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Fan and water pump dedicated frequency converter
Fan and water pump dedicated frequency converter
Product details
Energy saving principle of frequency conversion
To maintain the pressure of the liquid supply network constant, a pressure transmitter is installed as a feedback element in the management of the pipeline system according to the feedback theorem. Due to the long and large diameter of the water supply system pipeline, the filling of the pipeline network is slow. Therefore, the system is a large lag system and it is not easy to directly use PID regulators for control. Instead, PLC is used to participate in the control to achieve the regulating effect of the control system
Principle of Variable Frequency Control
Using variable frequency speed regulation to achieve constant pressure liquid supply has a significant energy-saving effect compared to using regulating valves to achieve constant pressure liquid supply (which can be calculated according to specific situations). Its advantages are:
1. Starting balance, the starting current can be limited within the rated current, thus avoiding the impact on the power grid during starting;
2. Due to the decrease in the average speed of the pump, the service life of the pump and valves can be extended;
3. Can eliminate the hydraulic hammer effect during start-up and shutdown;
Generally speaking, when a frequency converter controls an electric motor, it is only necessary to match the capacity of the motor equipped with the frequency converter with the actual motor capacity. When a frequency converter controls two motors simultaneously, the capacity of the motor equipped with the frequency converter should be equal to the sum of the capacities of the two motors. But if the liquid output during peak load is much different from the full speed liquid supply of two water pumps, it is possible to consider reducing the capacity of the frequency converter appropriately, but sufficient capacity should be reserved.
Although the liquid pump operates at low speeds, the working current of the electric motor is relatively small. However, when the flow rate of the pump changes frequently, the motor will be in a state of frequent acceleration and deceleration, and the current for acceleration and deceleration may slightly exceed the rated current of the motor, causing overheating of the motor. Therefore, thermal protection for electric motors is necessary. For the temperature rise accumulated due to frequent speed increase and decrease, the electronic thermal protection function inside the inverter is difficult to protect, so a thermal relay should be used for motor thermal protection.
In terms of preset main functions, the maximum frequency should be based on the rated frequency of the motor as the maximum operating frequency of the frequency converter. When using a PID controller, the acceleration and deceleration times should be set as short as possible to avoid affecting the dynamic response process determined by the PID controller. If the frequency converter itself has PID regulation function, as long as the PID function is set to be effective during the preset, the set acceleration and deceleration time will automatically become invalid.
Characteristics of Constant Pressure Liquid Supply System
1. Energy saving: Optimized energy-saving control software enables the motor to achieve maximum energy-saving operation;;
3. Reliable operation: The soft start of the pump is achieved by a frequency converter, allowing the pump to switch from power frequency to frequency conversion without impact, preventing pipeline impact, avoiding pipeline pressure exceeding the limit, and preventing pipeline rupture.
4. Networking function: Using fully Chinese industrial control configuration software, real-time monitoring of various stations, such as motor voltage, current, operating frequency, pipe network pressure, and flow rate. And it can accumulate the electricity consumption of each station, accumulate the liquid output of each pump, and provide various forms of printed reports for analysis and statistics.
5. Flexible control: manually select the working mode.
6. Complete self-protection function: If a pump malfunctions, it will actively send an alarm message to the upper computer and start the backup pump to maintain water supply balance. In case of a malfunction in the self-control system, users can directly operate the manual system to protect the water supply.
Application of fans
Traditional flow design is based on the maximum air volume requirement, and its adjustment methods are controlled by baffles, air doors, reflux, start stop, etc., which cannot form a closed-loop control and do not consider energy-saving factors. The electrical control adopts direct or step-down starting, which has a significant impact on the mechanical and electrical control components of the equipment, resulting in a short lifespan of the transmission system, high vibration and noise, a large required power supply (grid) capacity, and low power factor, which are the main problems. Using a frequency converter to retrofit equipment has great advantages.
The effect of using Lingke frequency converter for fan load
1. Depending on the purpose and specific performance, the energy-saving effect can reach 20% -45%. Theoretically, the investment cost can be recovered in six to eight months.
2. The drive motor can be soft started without 7 times the impulse current required for starting
3. It can infinitely adjust the speed to avoid mechanical resonance points and operating noise
4. By detecting physical quantities and inputting them into the PID port, a closed-loop automatic control system can be formed
5. Capable of detecting blockages or ruptures in pipelines
6. Soft start characteristics can extend the operating life of mechanical loads
7. Can be designed as a constant pressure control air supply system
Technical features:
The biggest feature of the INVT-P9 series frequency converter is its energy-saving and automatic control, which has corresponding application functions in handling the starting, stopping, and operating characteristics of various pump and fan loads.
1. Built in P1 function, can accept multiple given and feedback signals, and can be programmed to set analog signals;
2. Simple PLC, speedometer, and timing function to achieve one to three control of fixed frequency conversion;
3. The automatic energy-saving function detects the characteristics of negative transportation zones and adjusts the optimal output state, improving energy savings by 4-8%;
4. Light load detection alarm or shutdown to prevent motor or water pump from burning out. Equipped with fire water supply and waterproof hammer function;
5. S-shaped curve operation, rich control and operation protection functions.
To maintain the pressure of the liquid supply network constant, a pressure transmitter is installed as a feedback element in the management of the pipeline system according to the feedback theorem. Due to the long and large diameter of the water supply system pipeline, the filling of the pipeline network is slow. Therefore, the system is a large lag system and it is not easy to directly use PID regulators for control. Instead, PLC is used to participate in the control to achieve the regulating effect of the control system
Principle of Variable Frequency Control
Using variable frequency speed regulation to achieve constant pressure liquid supply has a significant energy-saving effect compared to using regulating valves to achieve constant pressure liquid supply (which can be calculated according to specific situations). Its advantages are:
1. Starting balance, the starting current can be limited within the rated current, thus avoiding the impact on the power grid during starting;
2. Due to the decrease in the average speed of the pump, the service life of the pump and valves can be extended;
3. Can eliminate the hydraulic hammer effect during start-up and shutdown;
Generally speaking, when a frequency converter controls an electric motor, it is only necessary to match the capacity of the motor equipped with the frequency converter with the actual motor capacity. When a frequency converter controls two motors simultaneously, the capacity of the motor equipped with the frequency converter should be equal to the sum of the capacities of the two motors. But if the liquid output during peak load is much different from the full speed liquid supply of two water pumps, it is possible to consider reducing the capacity of the frequency converter appropriately, but sufficient capacity should be reserved.
Although the liquid pump operates at low speeds, the working current of the electric motor is relatively small. However, when the flow rate of the pump changes frequently, the motor will be in a state of frequent acceleration and deceleration, and the current for acceleration and deceleration may slightly exceed the rated current of the motor, causing overheating of the motor. Therefore, thermal protection for electric motors is necessary. For the temperature rise accumulated due to frequent speed increase and decrease, the electronic thermal protection function inside the inverter is difficult to protect, so a thermal relay should be used for motor thermal protection.
In terms of preset main functions, the maximum frequency should be based on the rated frequency of the motor as the maximum operating frequency of the frequency converter. When using a PID controller, the acceleration and deceleration times should be set as short as possible to avoid affecting the dynamic response process determined by the PID controller. If the frequency converter itself has PID regulation function, as long as the PID function is set to be effective during the preset, the set acceleration and deceleration time will automatically become invalid.
Characteristics of Constant Pressure Liquid Supply System
1. Energy saving: Optimized energy-saving control software enables the motor to achieve maximum energy-saving operation;;
3. Reliable operation: The soft start of the pump is achieved by a frequency converter, allowing the pump to switch from power frequency to frequency conversion without impact, preventing pipeline impact, avoiding pipeline pressure exceeding the limit, and preventing pipeline rupture.
4. Networking function: Using fully Chinese industrial control configuration software, real-time monitoring of various stations, such as motor voltage, current, operating frequency, pipe network pressure, and flow rate. And it can accumulate the electricity consumption of each station, accumulate the liquid output of each pump, and provide various forms of printed reports for analysis and statistics.
5. Flexible control: manually select the working mode.
6. Complete self-protection function: If a pump malfunctions, it will actively send an alarm message to the upper computer and start the backup pump to maintain water supply balance. In case of a malfunction in the self-control system, users can directly operate the manual system to protect the water supply.
Application of fans
Traditional flow design is based on the maximum air volume requirement, and its adjustment methods are controlled by baffles, air doors, reflux, start stop, etc., which cannot form a closed-loop control and do not consider energy-saving factors. The electrical control adopts direct or step-down starting, which has a significant impact on the mechanical and electrical control components of the equipment, resulting in a short lifespan of the transmission system, high vibration and noise, a large required power supply (grid) capacity, and low power factor, which are the main problems. Using a frequency converter to retrofit equipment has great advantages.
The effect of using Lingke frequency converter for fan load
1. Depending on the purpose and specific performance, the energy-saving effect can reach 20% -45%. Theoretically, the investment cost can be recovered in six to eight months.
2. The drive motor can be soft started without 7 times the impulse current required for starting
3. It can infinitely adjust the speed to avoid mechanical resonance points and operating noise
4. By detecting physical quantities and inputting them into the PID port, a closed-loop automatic control system can be formed
5. Capable of detecting blockages or ruptures in pipelines
6. Soft start characteristics can extend the operating life of mechanical loads
7. Can be designed as a constant pressure control air supply system
Technical features:
The biggest feature of the INVT-P9 series frequency converter is its energy-saving and automatic control, which has corresponding application functions in handling the starting, stopping, and operating characteristics of various pump and fan loads.
1. Built in P1 function, can accept multiple given and feedback signals, and can be programmed to set analog signals;
2. Simple PLC, speedometer, and timing function to achieve one to three control of fixed frequency conversion;
3. The automatic energy-saving function detects the characteristics of negative transportation zones and adjusts the optimal output state, improving energy savings by 4-8%;
4. Light load detection alarm or shutdown to prevent motor or water pump from burning out. Equipped with fire water supply and waterproof hammer function;
5. S-shaped curve operation, rich control and operation protection functions.
Application industry:
1. Boiler drum induced draft fan, circulating water pump, make-up water pump, central air conditioning cooling water pump, chiller, fan.
2. Cement plant fans, ceramic kiln fans, water pumps, coal mine underground exhaust fans (1140V explosion-proof).
3. Water treatment plants, residential water supply, submersible pumps, and fountain applications.
4. Pumps and fans in the petrochemical, pharmaceutical, and fertilizer industries.
5. Oilfield water injection pump and oil transfer pump (widely used in 11-280KW).
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