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This topic comprises 2 pages: 1 2
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Author
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Topic: Troubles with Christie's rectifiers
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Giorgio Volpi
Film Handler
Posts: 51
From: Caracas - Venezuela
Registered: Mar 2002
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posted 03-18-2002 05:13 PM
Hi guys,
this is my first forum message.
I have worked with many projectors: Pio Pion, Fedi, Cinemeccanica, Microtecnica, Prevost, Century, Simplex and finally Christie.
I have to admit that Christie is the worst thing that could happen in my life (professionally speaking).
The Christie projectors have been showing troubles about dousers (all of them), shutter belts, lens turret and gate electric systems (P35), intermittent blocks and ball bearings.
Now I am working with 15 Christie projectors (8 P35 and 7 M35), some of which have presented a peculiar problem.
There are some projectors with 2000W console that every 800-1000 hours of operation the lamp stops to light on.
A new one substitutes the lamp and it works perfectly.
I place the old lamp in another lamphouse (Kneisley, this time) and it works perfectly.
This only happen in one theatre (less than 1 year open); 7 projectors, 3 of 3KW and 4 of 2KW, and the problem is only presented by the 2KW projectors.
Other 8 projectors in other 2 theatres: 4 of 3KW and 4 of 2KW don't present this problem.
I have revised the whole installation, components and connections: everything seems to be in order.
Can somebody help me to discover where the midget hides? ---+++---+++---+++---+++---
Have a good projection ....
Giorgio.
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 03-18-2002 05:26 PM
Giorgio,Are you using Christie lamps? When you say they stop lighting, have you tried pressing the manual ignite button? What I am trying to determine is if it is a lamp problem, or an igniter problem or perhaps just mix of the two. When they ignite, how long is the delay from when the contactor pulls in vs when the lamp tries to ignite. On Christie's it should be just about 1 second. If it is taking longer than you may need to adjust your igniter so it senses the boost voltage better. Not knowing your incoming mains voltage and how your rectifiers are tapped, It is a bit hard to diagnose. Steve ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 03-18-2002 08:37 PM
The Christie igniter has a bi-metal deal that will stop the igniter from burning up if it tries to strike too many times. Inside the igniter, (you will have to remove a red cover) there is a power resistor with a tap-ring on it. This ring sets the voltage at which the igniter starts to work. Moving it VERY slightly, you should be able to taylor the ignition pulse to work with your situation. I have often had to sweeten it up based on a particular bulb brand and theatre situation. FWIW, Christie recitifers normally only put out just over 100VDC on no load...they may make it up to about 120VDC after several seconds but that is about it.Another thing to check is the 4th tap on the rectifier...it sets the boost. All four taps should be in the same position. Since it is the 2KW system, they should all be set to the "high" position. My guess though, your problem can be solved in the igniter. Steve ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 03-18-2002 11:27 PM
Rick,Nope, the Christie does not have a thermal switch on it's rectifier. Furthermore, the complaint was that the system would give up trying to ignite after several tries. If it was a thermal sensor, then it would drop the arc after it had heated up. Steve ------------------
"Old projectionists never die, they just changeover!"
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Giorgio Volpi
Film Handler
Posts: 51
From: Caracas - Venezuela
Registered: Mar 2002
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posted 03-19-2002 04:21 PM
Thanks to all of you.Steve, I worked with the resistor but the problem could been solved in only one rectifier during 2 or 3 days. Gordon, I tried with manual (long) pulse and the lamp didn't turn on. Richard, thanks for your philosophic help .... BTW the Kneisley is workink with a low no load voltage, about 85VDC, and starts very well. I'd like to remember to all of you that this problem happens only at this theatre (El Recreo) and only with 2KW rectifiers. Giorgio.
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