In urban construction and planning, people put forward higher requirements on construction of leisure places, all kinds of leisure square, the construction of the park is becoming more and more beautification, the music fountain system to sound, light, water, and unique color combination effect becomes an important part of city landscape construction, domestic large and medium sized cities have rushed to the construction of music fountain, and the small cities development. At present, many squares or parks also use music fountain beautiful design, all kinds of patterns of fountains, colorful lights and beautiful music to form a pleasant night scene and attract people, so that the music fountain system is increasingly promoted and applied.

The general music fountain system mainly consists of audio control system, fountain control system and light control system. The audio control system is mainly composed of music player, preamplifier, power amplifier, listening speaker and sound column.

Fountain system is mainly composed of controller, inverter, fountain pumps, multifunctional valve, universal nozzle and water supply network, the fountain pump has adopt frequency control of motor speed technology, realizes stepless speed regulating of water pump, can at any time according to the strength of the audio signal to adjust pump speed, multifunction valve and universal nozzle is controlled by a fountain special controller, can achieve all sorts of design and shape according to set procedures. The system is shown in the figure below.

Music fountain control system sets the audio control technology, process control technology and intelligent control technology in the integration of control systems, belongs to a kind of industrial field control system, its upper machine mostly adopts the multimedia industry PC unit, which can realize the real-time programmable, can according to the strength of the music melody, rhythm and audio degree fountain control system, its electric control system mainly has the following three forms:

(1) centralized control

The centralized control system adopts the radiative structure, which can satisfy the music fountain with smaller scale and less change of pattern.

(2) fieldbus control

Fieldbus is a kind of serial data communication link, which realizes the connection between basic control equipment in fountain field and superior control equipment, such as rs-485 bus and CAN bus. Digital communication technology, strong anti-interference, high precision; The control functions are distributed to the fountain site, which improves the reliability and flexibility of the electronic control system.

(3) network fieldbus control

The structure of network fieldbus is similar to that of fieldbus, and its performance is better than that of the latter. The network fieldbus belongs to a distributed control system. The electronic control system runs faster, meets the requirements of real-time control of music fountain, and has better stability. There are many types of network connection structure, which can support bus and radial type at the same time. The main difference between fieldbus and fieldbus is that the former USES the special network operating system to realize the interoperation of each device on the network.

(4) in addition, the music fountain system includes the lighting control system, which will not be described in detail here. It can be seen from the above that the music fountain control system is a complex on-site control system integrating sound, light and electricity.

Anbang xin AMB600 fountain special controller introduction:

Fountain controller chooses reform.the AMB600 fountain dedicated controller, it has 32 relay signal output, 1 road 4 ~ 20 ma output current, and the RS - 485 communication circuit, according to the music signal is 0 ~ 20 ma signal control frequency converter, at the same time, according to whether fountain control program to control frequency converter in the automatic mode (PLC), when the X6 closed inverter run by PLC, disconnected by the external multistage speed operation, the external terminals running frequency converter has the priority, when X1 to X3 closed by multistage speed setting speed, when X7 terminal closure, The running frequency of the inverter is given by the external voltage signal 0 ~ 10V, and the fountain controller outputs the corresponding signal to control the inverter according to the program Settings.

It is known from the working principle of the frequency converter that when the frequency converter runs, its input and output side will produce high harmonics, which will interfere with other devices through conduction, radiation and coupling.

The harmonic interference signals in the music fountain system will be amplified by the audio amplification system to form a harsh noise and affect the music playing. The following measures can be taken when debugging: reduce the carrier frequency of frequency converter; The inverter is reliably grounded, and the grounding wire should be a thick wire, and the distance between the connection point and the inverter should be as short as possible. The input and output power lines of the converter should be kept as far away as possible from the audio signal line and control line. The power supply of the audio signal amplifier system is isolated from the inverter power supply as far as possible.

Frequency converter jump protection problem

Fountain pump should be along with the strength of the audio signal at any time to adjust speed, which requires the transducer response speed, frequency converter selection should be noticed in the system debugging and parameter adjustment, usually one music fountain control frequency converter for more water pump, in use should first ensure the function of the frequency converter is greater than the water pump function is combined, and set aside at least 10% margin, in terms of frequency inverter parameter setting, deceleration time as far as possible short of frequency converter, but add and subtract time is too short to appear over current protection, should pay special attention to when debugging, at present most of frequency converter fault since the recovery function, in the debug this feature can be opened, In order to avoid the wrong signal caused by the inverter alarm stop.

With the constant promotion of fountain system, the fountain control technology is also constantly improve and improve, now has expanded from the early simple fountain control to set acoustic technology, program-controlled technology and computer control technology in the integration of field control network, application of frequency control technology in the fountain system is gradually mature, and become the main mode of the water pump speed, practice proved that fountain system controlled by inverter control on the one hand, improve the system flexibility, on the other hand pump adopts frequency control of motor speed have energy-saving effect, thus music fountain frequency control of motor speed technology is worth further promotion and application.