Many theatres only have failsafes that detect presence anyway. Since this is going to be an attended projector I don't think you'll have any problems to begin with. If, by chance, something did go wrong you'd still be there to catch the problem. The failsafe is only giving you that "extra margin" of safety.

If I remember my specs correctly the "flicker" caused by the sprocket holes going by the sensor is what the detector "sees" to sense film motion. As far as I know, the "rate" of flicker that the thing wants to see is hard-wired into the device. I suppose Bill Purdy or one of his guys will have to answer this question in detail.

Just think, back in the "old days" most projectors didn't even have falsifes! The only reason they are there is because most states have some kind of law that says they have to be there if the projector is not attended 100% of the time. This is basically an outgrowth of "platter technology" which allowed people to start the machine and just walk away.

1) You don't make mistakes... that's why you are a member of Film-Tech, right?
2) Your booth is attended 100% of the time. (Or at least 99.5%)
3) You still have presence detection.

Leo,
I am a little surprised that it is dropping out at the 20 frame rate. It is supposed to work to down around 12 or 14. This, however, is determined with a simple R/C time constant and is therefore subject to variations. So, I have two thoughts for you. First, look at your sensor assembly and note if there is a red dot on it, and if there is, look up at the bottom of it and see if there is an eight pin IC package. Then look at the support roller. It should have "Vee" shaped grooves below the scanning areas If all this is so, then you have the latest version. If not, you may want to consider the upgrade which is much more stable and forgiving. We sell these directly to the end users for US$56.00 and there is a $15.00 refund if you return the old assembly.

Possible fix number two requires the change of one resistance value. We have a drawing for this and I shall e-mail it to you in JPEG format.

Please don't hesitate to contact us if you have any other problems.

We do have the grooved support rollers.

I've now experimented with the other projector (the silent we ran last week was not an archive print and fitted onto a single 6,000ft spool, so only mech was needed) and found that it will detect motion correctly right down to 16fps (the slowest our inverters go).

So I guess it must be a time constant issue with that one machine.

Incidentally, the projectors are Cinemeccanica Vic 5s.

 |  IP: Logged