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Topic: Problem with Strong Power Supply
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
![](http://www.film-tech.com/ubbmembers/145d.jpg)
Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 10-07-2002 01:01 AM
OK here is the situation:I have a Strong reactance power supply model 78001-1 that is running a 3000W bulb in a Super 80 lamphouse. About two months or so ago, the lamp would kick in and out in a relatively fixed pattern (run for about 5 min, kick off, kick back on after about 2-3- min, etc.) I narrowed it down to the thermal sensor on the rectifier stack. I replaced the sensor with a spare I had in a parts box, and things were back to normal. Well, today it began to do the exact same thing again. I currently have the sensor jumpered to keep them on screen, and there have been no reports of anything else abnormal happening since then (no overheating, etc). Bulb (Christie CXL30R) is running at approximately 27VDC/100A. Cooling fan is working properly and the airflow is not restricted. I have noticed that the heat sink plates on the rectifier stack are pretty hot to the touch (too hot to touch for more than a fraction of a second) shortly after the unit shuts down. [yes, I cut the 3-phase to it before sticking my hands in it] I know they probably do run hot, but is this 'too' hot? I plan on calling Strong about this in the morning, but figured I would give you all a shot at it first ![](http://www.film-tech.com/ubb/smile.gif) -Aaron
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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 10-07-2002 07:47 AM
I, for one, have always disapproved of running 3KW lamps on DO-5 diodes (85A max)...they do get damn hot. Is your rectifier one of the current ones (FXPS)? I believe they are using much higher current diodes on all of the rectifier sizes. BTW, the thermal sensor may have been defective as well (the one you put on)...check it's rating and use a thermal sensor to see what it really is running. Steve ------------------ "Old projectionists never die, they just changeover!"
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Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!
![](http://www.film-tech.com/ubbmembers/145d.jpg)
Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999
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posted 10-07-2002 06:06 PM
>>You didn't mention the model number of the power supply in question.<<I didn't have that handy when I posted. It is a model 78001-1 reactance power supply. Changing the heat sensor yet again failed to correct the problem. -Aaron
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