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Author Topic: Omnex rectifier question David Rigby Expert Film Handler Posts: 134 From: Chorlton, Manchester, UK Registered: May 2002 posted 04-24-2005 11:46 AM                     Anyone have an electronic copy of the tapping diagram for this thing - or alternatively can anyone tell me the apping setting for a 900W lamp (I assume this needs to be 55A or so)? Thanks David  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 04-24-2005 12:25 PM                     55A is a bit high for a 900W lamp; 45A would be more like it.  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 04-24-2005 01:20 PM                        Hi David I hope this helps You should have (I think) the red wire on 0 and the brown on perhaps 1 Cheers OMNEX RECTIFIER Wire 1 0 Low tappings Wire 2 1 40A 1A 40A 2 45A 3 50A 4 55A 4A 55A 5 60A Wire 1 6 HIGH TAPPINGS Wire 2 1 55A 1A 60A 2 65A 3 70A 4 76A 4A 80A  |  IP: Logged David Rigby Expert Film Handler Posts: 134 From: Chorlton, Manchester, UK Registered: May 2002 posted 04-25-2005 04:02 AM                     Thanks very much guys. I agree about 55 seeming a bit high BTW - 45 was my original intention but I was then advised by someone else that 55 was more like it. Seemed a bit high to me too. 45 it is! That's exactrly the info I needed Peter - thanks...my bit of paper with the tappings on went walkies it seems. David  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 04-25-2005 06:06 AM                        Hi again David - A word of warning - these rectifiers are not bad but they need 10 mins to settle down - set the current and strike the lamp and wait ! Otherwise it waits till you have the last screw on till it changes ..  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 04-25-2005 03:10 PM                     Peter that's usually a sign that the capacitors are going soft. Like any high-reactance type power supply they do need a short time to stabilise (probably to do with the bulb and the transformer warming up), but it shouldn't need anything like 10 minutes, 2-3 is right. The circuitry is very similar to the single phase Orcon rectifier (was it FXPS?, at any rate the one found in the bottom of Optimax consoles, and similar to that found in CFS consoles), and very similar to the single phase unit now made by Strong.  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 04-26-2005 10:36 AM                        Hi Pete Good to hear that you are alive ! Granted, I quite like the OMNEX rectifiers - with the demise of T and R they are the only decent single phase option other than switchers. We have found current fluctuations even from new however this is not a real problem - more so the number of bloody screws and the flimsy case that you need to deal with to adjust these. How's Scotland ? I await some public body anouncing the conversion of all cinemas there to Digital, of course in a new proprietary format incompatible with Ireland, the UK and Hollywood..  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 04-26-2005 10:59 AM                     The case is a constant bone of contemption, never ceases to amaze me how it manages to distort when it's inanimate on the floor! S'funny, it's all gone quiet in Ireland, I'm back across there in a couple of weeks, was asking how the conversions were going, expecting to arrive in a land of DLPs... The tech manager of the site I'm heading to just laughed...  |  IP: Logged Kevin Orman Film Handler Posts: 24 From: Sompting, Lancing, UK Registered: Mar 2005 posted 04-26-2005 12:03 PM                     Hi guys! Well, it always seems to take about half an hour before the final operating current is reached - it always drops once the lamp and/or power supply is warm. We have found this to apply with both switched-mode power supplies and also to our T&R rectifier. Seems to drop much more with the electronic one though meaning that if you want to end up with a 'warm' operating current of say 60amps then this will need to run at 65-68 amps on a cold lamp. Are the OMNEX ones made on a similar pattern to the old T&R's or completely different design?  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 04-26-2005 05:45 PM                     Completely different design Kevin, the T & R uses some kind of moving core in the transformer to control the current, similar to the 3 phase IREM. The single phase Omnex rectifier id designed and manufactured by ourselves, although the circuitry is very similar, but not identical, to the Orcon/Strong/CFS. It uses a multi tapped transformer, you select whichever tap to give you the current you require. We recomend using them to power up to 1600w bulbs, but in reality you can probably power a 2kW at 75 amps.  |  IP: Logged

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