Industrial washing machines are widely used, and frequency converters are their core components. The application of frequency converters in industrial washing machines requires high starting torque, frequent forward and reverse rotation, high current operation, and long-term operation in high-temperature and high-humidity environments, placing high demands on the performance and reliability of the frequency converters. The HD30 vector control frequency converter has been successfully applied in the industrial washing machine field, and its superior performance (high low-frequency torque, wide speed range, high steady-state accuracy, flexible and convenient operation, and comprehensive protection functions) and high reliability have been fully verified, fully meeting the control requirements of industrial washing machines.
Industrial washing machines are widely used and the inverter becomes the core component of industrial washing machines. Inverter applications in the industrial washing machine need large start torque, frequent reversible rotation, high-current run and long-term work in the hot and humid environment. Therefore high demands on the performance and reliability of the inverter are necessary. HD30 vector control inverter is successfully applied in the field of industrial washing machine and its excellent performance (low-frequency large torque, wide speed range, high steady precision, easy operation, full function protection) and high reliability have been sufficiently validated. HD30 vector control inverter totally meets the industrial washing machine control.
1 Introduction
Industrial washing machines (industrial washing machines) are suitable for washing various cotton, wool, linen, and chemical fiber blended fabrics. They are widely used in garment factories, laundries, industrial and mining enterprises, schools, hotels, hospitals, and other laundry facilities. They are ideal equipment for reducing labor intensity, improving work efficiency, and reducing energy consumption. Industrial washing machines have existed since the invention of the world's first washing machine. Just like the dramatic changes brought about by the Industrial Revolution, today's increasingly automated washing machines have transformed the way we used to wash clothes by hand. Due to confidence in traditional industries, users are now demanding higher performance from products, with stringent requirements for efficiency, process control, and product reliability. Based on the needs of downstream users, equipment suppliers are forced to keep pace with the times, continuously introducing new technologies and processes to maintain their position in the industry. Therefore, the selection of frequency converters, a key component of industrial washing machines, is particularly important.
2. Industrial Washing Machine Process Description
Industrial washing machines involve several processes: washing, even distribution, medium spin, and high spin. First, water is added, and the machine washes in both directions for XX minutes. After washing, it enters the spin-drying stage, which includes three processes: even distribution, medium spin, and high spin. Even distribution means that the washing machine rotates forward at a higher speed than the washing process for XX minutes from the water-filled and water-free stage, so that the washed clothes are evenly attached to the inside of the washing machine drum, ensuring a smooth spin-drying process. After even distribution, the speed is increased to enter the medium-speed spin-drying process, followed by the high-speed spin-drying process, which reduces the moisture content of the clothes to the required level.
3. Technical requirements for industrial washing machines
1. Load start-up and low-frequency operation. The drum speed is 10Hz during washing, requiring strong low-frequency load-carrying capacity;
2. During high-speed descrambling, the motor must not stall when the drum speed is 180Hz;
3. Frequent forward and reverse rotation during washing results in instantaneous current much greater than the motor's rated current, placing high demands on the inverter's overload capacity and the module's overcurrent capacity.
4. Able to work in humid and high-temperature environments for extended periods;
5. To improve work efficiency, rapid acceleration/deceleration is required in some situations;
4. Introduction to HD30 Vector Control Frequency Inverter
The HD30 series vector control general-purpose frequency converter is a new generation of vector control frequency converter developed by Shenzhen Haipumont Technology Co., Ltd. It features strong low-speed torque capability, high control precision, and ultra-quiet operation. Built-in features include process PID control, programmable analog curves, 16-segment multi-speed operation, programmable input/output terminals, and multi-frequency command channel design. It organically combines general needs with the personalized needs of industry users, providing a highly integrated all-in-one solution. It also boasts strong adaptability to power grids and environments, high reliability, and simple and convenient operation. Solutions are standard for high-temperature and high-humidity environments.
5. Features of HD30 Vector Inverter
The HD30 series frequency converters offer numerous targeted advantages based on the technical requirements of industrial washing machine systems:
1. It has reliable overload protection capability and can reliably output more than 150% of the rated output current for more than 2 minutes;
2. The starting torque can reach more than 180% at 0.5Hz, which meets the requirements of starting under load and high torque at low speed;
3. At least two standard analog input interfaces (AI1 voltage 0~10V, AI2 voltage/current selectable -10V~+10V/0~20mA DC).
It is compatible with most CNC system interfaces and has strong versatility.
4. Employing the latest algorithms, analog inputs exhibit high linearity and high accuracy;
5. The carrier frequency range is 1~16kHz, which effectively reduces the howling noise of the spindle system;
6. Standard configuration includes RS485 communication interface, MODBUS communication protocol, and dedicated PC debugging software;
7. Online identification of motor parameters ensures system stability and accuracy;
8. Adaptive control of grid voltage effectively avoids interference caused by voltage fluctuations;
9. Inverter input/output status monitoring greatly facilitates subsequent maintenance work for equipment suppliers.
6. Application of HD30 Vector Control Frequency Inverter in Industrial Washing Machines
The application site was a large washing equipment factory. The debugging process and results are as follows.
6.1 Debugging Process
(1) Wiring according to Figure 2;
(2) Set the motor parameters according to the motor nameplate;
(3) Disconnect the motor load and use the jog (JOG) function to determine the motor rotation direction. If necessary, change the running direction selection (F00.17) to determine the forward rotation.
(4) Set the motor parameters appropriately;
(5) Set the maximum output frequency and upper limit frequency;
(6) Set the command given channel;
(7) Set acceleration and deceleration time;
(8) Set terminal functions;
(9) Set multiple frequency commands
6.2 Functional Parameter Settings
6.3 Inverter Wiring
The inverter wiring diagram is shown below:
6.4 Debugging Results
A 100kg industrial washing machine was tested with a load increased to approximately 150kg. The production process was as follows: 1. Washing: 10Hz, rotating forward and reverse for stable operation; 2. Distributing: 20Hz; 3. Medium spin: 80Hz; 4. High spin 1: 100Hz; 5. High spin 2: 120Hz; 6. High spin 3: 140Hz; 7. High spin 4: 170Hz. The machine was then stopped smoothly.
6.5 Debugging Precautions
1. If a large starting torque is required at low frequencies, setting F09.07 to 0 for automatic torque boost will meet the requirements;
2. To improve washing efficiency, the inverter can be selected using vector control mode, and the motor parameters need to be self-tuned.
7 Conclusion
The HD30 vector control frequency converter has been successfully applied in the field of industrial washing machines. Its superior performance (high low-frequency torque, wide speed range, high steady-state accuracy, flexible and convenient operation, and comprehensive function protection) and high reliability have been fully verified, and it fully meets the control requirements of industrial washing machines.
