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Topic: Kinoton FP30D changeover
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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 06-29-2017 09:40 AM
It all depends on how things are wired up!
The DA20 (and consequently a CP650) will "look" at the motor sense lines while running Dolby digital. If only one is active, the changeover will go to the active one, regardless of where the actual changeover line is set. Now, when you make a changeover, It will see the incoming motor come on and when you make the actual changeover, will switch the sound. But if you only have one motor running, the Dolby Digital part will automatically switch to that machine.
Since it is a CP650, you also have choices in how you connected your audio changeover to it (latched or pulsed). Many Kinoton installations use a spare contact on the #2 changeover relay to latch a processor to projector #2 while the douser is open and this would explain why the processor only switches for while you are holding the button down (if the motor/failsafes are not satisfied). I've never been a big fan of this method but it is the easiest to do. We ended up making a board that would allow us to track motor start, douser open, douser close button presses to switch the changeover logic to the cinema processor. It is more work but but the end result is the cinema processor is always looking at the right machine and it will also avoid hearing run-up noises (which is why we also monitor the motor start button).
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