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An Emotron FDU variable-speed drive for 690V with a 12-pulse power supply has been installed at a pumping station at Parksluizen in Rotterdam, the Netherlands.

According to the customer, it now benefits from double the pumping capacity, minimised energy consumption, improved user friendliness and low harmonic distortions.

In the Netherlands, regulating the water level in streams, lakes, ditches, moats and canals is said to be critical for most activities.

For the shipping industry, a level that is too low will cause large ships to run aground and one that is too high will make the vertical clearance under bridges insufficient.

The Hoogheemraadschap van Delfland, or the Delfland Water Board, is one of 27 water authorities responsible for maintaining dikes and dams and controlling water level and quality.

The Delfland region is one of the most densely populated and highly industrialised areas of the Netherlands, with about 1.4 million people and 40,000 businesses in an area of 41,000 hectares.

The harbour authorities of Rotterdam manage the Parksluizen locks in Rotterdam, which see about 22,000 ships passing through every year.

They consist of two locks connecting the shipping route from the Delfshavense Schie canal to the Nieuwe Maas river and the Coolhaven and Parkhaven ports.

The Delfland Water Board needed to automate the process control and increase the pumping capacity.

They turned to Bosman Watermanagement and Emotron to handle the engineering, dimensioning and commissioning of the pump and drive line.

The water board wanted an upgrade of the existing installation with a diesel-driven pump.

It believed that replacing it with an automatic electric-drive solution would offer more efficient pump control with minimised energy consumption and improved user friendliness.

A 690V installation would also allow the use of cheaper cabling and a more compact variable-speed drive thanks to the lower current.

The solution is based on a Bosman Beveron 210 pump driven by a Siemens electric motor with an output of 1,375kW.

An Emotron FDU variable-speed drive is used for the control.

An IP54-classified enclosure meant that the variable-speed drive could be installed next to the pump.

The 12-pulse variable-speed drive, in combination with a special star/delta transformer, provides a low total harmonic distortion of current (THDC).

The pump shaft rotates at a maximum of 135rpm, as the gearing is down from 1,000rpm to 135rpm.

The pump rotor and wear ring are made from durable and non-corrosive materials.

The existing diesel motor has been retained for emergency situations.

The Delfland Water Board now benefits from double the pumping capacity: 20m/s instead of 10m/s.

It has also improved the efficiency and reliability of the electrical power and has reduced stress on power distribution equipment as a result of lower harmonic distortions on the mains power.

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