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Variable speed drive eliminates grinder stoppages

Regular stoppages of a grinder used in the production of animal feed have been eliminated with the installation of an ABB variable speed drive (VSD) to control the input of ingredients.

The VSD regulates the speed of a screw conveyor to ensure the grinding mill is not overloaded with raw material. The system has also increased the amount of soft ingredients the grinder is able to process, improving productivity.

Burniston Mill in Scarborough, UK produces animal feed by grinding grains such as wheat and barley. These are then pelletised to form the finished product.

The original installation employed a vibrating table which fed the grain into the grinding mill. However, because of its age the table was unreliable and often over-fed the mill. The motor had to work harder, resulting in current overloads that tripped the motor and stopped production.

Steve Barker, mill manager at Burniston Mill, asked electrical systems specialist MP Electric to provide an alternative method for feeding the grinder. Working with ABB authorised value provider Halcyon Drives, a solution was developed using a 2.2 kW ABB machinery drive to control the speed of the motor driving a screw conveyor. The new system monitors the current drawn by the grinding mill motor and adjusts the speed of the screw conveyor to ensure the mill motor is not overloaded.

This also ensures that hard grains are not fed into the grinder too quickly, whereas soft grains can be fed in at a higher rate. This has improved productivity by increasing the amount of soft Ingredients the process is able to handle.

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