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IE3-compliant DRN motors supplied to Eastern Cape wastewater treatment plant

A major upgrade to a wastewater treatment plant in the Eastern Cape is taking advantage of the energy-saving and cost-efficiency features of the latest IE3-compliant DRN motors from SEW-EURODRIVE. The order is due to be supplied later this year.

An important feature of these motors for wastewater treatment applications is their IP 65 rating, SEW-EURODRIVE South Africa Head of Projects Rudi Swanepoel comments. A total of six units are being supplied, with two gearboxes fitted with 75 kW DRN motors, two with 45 kW DRN motors, and the remaining two with 37 kW DRN motors.


SEW-EURODRIVE has a special program to determine if the gearbox selection is adequate based on the loads and bending moments

These specific units will be used for aerator applications. “With aerator and mixing applications, our projects and engineering teams have to double check all of the loads and bending moments. These loads are supplied to us by the client, based on their designs. We then have to ensure that the gearboxes that have been selected are suited to the application at hand,” Swanepoel explains.

SEW-EURODRIVE employs a special program designed specifically to determine if the gearbox selection is adequate, based on the loads and bending moments. This is particularly important when it comes to aerators and mixers. SEW-EURODRIVE therefore selects the optimal gearbox for the application at hand.


SEW-EURODRIVE South Africa is supplying its latest IE3-compliant DRN motors to a wastewater treatment plant in the Eastern Cape

“We supplied similar gearboxes and motors to the same client for a wastewater treatment plant in the Vaal Triangle. The client has displayed confidence in both our technical support and our technology, which is how we nurture such long-standing relationships,” Swanepoel comments. “These two major projects in quick succession represent a foothold for us in this burgeoning industry, which is definitely picking up in terms of business.”

Wastewater treatment plants represent a particularly arduous application for these DRN motors, which means auxiliary instrumentation such as PT100s to measure temperature, and thermistors, which are a cut-out failsafe measure when the motor temperature reaches a set high point, are often required. Accessories included strip heaters for colder conditions, and rain canopies.

SEW-EURODRIVE now offers its energy-efficient DRN motor series as standard across its entire product range in order to reduce the total cost of ownership, which means the payback period is much quicker, and also the return on investment is that much higher. “We have always remained at the forefront of new technological and regulatory developments, and keeping the South African industry up to date is important to us and to our customers,” Swanepoel concludes.


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