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Author
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Topic: CNA200 Fire Alarm shut down
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Steffan Laugharne
Film Handler
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Posts: 15
From: Biggleswade, Beds, UK
Registered: Apr 2001
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posted 05-09-2001 01:57 PM
I've been installing Strong CNA200 automation with Dolby CP650's. In a number of multiplexes, when the fire alarm goes off (contacts that are NO become closed)and the projector shuts down. This is fine when films are running, but if any theatres are between performances with Non-Sync playing, the CP650 does not switch to mute. I have two questions; a) has anybody else encountered this and b) is there any way with inside front panel dip switches that the processor can be switched to a film sound format on fire alarm shut down(the idea being that if the projectors are stopped then no sound will be routed through the processor should one be in Non-sync mode). All the best Steff
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Steffan Laugharne
Film Handler
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Posts: 15
From: Biggleswade, Beds, UK
Registered: Apr 2001
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posted 05-10-2001 02:08 PM
Hi SteveWe've activated this function and wired accordingly on all installs, but it seems the CP650 still will not come out of non-sync. Is there a function in the CNA200 which will allow selection of a film sound format on fire alarm stop? Since the projetor stops, this will mute the sound, and if a theatre is between performances on non-sync this will also mute the sound by switching to a film format. It seems there may be a glitch in the CNA software or automation interface? Has anyone else had this particular problem? We've overcome this on screens with CP45's by linking the mute terminal on the break out board in the CNA to Mono (since the Mute fuction does not exist on this processor). Steff
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Pat Moore
Master Film Handler
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Posts: 363
Registered: Mar 2000
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posted 05-10-2001 04:13 PM
Steffan;I'm checking with our developers and will confirm, but I think what you say is correct. What might be happening is that since these systems are already in an Intermission mode, there is no film presentation to stop. I think the fire stop input is effective only if the automation is actually running a program. The normal intermission mode, such as you describe, is a state where the automation is NOT running any program, so there's literally nothing to stop. I'll post back when I get some more information. Pat
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Steve Guttag
We forgot the crackers Gromit!!!
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Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 05-11-2001 08:25 AM
Ah Stefan,I didn't read your message properly, I apologize....I missed the part where the problem is when the fire alarm goes off while in Non-Sync. If you have a master music system with distribuition amps...why not have a relay hooked to your alarm that interrupts the music feed to the DA system? This will kill it in the lobby and all theatres. Steve ------------------ "Old projectionists never die, they just changeover!"
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Steffan Laugharne
Film Handler
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Posts: 15
From: Biggleswade, Beds, UK
Registered: Apr 2001
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posted 05-19-2001 04:21 PM
Rick, This would be an option if we didn't have a CD player in each screen. This idea works well for the other chain I install and service since there is a distribution amp for non-sync. The other problem with your plan is that each CD player is fed from the same power strip as the processor and amplifiers. I wouldn't like the supply to the amps to be broken due to the fire alarm in case the supply was resumed. So I still need a solution to the shutdown problem!!!!!!! All the best chaps Steff
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