzet, etc. Mark  |  IP: Logged Christian Hove Film Handler Posts: 41 From: Aalborg, Aalborg, Denmark Registered: Jan 2012 posted 02-17-2014 02:08 PM                     Hi James, I wanted something similar on our Christie CP2220's and and as others has written the projectors (our at least) refuses to power up if the fan is not running and report an error (exhaust interlock failure as far as I remember). I do not know if your projector has the same connectors, but ours have a 3D port (DB15) that features some useful outputs. Among these there exist a +12VDC/1A supply connection for the 3D emitter. As soon as the projector is turned on, this output becomes active. I successfully use this output for driving a relay that turns on the exhaust fan. Another output is active when the projector enters 3D mode - I plan to use this for turning the 3D IR emitter for our glasses on and off. If you are interested I can post the details for wiring things up. Cheers, Christian  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-17-2014 03:07 PM                     All projectors should have a trigger signal for this built in, as closely as possible coupled to bulb running status, and with a 10min shutdown delay. - Carsten  |  IP: Logged Rick Raskin Phenomenal Film Handler Posts: 1100 From: Manassas Virginia Registered: Jan 2003 posted 02-17-2014 03:58 PM                     If these things are so mission critical why isn't there redundancy built into the exhaust system? Exactly how pervasive is the problem?  |  IP: Logged

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