A major upgrade to a wastewater treatment plant in the Eastern Cape is taking advantage of the energy-saving 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 IP65 rating,” comments SEW-Eurodrive South Africa head of projects, Rudi Swanepoel. “A total of six units are being supplied, with two gearboxes fitted with 75 kW motors, two with 45 kW motors, and the remaining two with 37 kW motors.”
The 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,” explains Swanepoel.
SEW-Eurodrive employs a special program designed specifically to determine if the gearbox selection is adequate, based on the loads and bending moments, which is particularly important when it comes to aerators and mixers. Wastewater treatment plants represent a particularly arduous application for these 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.
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