The elevators in a 50 year old building were recnetly upgraded by Otis elevator to new 6-pulse scr drive units. The building is 18 stories. Whenever a new elevator is running, a singing or humming sound can be heard. We traced the source to the elevator feeder conduit that runs from the basement to the elevator penthouse, up through the freight elevator shaft. The noise seems to originate from the conduit between the 3rd and fourth floor. There are six passenger elevators on this feeder. Three have been converted to the new drives. A little experimentation confirmed that the noise only accurs during operation of one of the new drives. Also, whenever one of these new elevators starts up, there is a banging noise coming from the same conduit, between the basement and the first floor. It sounds to me like is the conductors banging around inside the conduit. The elevator company doesn't even acknowledge that there is a problem. Any thoughts??
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