ABB ACS 800 User's Manual and Instructions Booklet

Success Story

New ACS 800 for ABB Electromagnetic Stirrer for Ladle Furnaces means good savings for Ovako Bar Oy Ab

ABB’s electromagnetic stirrer for its ladle furnace, The new ACS 800 was commissioned in 2006. Thanks to LF-EMS, was installed at Ovako Bar Oy Ab in Imatra in a good relationship and good cooperation between ABB and southeast Finland in 1988. Production was smooth until Ovako Imatra, the overall installation went very successfully 2005 when the old YOQD drive for the stirrer came to and start-up was on schedule. the end of its life cycle with three unexpected failures. The old YOQD frequency converter needed to be replaced Benefits with ABB’s modern ACS 800 drive due to life cycle “This case shows that Ovako Imatra does not need to buy new considerations. stirrer. Replacing the old drive with a modern one for the existing

stirrer means good savings for us”, says Jukka Kyllönen.

Summary The old drive seemed to be at the end of its life cycle simply Space savings and easy access to spare parts are two main because it is difficult to get necessary spare parts. What is advantages from a maintenance point of view according to more, it would no longer be economical to keep it in use since Ari Hirvonen, electrical maintenance engineer at Ovako Imatra. the old YOQD was an analogue drive, which means adjust- ments are difficult to make. “Since the start-up of the ACS 800 drive, no breakdowns

have been recorded”, concludes Ari Hirvonen.

“The main reason for this investment was to keep production without any interruption because all production in Ovako Imatra Cooperation goes through this stirrer. All failures in the old drives would The project was jointly executed by ABB Center of Excellence reduce or stop production if the stirrer was not in operation”, in Sweden and ABB Service in Finland. The seamless cooperation says Jukka Kyllönen, manager of electrical maintenance at within ABB paved the way for the extremely good cooperation Ovako Imatra. between ABB and Ovako Imatra.

ABB’s delivery “We are very satisfied with the good cooperation between Dismounting the old drive and installing the new ACS 800 Ovako Imatra and ABB on this project, and we expect the posed a great challenge. The transport route for the new same for the entire life cycle of the equipment”, says Jukka equipment to the electrical room was narrow and long, Kyllönen. and height was limited. As a result, the new drive had to be transported in parts.