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Author
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Topic: ORC single phase xenon PSU problem
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Luciano Brigite
Master Film Handler
![](http://www.film-tech.com/ubbmembers/1104b.jpg)
Posts: 277
From: Sao Paulo, SP, Brazil
Registered: Jan 2002
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posted 10-01-2003 07:22 PM
Hello, I have an ORC xenon power supply that went down on me this weekend, it's one of their single phase psu ,I found the schematic on the manuals section, page 74 of 82 of the orconII console . It's pretty much what I have here except for a few details: This power supply was somewhat modified ( de-assmebled and re-assembled inside a wood box, the terminal strip for current control is gone and in it's place a rotary switch was placed, also the booster circuit is modified, compared to the schematic I mentioned, the reistor pos. r1 (100ohm,50W) has a light bulb in it's place but seems to work allright and allows you to see the insides of this thing when the xenon bulb is on.. Now comes the deal.. the schematic says that there are 3 kinds of transformes and 2 current coils ( the L1 in the schematic) -1 for 115V, -3for 208/230 - 50A and -5 for 208/230 65A . for xformers and -1 115v -3 208V for L1 . this one has -3C marked on the xformer , the coding on the coil couldn't be seen. I'm assuming it's -3. This psu is being run at 220V ,switch at mid position ,wich would be the tap 3 on the coil ( don't know if the wiring on the coil was messed up or not since it has spate terminals on the winding for the wires) the xformer has only 2 connections for primary, 2 for the boost circuit and the secondary and the numbering doesn't match at all the ones in the schematic. The problem with it is that setting the tap at any of the fist 5 positions will keep the bulb current at about 40A, give or take a few and wen advanced to the last tap on the coil it'll go over 100A and everything inside it will hum very loud and go hot in a few minutes. I checked everything i'd think that could be giving trouble but find nothing, I'm suspecting that the L1 is shorted somewhere inside it between the taps 5 and 6 or the coil and transformer aren't for 220V. From the schematic I believe its a psu for a 1.600W xenon at max. and it was being used to power a 2.000W bulb on a theatre Doesn anyone has any idea about the ratings for this -3C (full code is 1144416-3C)transformer and what could be causing this current jump? Can the L1 coil be replaced by a electronic power control? ( I'm aware that a triac based control can generate noise in the lines but with a proper filter at the input it shouldn'b be a problem..) One last note. while testing it ( using a 2.000W bulb) before the diodes went poof on me, the bulb strikes on the first try ( if cold) and will keep lit for 10~15 minutes then starts flickering and goes off, from there, re-strike becomes a nightmare .replacing the diodes didn't refresh anything. I suggested a new ( and proper) PSU but they want to keep this "firebox" as I called right at the first look ...
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