my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Can IREM N3-X75 be used for 2500W bulb

Author Topic: Can IREM N3-X75 be used for 2500W bulb Marin Zorica Jedi Master Film Handler Posts: 671 From: Biograd na Moru, Croatia Registered: May 2003 posted 01-03-2009 08:30 AM                     I have one X75 from irem, I hear the rectifier can be used for 85A (2500W) bulb without problems, only to change diodes and put some higher than are inside now, also I was think to add two fan at bot on so they can suck air inside to cool it better. Any experiences in doing this?  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 01-03-2009 09:27 AM                        I would probably agree to try this using 60 Hz current. HOWEVER, these run much hotter on 50 Hz than on 60 Hz. For that reason, I would be concerned about the health of the transformers themselves. Remember the n3x75 is only rated at 1600 watts in Europe/2000 watts in the USA. Bulb ratings:(Max) 70 amps 1600 watt 80 amps 2000 watt 95 amps 2500 watts Of course you should actually figure the watts using the volts times amps formula. Louis  |  IP: Logged Marin Zorica Jedi Master Film Handler Posts: 671 From: Biograd na Moru, Croatia Registered: May 2003 posted 01-03-2009 09:40 AM                     It's actually rated as 4 KVA rectifier, so I think it would be possible, one thing more is that this is changeover booth, so it won't be operate as is for plex or whole show.  |  IP: Logged John Hawkinson Film God Posts: 2273 From: Cambridge, MA, USA Registered: Feb 2002 posted 01-03-2009 10:19 AM                     I'd think you want a fan on top, not the bottom. A fan on our two IREM P1-X80s makes a huge difference in its temperature, but it's probably being overdriven at 2 kW. --jhawk  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 01-03-2009 11:23 AM                     Even though the design of the N3-X75, in a vertical position, with disperse heat like a chimney; I have in many situations, cut holes on one of the side panels to mount (3) 220V 50Hz muffin fans cooling each transformer stack, with enough air flow to help the diode heatsink.....I would power them up via the 220V terminals on the Irem connection panels.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-03-2009 12:30 PM                     Yes, it should work ok especially considering that you more ethen likely have 50HZ 380 volt 3 phase which is what the windings on these older IREM's were usually wound for... Many of these rectifiers will barely light a lamp when run off of 208 volt three phase unless you install a booster circuit. I also second Richards idea of adding fans to the unit... they are way under heat sinked anyway. Mark  |  IP: Logged Marin Zorica Jedi Master Film Handler Posts: 671 From: Biograd na Moru, Croatia Registered: May 2003 posted 01-03-2009 01:39 PM                     quote: Mark Gulbrandsen Yes, it should work ok especially considering that you more ethen likely have 50HZ 380 volt 3 phase which is what the windings on these older IREM's were usually wound for... Many of these rectifiers will barely light a lamp when run off of 208 volt three phase unless you install a booster circuit. I also second Richards idea of adding fans to the unit... they are way under heat sinked anyway. Yea it's 380V/50Hz and I run it on that voltage, normal for Europe But I was think also good thing would be to replace diodes with stronger one, they don't coast much but it will be safer.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-03-2009 02:25 PM                     Yes, Semikron makes a large but still size compatable diode that is actually shipped in all new IREM's. It's available in either english thread or metric. I highly reccomend that diode... SKR something er other I think... the exact number escapes me at the moment... I still also second the fans. Edit: Check this one out... Big Honkin Semikron Diode Mark  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.