Electricity + Control

A major wastewater treatment project in the Vaal Triangle has become the first recipient in South Africa of the new IE3 compliant DRN motors from SEW-EURODRIVE. The new energy-efficient motors were introduced at Electra Mining 2016.

the new ie3 The initial order is for ten complete units, with gearboxes and motors (six 45 kW motors and four 55 kW motors), Head of Projects Rudi Swanepoel comments. 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.

“Our calculation program has been 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. Thus these are not off-the-shelf products, but have been selected specifically for the system in question.”

SEW-EURODRIVE also had to comply with stringent specifications in terms of these motors, due to the arduous conditions on-site in the wastewater treatment plant. These included the addition of auxiliary instrumentation such as PT100s (to measure temperature) and thermistors (a cut-out failsafe when the motor temperature reaches a set high point). Other additional accessories included strip heaters for colder conditions, and rain canopies.

Enquiries: Jana Klut. Email JKlut@sew.co.za

 

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