Frequency converter Fv is a vector control converter for universal applications

Frequency converter Fv is a vector control converter for universal applications

New Bosch VFDs save energy

The latest Rexroth VFD models are simple to use and convenient, cause less wear and tear and, most of all, bestow energy and cost savings

September 2013

Bosch Rexroth, which introduced this year three new models of VFDs (Variable Frequency Drives), was able to help a UAE hotel achieve maximum chilled water at a suitable temperature through use of the innovations.

New models it introduced were the Rexroth frequency converters Fv, Fe and EFC 3600. The company said that with demand existing among end-users for energy-efficient machines, these converters offer economical and easy-to-use solutions for various applications in which valuable energy is saved.

VFDs are a powerful way to increase motor efficiency by controlling the speed of the AC induction motor. “Rexroth products are fairly simple to use and eliminate high in-rush currents on the motor start up. This mainly decreases the mechanical wear on the motor components, which extends the life of the motor and decreases maintenance costs. This happens by varying the frequency of the power source. It’s about switching the output devices on and off,” a company statement said. “Also, in recent years VFDs costs are lower, making VFD-solutions more cost effective.”

EFC 3600 frequency converters are used
for higher energy efficiency and improved
process control

VFDs help maintain energy consumption at the right level. Recently, the Emirates Grand Hotel in Dubai, UAE, had a problem with the higher floors (35th to the 47th) having less cooled air than the lower-level floors. The reason for this was the supplied temperature of the chilled water. The temperature of the chilled water was around 12.7 C, which is a major issue because the temperature should not exceed 8 C. In addition, more power was consumed because all the pumps were running at full speed which was also causing un-balanced water pressure. These problems create less comfort for occupants and less profit for the hotel.

To solve these issues, Getco (Green Earth Technology), a specialist in cooling transfer and saving energy, chose Rexroth VFDs, as a result of which the pumps did not run at full speed all the time, which also solved the issue of un-balanced water pressure. By varying the speed of the motors, Getco was able to achieve maximum chilled water under 8 C. “We choose Rexroth VFDs because they are the most reliable on the market and known for their great German engineering.” said Dr Taoufik A Hadi, head of engineers at Getco. Bosch, as a whole, is continuously enhancing its products with the latest technologies.

Frequency converter Fe: it represents the
new and economical line of converters

Bosch Rexroth is considered the worldwide benchmark when it comes to drive, control and motion and its technology is designed for easy installation and usability. Unlike some other converters, commissioning is easy without the need of a PC or another programming device. Bosch Rexroth has the astonishing ability to offer frequency converters for the power range from 0.4 kW to 160 kW. Converters can be used in a wide range of applications such as pumps, piston compressors, HVAC fans, screw compressors, material handling, machine tools, conveyor etc. 

EFC 3600: The new EFC 3600 frequency converters with universal V/f operation are used for higher energy efficiency and improved process control. It is a compact design and up to 60 per cent smaller than previous drives. The EFC 3600 drive solution covers currently the performance range from 0.4 kW to 4 kW with a power expansion in preparation.

Fv: Frequency converter Fv is a vector control converter for universal applications. Three control modes – voltage/frequency (V/f), sensorless vector control (SVC) and vector control with encoder (FOC) – make Fv converters available for a wide range of industrial applications. Rexroth Frequency Converter Fv is the new optimised drive solution for the automation of diverse applications in the power range up to 90 kW.

Fe: Frequency converter Fe represents the economical line of converters from Rexroth. The frequency converter Fe no longer requires additional side-line units and is designed for V/f operation under rough environments. Frequency converter Fe has the ability to provide power performance from the range of 0.75 kW to 160 kW.

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