Application of FRENIC5000G11S frequency converter in music fountain control system
0 Preface
With the development of social and economic strength, the advancement of science and technology, the innovation of aesthetic thinking, and the improvement of people's urbanized lifestyles, musical fountains, as a kind of urban landscape, have a wide range of infectious urban waterscape projects with accompanying sound patterns. The agenda for the construction of modern cities. The urban music fountain waterscape project brings people a pleasing audio-visual feast, which can bring freshness and joy to the minds of 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 to rely on the control function of the frequency converter.
1 Composition of music fountain control system
The music fountain control system in the urban waterscape project introduced in this article is mainly composed of a computer (industrial control computer, PLC, etc.), a music signal processing system, an intermediate relay, a frequency converter, and an execution mechanism. Figure 1 shows the block diagram of the composition of the urban music fountain control system. 
2 Control principle of musical fountain
In the current city square and other urban landscapes. Music fountains have been widely used, and the working methods of urban music fountains can be roughly divided into two ways. 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, and then obtain the voltage signal from the music signal processing system by the inverter, and according to The size of the voltage signal outputs different frequencies. After these different frequency signals act on the pump or the motor of the swing system, the water shape can be adjusted by adjusting the output of the pump and controlling the height of the water column to change the height of the water shape with the change of the music signal. Effect;
The second is to directly apply the music source to the frequency converter through the music signal processing system, so as to achieve the control effect of the music fountain.
3 Function settings of the inverter
Frequency converters of different manufacturers and different models generally have different functions. Let us take Fuji FRENIC5000G11S as an example to briefly explain. The inverter has various function setting methods such as F01 ～ 47, C01 ～ 33, P01 ～ 09, H03 ～ 39, A01 ～ 18, U01 ～ 61 and so on. Most of these functions can be selected from the factory default state, the following will introduce some functions that need to be reset during use.
F02: indicates the running state, set to l can make the inverter in automatic working state;
F07: indicates the acceleration time, set to 0.2 ~ 0.8 can make the fountain water column rise gently;
F08: indicates the deceleration time, set to 0.2 ~ 0.8 can make the fountain water column fall softly;
F15: indicates the upper limit frequency, set to 50 to limit the maximum output frequency of the inverter to 50 Hz to protect the water pump or motor;
F16: indicates the lower limit frequency, set above 15 to ensure that there is a certain height of water column in the fountain when there is no music signal;
E45: indicates LED monitoring selection, set to 1 to monitor the working status of the music fountain system through the inverter display;
C05 ～ C07: Multi-step frequency setting. With C05 ～ 07, the fountain can be gradually superimposed, which can be used to chase the spring or high water column fountain, giving a visual impact effect. Usually C05 can be set to 15, C06 can be set to 30, C07 can be set to 50;
P01: indicates the state of the motor 1. When the load is a submersible pump, it can be set to 2, when the load is a reducer, it can be set to 4.
4 Inverter connection
During design, the power input terminals L1, L2, L3 of the inverter can be directly connected to the output terminal of the air switch in the control cabinet, and the U, V, W of the inverter can be output to the water pump or swing motor, and the inverter The signal input terminals 11, 12, 13 are respectively connected to the output terminals of the music signal processing system. And connect the X1, X2, X3 of the inverter to the normally open contact of the intermediate relay, so that the water column water type of the music fountain can be controlled by the relay under the control of PLC, single chip or industrial computer. The specific connection is shown in Figure 2. 
5 Conclusion
Through the above circuit connection and function settings, in the music fountain control system, the strength of the music signal can be controlled by the frequency converter, and the change of the strength and weakness of this music signal is perfectly reflected in the water level of the fountain and the water type swing The speed is fast, so as to give people the enjoyment of beauty.
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