Application of FRENIC5000G11S inverter in music fountain control system

With the development of social and economic strength, the progress of science and technology, the innovation of aesthetic thinking and the improvement of people's urbanized lifestyle, music fountains, as a kind of urban landscape, have been widely included in the agenda of modern urban construction with their sound-patterned and highly infectious urban waterscape projects. The urban music fountain waterscape project brings people a pleasing visual and auditory feast, which can bring spiritual freshness and pleasure to modern people who are nervous, busy and under great pressure. In this kind of waterscape engineering system, the main reason why the water type of the music fountain can dance with the music is the control function of the frequency converter.

1 Composition of the music fountain control system

The music fountain control system in the urban waterscape project introduced in this article is mainly composed of computers (industrial control computers, PLCs, etc.), music signal processing systems, intermediate relays, frequency converters, and actuators. Figure 1 shows the structural block diagram of the urban music fountain control system.


2 Control principle of music fountain

In today's city squares and other urban landscapes. Music fountains have been widely used, and the working methods of urban music fountains can be roughly divided into two methods. The first is to store the music signal in the computer system, and then process the music signal through the software program, and then output the music signal to the music signal processing system. Then the frequency converter obtains the voltage signal from the music signal processing system and outputs different frequencies according to the size of the voltage signal. After these different frequency signals act on the motor of the water pump or the swing system, the water output of the water pump can be adjusted and the height of the water column can be controlled to achieve the effect of the water shape changing with the change of the music signal;

the second is to directly act the music source on the frequency converter through the music signal processing system to achieve the control effect of the music fountain.

3 Function settings of frequency converters

Frequency converters of different manufacturers and models generally have different functions. Fuji FRENIC5000G11S is taken as an example to briefly explain. The frequency converter has multiple function setting methods such as F01~47, C01~33, P01~09, H03~39, A01~18, U01~61, etc. Most of these functions can be selected in the factory default state. The following is a detailed introduction to some functions that need to be reset when used.

F02: indicates the running status. If it is set to 1, the inverter can be in automatic working state.

F07: indicates the acceleration time. If

it is set to 0.2~0.8, the fountain water column can rise softly. F08: indicates the deceleration time. If it is set to 0.2~0.8, the fountain water column can fall softly.

F15: indicates the upper limit frequency. If it is set to 50, the inverter output frequency can be limited to 50 Hz to protect the water pump or motor.

F16: indicates the lower limit frequency. If it is set to above 15, it can ensure that when there is no music signal, the fountain has a certain height of water column.

E45: indicates LED monitoring selection. If it is set to 1, the working status of the music fountain system can be monitored through the display screen of the inverter.

C05~C07: It is a multi-step frequency setting. C05~07 can be used to make the fountain gradually superimposed, which can be used for chasing fountains or high water column fountains to give people a visual impact. Usually C05 can be set to 15, C06 can be set to 30, and C07 can be set to 50;

P01: Indicates the state of motor 1. When the load is a submersible pump, it can be set to 2, and when the load is a reducer, it can be set to 4.

4 Connection of the inverter

During design, the power input terminals L1, L2, and L3 of the inverter can be directly connected to the output terminals of the air switch in the control cabinet, and the U, V, and W of the inverter can be output to the water pump or swing motor. At the same time, the signal input terminals 11, 12, and 13 of the inverter can be connected to the output terminals of the music signal processing system respectively. And connect the X1, X2, and X3 of the inverter to the normally open contacts of the intermediate relay. In this way, the water column type of the music fountain can be controlled under the control of the PLC, single-chip microcomputer or industrial computer through the relay. The specific connection is shown in Figure 2.



5 Conclusion

Through the above circuit connection and function setting, in the music fountain control system, the frequency converter can be used to control the strength of the music signal, and the strength change of this music signal can be perfectly reflected in the height of the fountain water shape and the speed of the water shape swing, thus giving people a beautiful enjoyment.