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WEG variable speed drives (VSDs) offer the agricultural sector reduced operating costs on automated water collection and irrigation systems with a reduction in energy consumption during periods when the pump motor speed can be reduced.

The WEG VSD monitors pumping operations functions, including special functions that not only save operating costs but optimise, control and protect the entire irrigation system. Just as significant is the VSD’s ability to automatically send commands to the electric motor, thereby facilitating optimum control of the pumping installation’s speed and irrigation volumes. This allows greater effectiveness when irrigating and more optimal water use.

VSD pumping solutions water collection

The WEG CFW 700 frequency inverter or VSD provides accurate speed variation for the electric motor ensuring it operates according to the irrigation system’s pressure needs. With all the necessary field telemetry, it can also take different land inclinations into account. Another important benefit is the VSD’s ability to detect low pressure, which may indicate leakage in a pipeline. With this early warning from the WEG VSD, end-users can eliminate the need for specialised equipment and can take remedial action as soon as possible.

Where water is being pumped from a river to a dam for further irrigation, use of the WEG VSD allows optimum control of the water level. It prevents overflow situations and dry pumping can be set up without the addition of flow sensors. The drive can be used to facilitate sleep and wake modes in the pump operation. This facilitates significant cost savings as pumping can then be automatically done on a demand driven basis.

In addition, where there are multiple pumps in use at the same pump station, WEG Pump Genius Software and the WEG CFW11 VSD make it possible to automatically alternate motor usage to ensure that each motor/pump combination has equal operating time. This avoids one pump being subjected to excessive wear, regulates the wear across all the pumps in the system and results in the lowest total cost of ownership for the installation.

Optimisation of water use in the agribusiness undoubtedly improves product quality and production between harvests and enables optimum land use. WEG VSDs are a valuable tool for achieving this.

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Peter Middleton
Email: mechchemafrica@crown.co.za or peterm@crown.co.za
Phone: +27 11 622 4770
Fax: +27 11 615 6108

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Phila Mzamo
Email: philam@crown.co.za
Phone: +27 11 622 4770
Fax: +27 11 615 6108

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Brenda Karathanasis
Email: brendak@crown.co.za
Phone: +27 11 622-4770
Fax: +27 11 615-6108


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Crown Publications, one of South Africa’s largest business-to-business publishing houses, came into existence in 1986. Since then, the company has grown from producing a single magazine, Electricity SA (renamed Electricity+Control), to publishing six monthly magazines, three quarterlies, and a number of engineering handbooks.

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