ABSTRACT
In recent years， music fountain is the emergence of a garden building combined
with a fancy watch a product, its collection of sound, light, color, shape, and
generates kaleidoscope waterscape 。 Along with the rapid development of the
programmable controller, music fountain is becoming more and higher to the
requirement of control system; make more and more need to use PLC to realize
control part。
This topic combined with the requirements of the specification, with music
fountain as the research object; adopt Mitsubishi PLC as the controller of the
fountain model。 Design of the control method has two kinds： one is fixed program
operation mode. According to design a good steps in advance step by step,
execution cycles. Another way of control is through the music fountain control.
By PLC interrupt program audio signal collection and play music, audio signal of
PLC to standardize algorithm， the algorithm of data into analog and output by analog
output to control the output frequency of frequency converter， so as to control water
pump speed， to control the fountain water column height to follow music strength
changes.
The design of music fountain control system’s overall function is analyzed，
and the programmable control technology, the application of variable frequency
control technology， the development trends are briefly introduced, as well as the
music fountain control overall design, the overall design of the electric system
and PLC program design and parameter setting of inverter。 This design improves the
music fountain system control quality; improve the stability of music fountain
control system.
KEY WORDS： Musical fountain，Control system，PLC，frequency
