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» Film-Tech Forum   » Operations   » Ground Level   » Harry Potter and the Projector on Fire

   
Author Topic: Harry Potter and the Projector on Fire
Ron Keillor
Expert Film Handler

Posts: 166
From: Vancouver, B.C. Canada
Registered: Jul 2003


 - posted 11-19-2005 01:52 AM      Profile for Ron Keillor   Email Ron Keillor   Send New Private Message       Edit/Delete Post 
Dunbar Vancouver midnite show of Harry Potter* was interrupted at /about 0230 when there was a projector malfunction and the film was seen to burn on screen. This was fortunately after the climax of the film, but full refunds were issued. There had been local TV coverage for the screening,so it made this evening's news. The only inside captures of the event were on cellphones.

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Matt Fields
Jedi Master Film Handler

Posts: 539
From: Jackson, Ohio, United States
Registered: Jun 2005


 - posted 11-19-2005 07:59 AM      Profile for Matt Fields   Email Matt Fields   Send New Private Message       Edit/Delete Post 
Brainwrap

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Steve Scott
Phenomenal Film Handler

Posts: 1300
From: Minneapolis, MN
Registered: Sep 2000


 - posted 11-19-2005 01:42 PM      Profile for Steve Scott   Email Steve Scott   Send New Private Message       Edit/Delete Post 
Same thing reportedly happened at the nearby Apple Valley Carmike during the midnight screening of EP3. 500-some passes issued. We did a 9 screen interlock at Lakeville with no problems [thumbsup]

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Phil Blake
Jedi Master Film Handler

Posts: 558
From: esperance western australia
Registered: Nov 2003


 - posted 11-27-2005 03:40 AM      Profile for Phil Blake   Author's Homepage   Email Phil Blake   Send New Private Message       Edit/Delete Post 
We often experience the odd "film Burn" situation here.

Our local power supply is very "up an down" and when the slightest power fluctuation happens the projector motors stop but the dowser and zippers remain open and the lamp continues to burn . The panalogic seems to not detect that the motors stop and everything gets smokey until we manually shut them down.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12155
From: Annapolis, MD
Registered: Dec 1999


 - posted 11-27-2005 08:24 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
The Panalogic and other automations with DC power are not going to "see" power fluctuations the way AC automations are due to the filtration in the power supply. It will take longer for it to die down.

The motors on your projectors...are they "pulse" or "latched". If latched, I would be surprised that the motor is dropping out since the automation has control over that...if it is latched, then yes, the automtion would not be aware of the problem.

There are many ways to attack the problem...including setting up a self latching relay on the automations such that if power dies...the automations lose power until it is reset.

However, I think other alterntatives exist....you could use the lamphouse sense line with a relay across the projector motor to interrupt the lamphouse signal such that if the motor is not running, the automation sees a lamphouse fault and shuts the show down. Even if you are not using the lamphouse sensor, you could use the relay on that A/D converter input for a motor sense.

If you have pulsed motor logic, like Kinoton, then convert to latched is another potentially easy solution (for Kinoton, no new parts or wiring are needed).

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Louis Bornwasser
Film God

Posts: 4428
From: prospect ky usa
Registered: Mar 2005


 - posted 11-27-2005 10:06 AM      Profile for Louis Bornwasser   Author's Homepage   Email Louis Bornwasser   Send New Private Message       Edit/Delete Post 
I am surprised that the automation in use does not have a speed sensor to eliminate this kind of thing. It is required equipment on many non-US installations, such as all of the old Cinemation units. Louis

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Pete Naples
Phenomenal Film Handler

Posts: 1544
From: Dunfermline, Scotland
Registered: Feb 2001


 - posted 11-30-2005 06:48 AM      Profile for Pete Naples   Email Pete Naples   Send New Private Message       Edit/Delete Post 
Indeed, in parts of the UK, where ACOP regulations are in force, the equipment must shut down if the projector runs under speed.

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Phil Blake
Jedi Master Film Handler

Posts: 558
From: esperance western australia
Registered: Nov 2003


 - posted 12-11-2005 02:29 AM      Profile for Phil Blake   Author's Homepage   Email Phil Blake   Send New Private Message       Edit/Delete Post 
Iam not certain how the motors are connected , but they can be started by switch on consol or by "motor on" softkey on the panalogic. , projectors have film sensors which will not allow the automationto start the projector if it has no film , so i imagine the automation has some control over the motrs , just nothing to "see" if the motors stop running.
I am wondering if all these brushless motors stop straight away when the main voltage drops suddenly.

and yes we do have lamp sensors in the xenons.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16160
From: Bountiful, Utah
Registered: Jun 99


 - posted 12-15-2005 05:03 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
Speed sensors aside it would also be very easy to incorporate a power line sensor to shut the c/o and projector down. Similar to how a UPS senses the incomming power.

Mark

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