Fountain is a dynamic art landscape. In recent years, with the improvement and upgrading of urban construction, fountain art has achieved unprecedented development. Many fountain projects have been built successively all over the country, especially in public places for residents' leisure and entertainment such as parks and tourist attractions. They not only play a role in beautifying the environment and heightening the atmosphere, but also have the functions of adjusting the climate and attracting tourists to watch, and are generally loved by people. This article mainly introduces the composition of the music fountain system, the application of the frequency converter in the music fountain control system, and the application requirements of the music fountain for the VFD.
The use of VFDs in waterscape fountains was originally to avoid the bluntness of water-shaped movements; later, the output frequency based on VFDs can be adjusted steplessly, so that the height of the water column of the fountain fluctuates with the level of music. In today's waterscapes, frequency converters are more widely used, especially in large-scale musical fountains. A frequency conversion matrix may use hundreds of VFDs to form one after another and ever-changing water body shapes.
The water pump is an inductive load, the impact current of direct start is very large, generally 5-6 times of the working current, and the starting current can be greatly reduced by using a VFD, so that the current increases steadily to the working current, saving energy consumption after only one start More than 80%.
The electric motor controlled by VDS has good dynamic and static performance. Since the VFD itself is a device for motor speed regulation, controlling the speed of the motor is its basic function. The starting process can be controlled arbitrarily. In theory, any starting speed curve can be set artificially, which is not available in other methods.
The positive and negative rotation of the electric motor is easy to realize in the frequency conversion speed regulation. Moreover, by changing the switching sequence of the inverter tube inside the VFD, the output commutation can be realized, and the motor burnout problem caused by improper commutation can be avoided.