- Introducing air compressors
- An air compressor is a type of device that uses a motor and a compression chamber to compress air and bring it to a certain pressure. As a basic industrial equipment, air compressors have been widely used in most industrial fields such as metallurgy, machine manufacturing, mines, electricity, textiles, petrochemicals, light textiles, etc. The electrical energy consumed by air compressors accounts for 15%. of all large-scale industrial equipment (fans, pumps, boilers, air compressors, etc.). Most air compressors have obvious inherent technical weaknesses due to their construction and operating principles. When the output pressure exceeds a certain value, it will automatically open the exhaust valve and idle the engine. This causes a serious waste of energy. Furthermore, the motor tends to start and stop frequently. This affects the life of the engine. Star-delta starting compressors have high starting currents, which greatly affects the power grid and causes serious motor shaft wear and high equipment maintenance costs. Harsh working conditions and high noise levels. Low level of automation. Output pressure regulation is done by manually adjusting the valve opening. This has the disadvantage of low regulation speed, large fluctuations, low stability and accuracy.
- System introduction: As a Chinese inverter manufacturer, Micno inverter With competitive prices that are very suitable for the application, Micno products have safety protection functions, are easy to install and protect against overvoltage, overload and other common errors.
- The inverter control system includes the KE300A inverter, pressure sensor and other peripheral devices.
- KE300A applies vector control technology to meet the requirement of high torque when running at low frequency.
- The system uses PID control, the entire control process is as follows: Compressed air demand increases ↑ —— Compressed air pressure on the pipeline decreases ↓ —— The difference between the pressure setting value and the pressure feedback value increases ↑ —— PID output increases ↑ —— Inverter output frequency increases ↑ —— Air compressor motor speed increases ↑ —— Supply air flow increases ↑ —— Pipeline gas pressure is stable; and vice versa for the case of reduced demand.
- The 0 ~ 10V (or 4 ~ 20mA) signal provided by the pressure sensor is used as a reference value for the PID, which is connected to the analog input (AI) of the KE300A.
- Start and stop signals are given by the central control system, KE300A can provide analog output signals through the AO, then connect to the central control system to monitor pressure fluctuations.
- In case of failure of external devices, we can run the fixed frequency manually to ensure continuous production.
Control diagram of air compressor using Micno's KE300A inverter
Connection diagram on KE300A inverter
- Advantages of using KE300A inverter for air compressors
Compared with the traditional air compressor speed control system, the KE300A series inverter is integrated with a professional intelligent control algorithm to achieve dynamic matching of air supply pressure and air compressor speed.
Some features of KE300A:
- Save more energy:
Automatically optimizes output power consumption based on the air compressor's output pressure value. Reduce the actual output power of the motor to save energy.
- Quick response:
Adjusts quickly according to the machine's compressed air consumption.
- More stable:
KE300A responds to low frequencies, plus a large power range, can completely meet the requirements
torque when running at low frequency. So it's definitely suitable for "heavy load boots".
Excellent soft start and soft stop features. The start and stop time of KE300A inverter can be adjusted randomly (0 ~ 10 minutes), which means acceleration when starting and deceleration when stopping can be adjusted randomly, meanwhile, you can match the ACC/DEC timing S curve for smooth starting, which can minimize the impact of air compressor caused by starting and stopping, which is difficult to achieve by other actuators.
- Continuous operation
The automatic error clearing and power reset function ensures system continuity and does not affect production.
- Maintenance costs:
Reduce air compressor speed, reduce air compressor wear, can prolong the life of air compressor. Meanwhile, air compressor oil leakage is greatly reduced, relieving environmental pollution pressure.
- Operating conditions:
Reducing oil temperature is a good solution for the lack of reduced working pressure of air compressors in high temperature environments.
Reducing noise during operation provides a working environment that ensures factors that affect workers' health.
With a wide power range from 4.0KW to 220KW, TE300A meets all customer needs.
Contact:
- PHONE : + 84 28 3620 4172
- HPHONE :0909790869
- Roland Lim (Director): 090.8888. 733 – roland@airvacuum.com.vn