Ensuring Energy Efficiency
Ensuring energy efficiency is one of the most relevant and complex tasks of today. Reducing electricity costs is a key way to increase the profitability of production and effectively utilize technological lines.
Energy-Efficient Technologies from Bosch Rexroth
The company Bosch Rexroth pays special attention to energy-efficient technologies. The most promising innovations aimed at ensuring effective operation are implemented in the company's latest equipment, specifically in the frequency converters VFC5610 and VFC3610. These devices are widely used for pump drive control and help reduce electricity consumption in water treatment and purification systems.
Working Characteristics of Frequency Converters and Electric Motors
Frequency converters have a high efficiency factor (EF), but it decreases when the output power is reduced from the rated values. It is important to note that the efficiency of the devices significantly decreases with an increasing number of starts per hour and a reduction in the duration of working time. This occurs due to additional energy losses during the startup and stopping of the electric motor, as well as the operation of thyristors.
Return on Investment
For customers, the calculation of return on investment is critically important. This includes additional costs for the downtime of units during the installation and commissioning of soft-start devices.
- The price of frequency converters is three times higher than the cost of soft-start devices for pumping units with a power of up to 22 kilowatts.
- For pumping units with a power of 350 kilowatts, the price of frequency converters can be five times higher.
Solutions for Parallel Pump Control Schemes
In most hydraulic systems, energy savings with optimal return on investment are achieved through the implementation of parallel control schemes for pumping installations, where frequency converters and soft-start devices are used.
The Best Solution?
Soft-start devices are very promising for water treatment and drainage systems, where it is necessary to control the switching on and off of pumping units for draining liquid from wells and subsequent transportation of wastewater to purification systems. Soft-start devices (USD) are characterized by high reliability and built-in functions; however, maximum energy savings and minimal payback periods for a wide range of hydraulic systems are achieved through the combination of frequency converters and USD.
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