Operators of the cement production facility had clear goals for an extensive modernization project: they wanted to attain higher production rates, as well as increase availability and energy efficiency. And at the same time, the modernized plant would have to improve plant safety. Most of all, it was important that the complex project be in good hands. Thus Siemens and thyssenkrupp Industrial Solutions (TKIS) – two well-known companies in the field of industrial drive technology and power distribution – were chosen to carry out the modernization in 2017.
The Siemens equipment implemented in the project included a liquid immersed isolation transformer that uses biodegradable FR3, an environmentally friendlier alternative to mineral oil; 24-pulse Sinamics GM150 frequency converters with CSA certification; an air-cooled IP55 totally enclosed air-to-air cooler (TEAAC); a variable-speed 2000 HP Simotics induction motor for the mill; and a power distribution center (PDC) that was tested prior to installation in order to reduce the time needed for commissioning.
Breaking a US record
The new Simotics motor, which replaced the previous synchronous model, is noteworthy for a number of reasons: For starters, it is the largest UL-certified induction motor ever produced in the United States. It goes without a DC (direct current) circuit in the motor, enables rapid diagnostics and troubleshooting, and offers capability for remote support. What is more, its variable speed control allows the plant operator to directly control the grinding process by adjusting the speed accordingly. Because the motor has fewer spare and wear parts than the previous drive, it requires exceptionally little maintenance. All of this together helps increase the plant’s availability.
Thanks to good planning and the right selection of equipment, the lead time of just 32 weeks for the modernization project was kept. And right in line with the customer’s wishes, the plant has been operating more efficiently and safely, and with higher productivity and availability.