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Siemens modernizes drive system for ore mills in Chile

The modernization project includes two 8 MW SAG (semi-autogenous) mills and two 9.7 MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a different manufacturer. The standardized system design now offers all the benefits of controllable drives also for the ball mills.
When implementing this project, to prevent costly standstill periods and also to minimize risk it was vital for the new motors to fit on the foundations constructed for their predecessors. Also with a view to minimizing any risks associated with the conversion, a decision was taken to replace the entire mill automation system by modern technology rather than endeavor the laborious task of adapting the hardware and software.
The direct converter and the new automation systems were installed in ready-assembled new "E-Houses" which were completely developed, produced and pre-tested in the plant in Santiago/Chile, to be subsequently connected and commissioned on site.
The location of the mine at an altitude of over 4,200 meters meant that particular care had to be taken with the electrical and thermal dimensioning of components.

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This press release was updated on 12.07.2017 at 05:00 PM CEST.
Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for more than 165 years. The company is active in more than 200 countries, focusing on the areas of electrification, automation and digitalization. One of the world's largest producers of energy-efficient, resource-saving technologies, Siemens is a leading supplier of efficient power generation and power transmission solutions and a pioneer in infrastructure solutions as well as automation, drive and software solutions for industry. The company is also a leading provider of medical imaging equipment – such as computed tomography and magnetic resonance imaging systems – and a leader in laboratory diagnostics as well as clinical IT. In fiscal 2016, which ended on September 30, 2016, Siemens generated revenue of €79.6 billion and net income of €5.6 billion. At the end of September 2016, the company had around 351,000 employees worldwide. Further information is available on the Internet at
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Stefan Rauscher

Siemens AG

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