Bosch Rexroth frequency converters for motors from 750 W to 160 kW provide a simple, accurate and reliable three-phase drive control solution for asynchronous AC motors. Tectra Automation recently supplied Bosch Rexroth frequency converters to two Gauteng companies aiming to reduce their energy consumption and operational expenditure through more efficient motor performance.
A packaging manufacturer in Industria, Johannesburg was supplied with a 160 kW Type Fe frequency converter to drive the company’s 75 kW air compressor in an open loop. The plant shed over 100 kVA of its power load during normal operation after it was installed.
A second company, a steel producer in Kliprivier, Gauteng, acquired an additional pneumatic component to drive its 30 kW air compressor. “We supplied a pressure transducer in a closed loop circuit to provide even greater efficiency in the way the motor is used,” says product manager, Georg Venter. “It responds to the requirements of the accumulator proportionally, relative to the pressure inside the accumulator,” he explains. “The pressure transducer from our range of Aventics pneumatic components is part of our turnkey drive solutions for air compressors.” Tectra Automation deliberately oversized the electrical panel it had built for this customer, as the company plans to fit another VSD for its second compressor at a future date. In addition to curtailing the sudden power spikes associated with overcoming motor inertia, the frequency converters also reduce the mechanical stress exerted within the system, thus prolonging the life of the affected mechanical components.
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