David Coram Posted November 8, 2011 Share Posted November 8, 2011 Hope this breaches no rules. If anyone wants a fairly new unit, there's a good one listed for sale here. Link to comment Share on other sites More sharing options...
contrabordun Posted November 9, 2011 Share Posted November 9, 2011 Is it normal for a pipe organ action to be driven off a 3 phase supply? I'd have been surprised to find a church which had 3 phases even coming in to the building. Is it to give better smoothing than is possible with 1 phase? Link to comment Share on other sites More sharing options...
David Coram Posted November 9, 2011 Author Share Posted November 9, 2011 Is it normal for a pipe organ action to be driven off a 3 phase supply? I'd have been surprised to find a church which had 3 phases even coming in to the building. Is it to give better smoothing than is possible with 1 phase? Quite a few have 3 phase blowers and lighting. Link to comment Share on other sites More sharing options...
Tony Newnham Posted November 9, 2011 Share Posted November 9, 2011 Quite a few have 3 phase blowers and lighting. Hi Most large - and some no so large - organs are driven by a 3-phase supply, and running all 3 phases into large buildings to (theoretically) equalise the load on the phases was pretty common. Smaller organ blowers will run quite happily on single phase. I know of one church where 3-phase mains was supplied solely for the organ blower - everything else was on just one phase. That led us a song & dance trying to find why the blower wouldn't run - until I found a blown fuse in one leg of the 3 phase supply! Every Blessing Tony Link to comment Share on other sites More sharing options...
pwhodges Posted November 9, 2011 Share Posted November 9, 2011 3-phase electric motors are simpler, more compact, sometimes more efficient, and thus more reliable and cheaper to buy and run than single phase motors of comparable power. Paul Link to comment Share on other sites More sharing options...
contrabordun Posted November 9, 2011 Share Posted November 9, 2011 Thanks for that info - my only experience of 3 phase electrics has been in theatres, with (eg) 100kW on each phase, separation between (eg) FOH, Stage and Grid and lots of attention to keeping lanterns fed from the different phases more than 2m apart, so I've always associated it with very large power requirements and the need for physical separation. Link to comment Share on other sites More sharing options...
MatthewB Posted November 9, 2011 Share Posted November 9, 2011 I know a few that have 3 phase though most of these are in the london area. Called out on a job 20ish years ago, the blower wasnt working Turns out the blower was powered by a gas engine and the church hadnt paid its gas bill Matty Link to comment Share on other sites More sharing options...
ick1508 Posted November 9, 2011 Share Posted November 9, 2011 Is it normal for a pipe organ action to be driven off a 3 phase supply? I'd have been surprised to find a church which had 3 phases even coming in to the building. Is it to give better smoothing than is possible with 1 phase? The main line railway 3rd rail 750Vdc supply (south of London) is apparently derived from 3-phase using 6 diodes... Even without smoothing, the rectifier output never falls to zero; you get 6 peaks every cycle instead of 2. As demonstrated here, near the bottom of the page Some 3-phase blower motors are very old, very compact for the power rating, and very efficient! Link to comment Share on other sites More sharing options...
Janner Posted November 10, 2011 Share Posted November 10, 2011 The main line railway 3rd rail 750Vdc supply (south of London) is apparently derived from 3-phase using 6 diodes... Even without smoothing, the rectifier output never falls to zero; you get 6 peaks every cycle instead of 2. As demonstrated here, near the bottom of the page Some 3-phase blower motors are very old, very compact for the power rating, and very efficient! An excellent answer to the question. Thanks for posting that link. Link to comment Share on other sites More sharing options...
David Coram Posted November 15, 2011 Author Share Posted November 15, 2011 As this topic seemed to generate quite a few "watchers" I thought it might be worth pointing out that it ends about an hour from now at just after 2310. Link to comment Share on other sites More sharing options...
Bob Wetton Posted November 16, 2011 Share Posted November 16, 2011 Maybe just for interest. I first came to Bournemouth in 1960. Two years before three of the churches here had their blowers changed to AC. (In one case the old blower was abandoned under a vestry floor). The DC supply had come from Bournemouth Corporation Trolley Bus supply. These ran past each of the churches. A few shop lifts were also supplied. All the working Trolley Buses were, within a few years, sold to Blackpool. The massive blower for the Pavilion Compton is 3 phase 200v AC. When the voltage was altered to the 240v norm. A transformer (still in use) was supplied. Link to comment Share on other sites More sharing options...
Jonathan Lane Posted March 7, 2019 Share Posted March 7, 2019 On the subject of three phase rectifiers, can anyone supply me with a data sheet or instructions on how to change the DC output voltage on the unit attached in the photo, or manufacturer and model number if you have it. Thanks, Jonathan Link to comment Share on other sites More sharing options...
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