The customer called for a more compact controller, improved presentation of alarms and results and an excellent cost/benefits ratio. That’s were Freelance with AC 700F came into play.
Replacement of a PLC with AC 700F for impoved presentation of alarms
Northam Platinum Ltd. is based in Johannesburg, South Africa, and mines and produces precious metals. Convertors are used to extract platinum from ore. These convertors are driven using electrical motors. Until now, a PLC controlled the motors’ direct motor starters. This operating mode was not reliable and efficient enough for Northam, as the motors thus operate constantly at full output. That reduces the lifespan of the components and causes higher repair and maintenance costs to increase.
When the application was modernized and converted to frequency converters to increase energy efficiency, the outdated PLCs were to be replaced. Customer requirements were a more compact controller, an improved presentation of alarms and results and an excellent cost/benefits ratio.
Northam opted for the new AC 700F controller when replacing PLCs for the converters. Northam has been using the Freelance system to control its smelting furnaces and other applications for many years and is convinced by the system's performance.
Easy adjustment of the motor output allows up to 50% of energy savings
One AC 700F controller now regulates one variable-speed drive. The motor output can be adjusted at any time to the current operating requirements of the application, as frequency converters can be simply driven by the controller. The adjustment allows up to 50% of energy savings and processes can be better controlled.
The increase in efficiency resulting from the intelligent speed control can be used in two ways: to increase productivity or to keep production stable while simultaneously reducing energy consumption.