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I. Music Fountain Control Overview
Application of Flextronics AC60 Frequency Converter in Musical Fountain
The musical fountain can perfectly combine the spirituality of water, the beauty of music and the color of light, giving people a pleasing sensation. Today, larger fountains, such as those set up in city squares, are no longer simply controlled using a few buttons or some logic switches to satisfy the viewer’s ever-increasing level of appreciation. With the development of social economy and technology and the improvement of cultural and artistic quality of life, people have also put forward higher requirements for the technical content and artistic effects of the fountain. Therefore, the frequency converter plays an extremely important role in achieving specific artistic effects in the musical fountain. The important role.
The music fountain system has a large number of electromagnetic valves, lanterns, pumps, and motors that produce other mechanical actions. Some of the variable frequency water pumps need to use analog signals to continuously adjust the height of the water column to achieve specific artistic effects. Some components are controlled by switches. These switch signals drive valves, lanterns, and water pumps to perform different combinations with music, resulting in a variety of Water shape and light transformation effects. In order to achieve the harmony of hearing and vision, the control system should be able to output according to the rhythm, melody and emotional color of the music, resulting in a variety of different combinations of states to match the real-time changes in water and light.
The basic path to form a water shape consists of pumps, pipes, valves and nozzles. There are different control methods for different water shapes. From the control of the fountain can be basically divided into four categories:
The first type is to start the water pump directly to pressurize the pipeline and the sprinkler head. The effect is that the water column of the sprinkler head has a transitional lifting process when starting and stopping.
The second kind, need to control the water pump speed through the frequency changer to realize the water column continuous lifting effect.
The third category is to start the drive motor to control the oscillating of the nozzle during the pressurized water jet to achieve a pattern change.
In the fourth category, it is necessary to quickly control the opening and closing of a large number of electromagnetic valves through the controller after the water pump is directly started to pressurize the pipeline, so that the nozzles are fired in various ways to form the so-called “running spring†and “jumping spring†effects. .
Second, the composition of the control system
In larger fountains, there are generally hundreds of control points, and some square fountains can reach hundreds or even thousands of controlled points. Therefore, a modular hierarchical control system can be used to complete the control of the system.
The general musical fountain system consists of an industrial control computer, a switch board and a running spring to form a three-level control structure. The upper computer of the first level of the system is the core of this control system. Due to the large electromagnetic interference in the site and the harsh environment for use, the host computer needs to adopt a standard IPC. The task of the upper computer is to realize the human-computer interaction interface, store music files, read in and analyze the audio signals, operate the lower-level output module, and control the start-stop of the entire system. In order to achieve the above functions, the system is designed to divide a large number of controlled objects into four types of modules according to different load types:
(1) Music recognition and processing module. It consists of an analog acquisition board and a sound source processing circuit. (2) Variable frequency water pump control module. Consists of D/A output board and frequency converter. (3) The switch control module. For lanterns, pumps, and drive motors, this is the largest number of modules. (4) Graded control running spring module.
Third, the application of Flextronics AC60 series inverter
According to the above, one type of water shape needs to control the rotation speed of the water pump by the frequency converter to achieve an artistic effect such as continuous lifting and lowering of the water column. This part is the core technology of the musical fountain. There are several sources of external audio signals that control the fountain, one of which is the sound source output from the sound system. The signal is amplified, filtered, clipped, and detected by the conversion circuit, and the envelop detection signal proportional to the logarithm of the music amplitude is sent to the acquisition card. The amplitude of the signal is 0 to 10V and is based on a large number of music audio signals. Analysis of statistics, given a judgment basis and the corresponding threshold, so you can achieve the water shape follow the music melody changes.
Its control circuit diagram is as follows:
IV. Features of Flextronics AC60 Series Inverter
· The ±15% fluctuation range of the rated voltage is allowed to adapt to the current situation of China's power grid;
Input and output three-phase voltage: 220V, 380V, 660V, 1140V; Output frequency range: 0-400Hz adjustable;
· Optimized SVPWM control technology: smooth output current waveform, strong ability to suppress current, stable operation when the load is fluctuating over a wide range;
· Perfect mute control, 15kHz online adjustable to ensure reasonable torque output, while effectively reducing motor noise and heat;
· Perfect motor protection, with overload, overcurrent, overvoltage, undervoltage, short circuit and other protection and soft start, soft stop function;
· Rich programmable input and output terminals, two programmable analog input ports, and can be switched to each other, combined with rich software logic functions, to meet the application requirements of different industries;
General-purpose built-in DC reactor with more than 160kW, high input power factor reduces the interference of high-power machines to the power grid;
· With perfect software and hardware protection features.
Flextronics AC60 series inverters have been successfully applied in the music fountain field. The results show that: The inverter is stable in operation, safe and reliable, and the control accuracy and other technical performance can meet the actual requirements, and the cost is low, the use of simple and convenient, the effect is very satisfactory.