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Author
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Topic: Unsteady light output (fluctuations) Osram 1kW - V5 - CX16H - IREM X50DM
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Sverrir D. Thorarinsson
Film Handler
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Posts: 13
From: Selfoss, Iceland
Registered: Sep 2005
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posted 07-13-2007 04:58 PM
Hello, I'm experiencing unsteady light output in one of two auditoriums. On screen it looks like the light is floating on the screen. The light output is also low. The bulb glass is quite smoked but the lamp has still 500hours left. It's running at 55Amp (according to the ammeter on the lamphouse). Ventilation looks alright, I measured no more than 35-40°C in the lamphouse itself. (outside temperature is 19°C)
I have two things that might help: 1. The heat in the projection booth is very high, my readings show 31°C. The heat in the lamphouse is low but all other things on the projector and other equipments are very hot. Figures: The projector wall (treading path) is 54°C Film gate is 60°C Lenses are 55°C Lamphouse walls are between 41-56°C Rectifier walls are between 45-52°C
2. A 1600W lamp was once running on the rectifier but he is only designed to produce 30-50A (according to the info on it), resluting failure, I don't know what failed in it but isn't it possible that something else has gone bad because of the too large lamp?
The bulb has never been rotated and there is no arc stabilization. (the projector is tilted very little)
I would also like to note that this is not a cinema I work for, I'm only working here for 3days because of staff issues, but I would like to solve this issue because I know,no one else will.
Equipments: Cinemeccanica Victoria5 with CX16H lamphouse IREM 3phase rectifier type N3-X50DM Lamp: Osram XBO 1000W/HSC OFR (rated lamp A: 50Amp, range: 30-55Amp, lamp life: 2000hours)
Isn't the fluctation caused by unstable arc burning? I think it's not caused by the rectifier because that would describe it self as regular flicker or something like that.
All help is very much appreciated.
Best regards, Sverrir D. Thorarinsson Iceland
Update: I measured the exhaust from the projector and it's 55°C, I guess it's acceptable, but the anode/cathode glow quite bright after shut down. -More than in the cinemas I work usually for. [ 07-13-2007, 07:00 PM: Message edited by: Sverrir D. Thorarinsson ]
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