control type
1. Liquid level control: This control cabinet is equipped with a high-performance Key float switch, which automatically controls the on/off of the water supply and drainage pumps based on changes in liquid level.
2. Pressure control: External electrical contact pressure gauge or pressure controller can automatically turn on and off the pump according to changes in pipeline pressure. This type is widely used in domestic water supply and fire pressure boosting systems.
3. Temperature control: an external temperature controller that can turn on or off the pump according to the set temperature range, suitable for applications such as constant temperature and heat exchange systems that require temperature control.
4. Time control: The chassis panel is equipped with a time setting button and a display, allowing users to control the on and off of the water pump according to their timing needs. It is suitable for controlling various timed or regular intermittent working modes.
characteristic analysis
1. Save energy
Compared with traditional control motors, energy conservation is the most practical significance for frequency converter controlled motors. The motor operating conditions supplied according to the demand for water injection and oil transportation are economical, which can save 48.8% of electricity
2. Reduced operating costs
The operating cost of traditional motors consists of three components: initial procurement cost, maintenance cost, and energy cost. The energy cost accounts for approximately 77% of the operating cost of the motor. By reducing energy costs by 44.3% and minimizing the impact of variable frequency starting on equipment, maintenance and repair costs will also decrease, resulting in a significant reduction in operating costs.
3. Improve pressure control accuracy
The variable frequency control system has precise pressure control capability. Match the pressure output of the motor with the required water injection amount of the system. The output of the variable frequency control motor changes with the change of motor speed. Due to the improved accuracy of variable frequency control of motor speed, it can keep the system pressure variation of the pipeline network within a range of 3pisg, that is, within a range of 0.2bar, effectively improving the quality of working conditions.
4. Extend the service life of the motor
The frequency converter starts the motor from 0HZ, and its starting acceleration time can be adjusted to reduce the impact on the electrical and mechanical components of the motor during starting, enhance the reliability of the system, and extend the service life of the motor. In addition, frequency conversion control can reduce current fluctuations during unit start-up, which can affect the electricity consumption of the power grid and other equipment. Frequency converters can effectively minimize the peak value of start-up current.
5. Reduced the noise of the motor
According to the requirements of the motor's operating conditions, after installing variable frequency speed regulation, the motor's operating speed significantly slows down, effectively reducing the noise during motor operation.
Working principle of frequency converter
Usually, a device that converts AC power with fixed voltage and frequency into AC power with variable voltage or frequency is called a "frequency converter". The device first needs to convert three-phase or single-phase alternating current into direct current (DC). Then convert direct current (DC) into three-phase or single-phase alternating current (AC). The frequency converter simultaneously changes the output frequency and voltage, that is, changes n0 on the motor operating curve, causing the motor operating curve to move down in parallel. Therefore, the frequency converter can enable the motor to achieve a larger starting torque with a smaller starting current, that is, the frequency converter can start heavy loads.
Variable frequency drives have basic functions such as voltage regulation, frequency modulation, voltage stabilization, and speed control. Their internal structure is complex but easy to use, so they are not only used to start electric motors, but are widely used in various fields, with various powers, shapes, volumes, and purposes. With the development of technology and the reduction of costs, frequency converters will definitely be more widely used.
Function Introduction
1. Power switching and protection function of variable frequency control cabinet
Variable frequency control cabinets are usually designed with circuit breaker components, which are connected to the incoming power supply and can help the cabinet complete the on/off operation of the circuit. They can also provide protection in the event of a short circuit or overload between the circuit and the frequency converter. In addition, the frequency conversion cabinet can also cut off the power supply during motor maintenance to ensure the safety of operators.
2. Variable frequency speed regulation function of variable frequency control cabinet
The control panel of the variable frequency control cabinet is equipped with a potentiometer for variable frequency speed regulation, which can transmit command signals to the motor and control the motor speed according to the output frequency of the operator. Some products in the frequency conversion control cabinet are equipped with a power frequency switching function to ensure that in the event of a frequency converter failure, the motor is switched back to the power frequency supply through an automatic control circuit.
3. The intuitive control function of the variable frequency control cabinet
The cabinet body of the variable frequency control cabinet is designed with display devices and operation panels, which are connected to the electrical components inside the variable frequency control cabinet. They can intuitively display the operating status of the variable frequency control cabinet, and facilitate operators to control the operation of the variable frequency device and perform on-site operations on controlled equipment such as motors.
On the cabinet of the variable frequency control cabinet, various instruments and indicator lights are also installed, such as voltage meters, ammeters, frequency meters, as well as power indicator lights, alarm indicator lights, operation indicator lights, power frequency indicator lights, etc. The operation and status of the variable frequency control cabinet can be directly reflected on various instruments and indicator lights, achieving real-time monitoring of the working status of the variable frequency converter.
4. Safety protection function of variable frequency control cabinet
The frequency conversion control cabinet concentrates various electrical components, including the frequency converter, inside the cabinet, which can reduce the impact of external environment on electrical components, lower the degree of environmental pollution on electrical components, and also reduce the risk of electric shock for operators of the frequency conversion control cabinet. Therefore, it has a good safety protection effect.
1. Variable frequency control cabinet Directly start the control cabinet
Control motor power: 0.37-15KW;
Control voltage: 380V;
Control the number of water pumps: 1-4.
2. Variable frequency control cabinet Triangle start
Control motor power: 15-90KW;
Control voltage: 380V;
Control the number of water pumps: 1-5.
3. Variable frequency control cabinet Automatic pressure reduction start control cabinet
Control motor power: 15-160KW;
Control voltage: 380V;
Control the number of water pumps: 1-5.
4. Variable frequency control cabinet Fully automatic variable frequency speed control cabinet
Control motor power: 0.18-250KW; Control voltage: 380V;
Number of control motors: 1-7 units;
Pressure control accuracy: 0.02MPa or -0.02MPa.
LED display power supply field
Stage rental and distribution areas
Lighting lighting engineering and distribution areas
Smart industrial control
Low voltage distribution system
Operation and maintenance management system of Internet of things
