Pumps are needed to adjust the power of the engines. As a result, the pressure in the system is maintained at the proper level. High-quality converters can save a large number of electricity. And this should be taken into account. In this case, pumps can be used in a variety of ways. The most common are systems for supplying water to the house. Also, converters are needed for circulation pumps. Additionally, they can be installed in fountains and aquariums.
Features of converters
The hallmark of all pump converters is their simplicity. At the same time, they do not require any maintenance and work completely automatically. Additionally, it is possible to control them through a personal computer. You can also set individual schedules for the device. At the same time, their efficiency is about 90%. You should also know that pumps with converters do not need an expansion tank. Thus, the pressure is always maintained at an optimal level.
What are the characteristics of the converters?
Input voltage and power are considered important characteristics of converters. Additionally, the manufacturer always indicates the type of control. To date, there are scalar and vector regulation of the device. The rated current parameter depends on the power of the model. You can also highlight the output frequency. It is usually specified in the range from 0.1 to 600 Hz. The overload capacity is calculated as a percentage. The degree of protection of the converter housing is indicated by a special marking. Working temperature device manufacturer is also required to indicate. Among other things, it is necessary to highlight the parameter of acceleration time, as well as braking.
Reviews of converters "Danfoss 2800"
The Danfoss frequency converter is quite easy to maintain as well as operate. In this case, dense installation of equipment is allowed. This is largely due to a reliable cooling system. To control the level of pressure in the device, special sensors are provided. Separately, it is worth mentioning the high-quality PID controller. The input is 220 V, and the power is 0.2 kW.
The output frequency ranges from 0.1 to 600 Hz. The frequency converter is controlled by a vector method. The full acceleration time takes an average of 30 seconds. Degree of protection of the body - class "IP20". The dimensions of this unit are as follows: height - 174 mm, width - 73 mm, and depth - 135 mm. The Danfoss 2800 frequency converter costs about 11 thousand rubles.
Model INVT GD10: specifications and reviews
Many customers appreciate these pump frequency converters for their large number of digital inputs. Among other things, the presence of a relay output should be highlighted. This converter can be used at temperatures from -10 to +50 degrees. The manufacturer provides a built-in PID controller.
Also, many positively appreciated the multifunctional keyboard. With its help, you can quickly access absolutely all parameters. Input voltage this device The rated power of the motor is 0.2 kW, and the frequency ranges from 0 to 400 Hz. The rated current parameter is 1.6 A. The degree of protection of the housing is IP20 class. The overload capacity of this converter is 150%. This model will cost the buyer 12 thousand rubles.
Converter "Vesper E3-8100"
The frequency converter "Vesper E3-8100" is able to boast of its modest size. Among other things, it has special communication adapters that are designed for the network. It should also be noted convenient optional remote control. It is equipped with modern software. Printed circuit boards protection devices are lacquered.
Dense installation of devices by the manufacturer is allowed. The type of control in this converter is vector. The rated power of the device is 0.75 kW, and the output voltage is 22 V. The output frequency of the device fluctuates around 200 Hz. The total acceleration time is 30 seconds and the deceleration time is 50 seconds. The degree of protection of the case is set to the class "IP20". The unit can be operated at temperatures from -10 to +50 degrees. The frequency converter "Vesper E3-8100" costs 13 thousand rubles.
INVT GD15 Converter Parameters
Voltage regulation in this converter occurs in automatic mode. There are five digital inputs in total. The PID controller is built-in type. The manufacturer also provides support for all standard programs. The keyboard is multifunctional and provides quick access to the system. Separately, it is worth mentioning the EMC filter, which is built into the case. This single-phase control converter is of the scalar type.
The input voltage of the device ranges from 205 to 235 V, and the motor power is 0.4 kW. The output frequency is at around 300 Hz. In turn, the rated current indicator is 2.5 A. Within 10 seconds. the overload capacity of the converter is 180%. This model has the following dimensions: height - 140 mm, width - 80 mm, and depth - 134 mm. This device will cost the buyer 14 thousand rubles.
Reviews about the model INVT GD20
These frequency converters for pumps are in great demand and have good system protection. Analog inputs and outputs are provided by the manufacturer. Also of note is the built-in C485 port with support for many standard programs. The braking module is built-in type. The EMC filter is available in class C2. The converter protection system copes quite well with different kind interference.
If necessary, the remote control in the device can be easily disconnected. The dimensions of the converter are quite compact and at the same time its weight is only 1.5 kg. The rated power of the unit is at the level of 0.7 kW, and the frequency fluctuates around 200 Hz. The rated current parameter is 4.2 A. The device can be used at temperatures from -10 to +40 degrees. Separately, it is worth mentioning the good overload capacity. The control type, in turn, is of the scalar type. This frequency converter costs (market price) about 12 thousand rubles.
Opinion of buyers about the device "Hyundai 700E"
This Hyundai frequency converter differs from other devices by its high-quality PID controller. In this case, the braking module is installed built-in type. The control panel is quite convenient and is equipped with a potentiometer to control the speed. This model is suitable not only for pumps, but also for fans. Among other things, it is often installed on various conveyors. The EMC filter is of built-in type.
The drives for this model are suitable from different manufacturers, and this is very convenient. The device is installed quite simply and is comfortable to use. For commissioning, you can use "Flashdrop". The type of control in this model is classified as scalar. The input voltage of the device ranges from 200 to 240 V. At the same time, the operating power single phase motor is 0.37 kW. We should also mention the wide range of output frequencies. The rated current parameter is at the level of 2.4 A, and the overload capacity is 150%. The degree of protection in the converter is set to class "IP20". The height of this unit is 202 mm, width - 75 mm, and depth - 142 mm, with a mass of 1.1 kg. The Hyundai 700E frequency converter costs 12 thousand rubles in a specialized store.
Characteristics of the converter "Schnider AT12"
Connection frequency converter"Schnyder AT12" to circulation pumps is quite simple. This model differs from other devices in compactness and high performance. Among other things, the versatility of the device should be noted. Manufacturers have paid much attention to the security system.
The overload capacity parameter remains 150%. The motor is single-phase, with a power of 0.18 kW. In this case, the rated current parameter is 1.4 A. The total acceleration time is 20 seconds, and the deceleration time is 55 seconds. The output frequency indicator is on average at around 250 Hz. At the same time, it can rise to a maximum of 400 Hz. In turn, the input voltage of the converter is 220 V. This model costs 14 thousand rubles in the store.
Model "Lovara H3"
Frequency converters for Lovar N3 pumps have acceptable characteristics, but have one drawback. It is associated with the formation of condensate. This largely depends on unprotected contacts. The possibility of synchronous operation in this model is provided. It should also be noted the versatility of the device. Starting and stopping the engine can be done remotely. Current signals are received from 4 to 20 mA.
Temperature environment should be between 5 and 40 degrees. Depending on the pressure in the system, the engine speed is controlled automatically. The input voltage indicator is at the level of 400 V. The rated power of a three-phase motor is 3 kW. This model will cost the buyer 15 thousand rubles.
Converter FC-051
The frequency converter FC-051 is actively used for pumps and ventilation systems. This model is distinguished by a high-quality control unit. It should be noted and a good interface of the device. You can connect this converter to a personal computer. The blocking of the mechanical seal occurs automatically.
If necessary, the remote control can be easily detached. At the same time, the device can be launched from any distance remotely. At elevated pressure, the protective system immediately activates and blocks the engine. It also protects the system from various power surges. This model has an LED display. At the same time, only the most necessary indicators are available on the control panel. The noise level of the electric motor is within the normal range. This was largely achieved due to a high-quality variator that produces a stable frequency at 8 kHz.
To cool the entire converter, there is powerful fan. It is installed at the base of the frame and securely fastened. In this case, the device can be used for a long time and not overheat. Additionally, it should be noted that the tracking system constantly monitors the external pressure. On centrifugal pumps this model can be installed. The control sensor can withstand a maximum output signal of up to 20 mA. This frequency converter costs (market price) about 16 thousand rubles.
Automation can be used in control systems for household electric pumps different types— from the simplest inexpensive relays to complex blocks electronic control, exceeding the price of simple automation dozens of times. The most promising and high-tech devices for controlling pumping equipment are devices that change the frequency of the supply voltage of pumps.
Frequency conversion, compared with the usual connection scheme for electrical pumping equipment using a pressure switch, has the following advantages:
- Allows you to maintain a constant pressure in the system, regardless of the volume of water consumption. Automation monitors the pressure and changes the speed of work electric pump.
- The water main is practically not subject to water hammer, and therefore the accumulator can be replaced with a device of a smaller volume or completely excluded from the system.
- Frequency regulation provides smooth start and stop of the electric pump - this increases its service life by eliminating sudden voltage surges from the operating mode, which most often lead to the failure of any electrical equipment.
- Well pumps with frequency regulation significantly save electricity - they do not inject into the system overpressure when working on full power, the calculation shows that savings can be up to 50%.
- In terms of ease of use and ease of control, frequency devices are significantly superior to systems with pressure switches. To obtain the required pressure, there is no need for a long adjustment of the system using a pressure gauge by turning the screws in the relay - just select the required value on the control panel of the device by pressing the appropriate button.
The principle of operation of the frequency converter
Regulating the speed of rotation of the motor shaft by reducing the number of its revolutions by changing the frequency of the supply voltage is the only way to obtain a low performance of the electric pump without reducing the efficiency.
Frequency control method asynchronous motor was formulated back in the 30s by the Soviet academician Kostenko, its technical implementation occurred much later after the appearance of powerful semiconductor devices - thyristors.
Rice. 2 Functional diagram of frequency control of asynchronous three-phase motor The electronic control circuit for an asynchronous three-phase motor, which allows you to change its speed by changing the frequency and amplitude of the supply voltage, consists of three main blocks:
Chain direct current. The electronic elements of the circuit are rectifiers and filters that convert alternating current frequency 50 Hz. voltage 380 V. constant pressure.
Power pulse inverter. Transistor semiconductor devices implement pulse-width modulation, operating in a key mode, that is, they are in an open (off) or closed (saturation) state. In the first case, their resistance tends to infinity and the current in the circuit is very small, so the voltage drop across the transistors is small, as is the power dissipation. When opening voltage is applied p-n resistance transition tends to zero and the voltage drop across the transistor is negligible, as is the power dissipated on it. Transition states cause a significant increase in the power released on the transistors, but last a short period of time without causing overheating of devices and their failure. Control circuits with frequency (pulse-width) conversion have an efficiency of about 98%.
Rice. 3 Control pulses in the PWM circuit At the output of the transistor switches, voltage is obtained in the form of pulses of the same amplitude with different durations. The control system organizes the operation of transistor switches by setting the time of their open and closed state - the pulse width changes accordingly.
Induction motor drives use three-level pulse-width modulation with pulses of positive and negative polarity. The motor winding is supplied with an alternating rectangular pulse voltage (V), while the magnetic flux in the stator (B) has a sinusoidal shape.
Popular models of frequency converters
Frequency converters for water supply pumps can replace any automation with a relay to provide the benefits described above. They are suitable for all types of electric water pumps with asynchronous motors, the models have a lot of additional functions.
ERMAN series ER-G-220-02 "ERMANGIZER" (340 c.u.) - one of the first domestic frequency converters designed to control a single-phase asynchronous motor, works in conjunction with an electric pressure meter ADM 100 (47 c.u.).
Rice. 4 ERMAN series ER-G-220-02 and its connection diagram Features of the ERMAN frequency converter of the ER-G-220-02 series
- maximum current: 4.6 A.;
- maximum pressure: 6 bar.;
- power supply: 220v;
- maximum temperature: 50 C;
- protection class: IP20;
- output voltage: 15 V;
- line input: 4 to 20 mA. (100 Ohm);
- operating temperature range: -10…+50 С;
- setting gradation: 0.1 bar.;
- pressure protection threshold: 5.5 bar;
- pressure factory setting: 4 bar.
ITALTECNICA SIRIO ENTRY 230 (350 c.u.) is a frequency converter for a borehole pump with dry-running protection, indication of pressure and malfunctions in the operation of the system or pump, has a remote control.
Figure 5. ITALTECNICA SIRIO ENTRY 230 Features ITALTECNICA SIRIO ENTRY 230
- type: frequency converter;
- supply voltage: 220 - 230V.;
- turn-off pressure control range: 1.5 - 7.0 bar.;
- connection: 1.2″;
- maximum power: up to 1.5 kW.;
- maximum pressure in the system: up to 8 bar;
- maximum output current at start-up: 12 A.;
Using a frequency converter to control an electric pump will not only extend the life of the water supply equipment, improve ease of use and adjustment, but can also become cost-effective over time. An expensive device will pay off faster with intensive water intake using powerful electric pumps.
Pumps used in autonomous water supply and heating systems are productive, but at the same time quite costly equipment in terms of operation due to the high level of energy consumption. You can reduce costs and significantly extend the life of the pump by equipping it with a frequency converter, which we will discuss in this article.
You will find out why you need and what functions a frequency converter performs. The principle of operation of such devices, their varieties, specifications and recommendations are given for the choice of converters for borehole and circulation pumps.
1 Why do you need a frequency converter?
Almost all modern pumps sold in the budget and middle price categories are designed according to the throttling principle. The electric motor of such units always operates at maximum power, and the change in the flow / pressure of the fluid supply is carried out by adjusting stop valves, which changes the cross section of the through hole.
This principle of operation has a number of significant drawbacks, it provokes the appearance of water hammer, since immediately after turning on the pump begins to pump water through the pipes at maximum power. Another problem is the high energy consumption and rapid wear of the system components - both the pump and the shut-off valves with the pipeline. Yes, and there can be no talk of fine-tuning such a water supply system at home from a well.
The above disadvantages are unusual for pumps equipped with a frequency converter. This element allows you to effectively control the pressure created in the water supply or heating pipeline by changing the amount of electricity supplied to the motor.
As you can see in the diagram, pumping equipment is always calculated according to the power limit parameter, however, in maximum load mode, the pump operates only during periods of peak water consumption, which is extremely rare. In all other cases, the increased power of the equipment is unnecessary. The frequency converter, as statistics show, allows you to save up to 30-40% of electricity during the operation of circulation and borehole pumps.
1.1 Device and operation algorithm
A frequency converter for water supply pumps is an electrical device that converts the direct voltage of the mains into an alternating voltage according to a predetermined amplitude and frequency. Almost all modern converters are made according to the double current change scheme. This design consists of 3 main parts:
- uncontrolled rectifier;
- pulse inverter;
- control system.
The key design element is a pulse inverter, which in turn consists of 5-8 transistor keys. A corresponding element of the stator winding of the electric motor is connected to each of the keys. Foreign converters use IGBT class transistors, while Russian converters use their domestic counterparts.
The control system is represented by a microprocessor, which simultaneously performs the functions of protection (turns off the pump in case of strong current fluctuations in the mains) and control. In borehole water pumps, the control element of the converter is connected to a pressure switch, which allows the pumping station to operate in a fully automatic mode.
The operation algorithm of the frequency converter is quite simple. When the pressure switch determines that the pressure level in the hydraulic tank has fallen below the permissible minimum, a signal is transmitted to the converter and it starts the pump electric motor. The engine accelerates smoothly, which reduces the hydraulic loads affecting the system. Modern converters allow the user to independently set the acceleration time of the electric motor within 5-30 seconds.
During the run-up process, the signal transmitter continuously reports the pressure level in the pipeline to the transmitter. After it reaches the required value, the control unit stops acceleration and maintains the set engine speed. If the water point connected to the pumping station begins to consume more water, the converter will increase the supply pressure by increasing the pump capacity, and vice versa.
1.2 Operation of the pump in tandem with a frequency converter (video)
If the pump you are using does not have a built-in frequency converter, then you can purchase and install such a power controller yourself. As a rule, pump manufacturers in the technical data sheet indicate which particular converter is suitable for this equipment model.
- Power - the voltage converter is always selected based on the power of the electric drive to which it is connected.
- Input voltage - indicates the current strength at which the converter remains operational. Here it is necessary to choose with an eye to the fluctuations that may be in your power supply (low voltage leads to the device stopping, with increased voltage it can simply fail). Also consider the type of pump motor - three, two or single phase.
- Adjustment frequency range - for borehole pumps, the optimal range will be 200-600 Hz (depending on the initial power of the pump), for circulation pumps 200-350 Hz.
- The number of moves and control outputs - the more of them, the more commands and, as a result, the converter operating modes, you can configure. Automation allows you to set the speed at start-up, several modes of maximum speed, acceleration rates, etc.
- Control method - for a borehole pumping station, it will be most convenient to use remote control, which can be located inside the house, while a converter with a remote control is perfect for circulation pumps.
If you have filtered out all the devices on the market and are faced with the fact that there is simply no equipment suitable for its characteristics, you need to narrow down the selection criteria to a key factor - the current consumed by the motor, according to which the rated power of the converter is selected.
Also, when choosing a frequency control unit, especially from domestic or Chinese manufacturers, consider the warranty period. By its duration, one can indirectly judge the reliability of the technique.
A few words about manufacturers. The leading company in this area is Grundfoss (Denmark), which supplies the market with over 15 different models of converters. So, for pumps with a three-phase electric motor, the Micro Drive FC101 model is suitable, for single-phase pumps (operating from a standard 220V mains) - FC51.
More affordable in terms of price is equipment from Rockwell Automation (Germany). The company offers a line of PowerFlex 4 and 40 converters for low-power circulation pumps and a PowerFlex 400 series for borehole pumping stations (3 pumps connected in parallel can work from one converter at once.
Keep in mind that the price of a good converter can sometimes reach the cost of a pump, so the connection and configuration of such a device should be carried out exclusively by specialists.
Most common industrial models of frequency converters can be used to control pumps, but for this they need to be programmed in a special way.
Frequency converters for pumps are adapted instruments and show top scores when working with pumping equipment. Frequency converters for pumps are more economical and functional in their field.
Models of devices and analogues
The table below shows short review several pump-optimized models. Detailed information by models can be obtained on the card of the corresponding frequency converter.
| Model | Power range | Entrance | Exit | Protection level | Medium temperature | Notes, features |
| PD20 |
0.75…18.5 kW | 3F 380V | Output frequency 0…50/60 Hz |
IP65 | -10…+40°С | Fully featured, high protection drives, motor-mountable, dedicated for multi-pump applications |
| 0.37…2.2 kW | 1F 220V | Output frequency 0…50/60 Hz |
IP65 | -10…+40°С | Fully featured, high protection inverters, can be mounted on the motor, specialized for single small pumps | |
| 15…315 kW | 3F 380V | Output frequency 0…400 Hz |
IP20 | -10…+40°С | Scalar control, multi-functional outputs and inputs, full range of pump functions | |
| 0.75…400 kW | 3F 230V 3F 460V |
PID | IP20 | -10…+50°С | Specialized Models | |
| 0.75…220 kW | 3F 230V 3F 460V |
PID | IP20 | -10…+40°С | Special models available | |
| 0.4…4 kW | 1F 220V 3F 380V |
Output frequency 0…600 Hz |
IP20 | -10…+50°С | For pumps and fans |
Applications for frequency converters for pumps
Pump inverters are optimized for the following applications:
- Ventilation and air conditioning systems (compressors, etc.)
- Housing and communal services, water supply and sanitation systems, heating (hot pumps / cold water, boiler room equipment, sewerage)
- Energy (equipment of thermal power plants, thermal power plants, boiler units)
- Technological lines in the processing industry (sand, slurry pumps)
- Other pumping units (booster stations for water networks or power distribution points)
- Submersible, borehole pumps
Despite the above applications, such devices are also suitable for general industrial applications.
Purpose of frequency converters for pumps
- Optimized control in pumping systems in order to maintain certain parameters at a given level (pressure, temperature, level, flow, water consumption)
- Group control of pumps
- Saving water and electricity at enterprises, saving resources at pumping stations
- Protecting pipelines from water hammer, increasing the service life of fittings
- Full protection of electric motors in pumping installations
- Automation of pumping stations
Advantages
Frequency converters for pumps have the following advantages:
- They usually have more high level protection
- Thanks to their specialization, they implement the most efficient control in pumping systems.
- In most cases, they are multifunctional devices that can fully automate the pumping station.
Flaws
The disadvantages of devices are influenced by the principles of regulation used in them. Depending on whether it is a scalar or a vector converter, certain disadvantages are inherent in it. (links to pages)
The principle of operation of frequency converters for pumps
The frequency converter for pumps converts the input power voltage into the output voltage that is optimal for the selected operating mode of the pump. In this case, a control loop is formed in the system with feedback according to the selected parameter (for example, according to the water pressure in the water supply system). The pressure sensor transmits information to the electronic unit of the inverter, and the converter, in turn, changes the output (frequency, voltage) in one direction or another to maintain a constant water pressure in the pipeline.
Examples are shown in the figures:
Pump station for two pumps
(automatic pressure maintenance, start-up additional pump from the network)
Many pumps are used in building life support systems. They perform a wide variety of functions. The most famous of them is a circulation pump for heating systems. Apart from circulation pumps in systems for various purposes are used:
- pumping units for increasing pressure, necessary to supply water to the building with insufficient pressure in the city water supply system;
- circulation pump for heating systems;
- pumps for DHW systems that provide hot water at any time at any tap;
- pumps for removal and drainage of sewage and dirty water;
- pumps for fountains and aquariums;
- pumps for fire fighting applications;
- pumps for cold water and cooling systems;
- pumping units using rain water for toilets washing machines, cleaning or watering;
- borehole pumps
Today, the pump is the most common, which is used almost everywhere. Open the mixer, water will flow from it, which is pumped by the pump. Each car has several pumps for oil, fuel, water, coolant. A cyclist won't hit the road without pumping up the tires. In the manufacture of an electron lamp, air is pumped out of it. Pumps inflate, pump out, pump out and pump air, water, oil, milk, gasoline and even cement. From plumbing to a rocket, from a fan to a nuclear power plant - this is the range of applications for pumps.
But the pump itself cannot work. To drive it, you need an electric motor and a pressure or vacuum control device to vacuum pumps. The most famous and widespread method of regulation in pumping system is damper control when the engine is running at full speed, and the pressure in the system is regulated using shut-off valves (gate valves, valves, taps, ball valves, etc.). If we draw parallels with driving a car, then the damper control looks something like this: the driver, pressing the gas pedal all the way, controls the speed of the car with the brake pedal.
Manage pumps more rationally and efficiently frequency converters, with which the engine is supplied required amount energy to create and maintain the required level of pressure / vacuum in the system, for example, in a pipeline. At the same time, up to 50% savings in energy consumption are achieved, and if we consider that during the life of the engine, it consumes electricity in an amount that far exceeds its cost, then this indicator turns out to be extremely relevant. For example, during a year of operation for 8 hours a day, an 11 kW engine will consume electricity in the amount of about 85 thousand rubles. A frequency converter with such parameters of work, it will pay off within a year, and in the future it will bring profit to the enterprise.
Let's consider the methods of pressure control in the pumping system described above in more detail. 
The top figure shows typical scheme calculations required power pump. The pump power for a particular system is always calculated according to the level of maximum consumption, that is, with a certain margin. The blue line shows the pump curve - the supplying part of the water supply system, which reflects the dependence of the discharge pressure on the amount of fluid flow (flow). The red line is the system curve - the consuming part of the water supply, which also displays the interdependence of the flow rate and pressure of the liquid, but in a mirror image. The intersection of these curves is the optimum point when the pump provides the required flow and the required pressure level.
But in fact, the system rarely works in this mode, only at times of peak consumption. The rest of the time, the rated power of the pump is excessive, and then in systems without regulation or with the use of a damper, the following happens: when the flow decreases, the pump creates excess pressure, which requires additional energy to create. The figure below clearly shows this.
The use of frequency converters, by reducing the engine speed and, as a result, the supplied power, allows you to change the "pump curve" by adapting it to the "system curve"
Benefits of operating a water supply system with a frequency converter
High efficiency 90%
Low energy costs
constant pressure in the system,
no need for automation
no need for maintenance,
no expansion tank required
no need for maintenance,
no need for taps, couplings and tees for diagnostics and draining expansion tank and automation
implementation in any system MODBAS, IZERNET, PROFIVAS, etc.
control of pressure, switching on, by timer, night-time mode from any panel, computer, the data is always on the screen before your eyes.
Monitoring of current, voltage, malfunctions, breaks, short circuits of the pump motor.
Water supply pump control
As you know, water consumption for economic and domestic needs fluctuates greatly during the day, during weekends and holidays. A lot of people shower, do laundry, do dishes at the same time during certain hours of the day and hardly use water at other times, for example, at night. This creates the conditions for such problems as poor water pressure in the morning and evening hours, significant daily pressure fluctuations in the water supply system and, as a result, accelerated wear of pipes and valves.
Fortunately, today pressure stabilization is not such a difficult task. Today, the issue of increasing the overall efficiency of managing water supply systems, that is, achieving maximum results with minimal energy consumption and insignificant capital investments in equipment modernization, is already more relevant. Usage frequency converters on pumping stations allows you to cope with this task brilliantly. Statistics show that the frequency converter is able to reduce energy consumption at pumping stations from 30 to 50%, and their payback period is from one to one and a half years.
The figure on the left shows the start of a pump motor using a contactor.
The figure on the right shows the start of a pump with a frequency converter.
This savings is achieved due to the fact that a frequency converter able to change the frequency of rotation of the electric motor smoothly over a wide range. In fact, this means that the pump motor will always consume exactly as much energy as is necessary to maintain a stable pressure, regardless of the current consumption of the water supply system at that particular moment. Soft start, stopping and changing the engine speed also helps to avoid hydraulic shocks in pipelines, reducing water losses and increasing the period of trouble-free operation of the pump, pipeline, valves and measuring instruments.
The video shows the principle of operation of a frequency converter in a pumping station
Selection of a frequency converter for pumps
Company Control Systems offers frequency converters for a wide variety of pump control tasks:
- control of single low-power pumps,
- cascade control of a group of pumps with replacement,
We work with many manufacturers of frequency converters KEB, OMRON, DELTA, VESPER, OPTIMELECTRO and will help you choose a frequency converter for both single-phase and three-phase motors.
