ABB’s complete scope of supply included two dual pinion low-speed mill drive systems for a 34-foot 2 x 5.2 MW semiautogenous (SAG) mill and a 24-foot 2 x 7 MW ball mill, engineering and commissioning. The drive systems are comprised of transformers, ACS 6000 MV frequency converters, synchronous motors, advanced mill control, operations and maintenance features inherent to the ABB RMD solution.
Features include variable-speed operation, real time frozen charge protection, frozen charge remover function, controlled roll-back and positioning without a need for an additional inching drive. ABB also delivered the programmable logic controller (PLC) to control the mill auxiliaries.
ABB’s RMD solution is currently in operation with more than 55 mills worldwide, attesting to the reliability of this grinding technology.