Three methods - PLC control frequency converter

PLC controller to control frequency converter, generally there are three kinds of methods.

1, terminal control mode, which is more broken rate. Frequency converter can set the specific function of each terminal, such as start stop, positive &negative, multistage speed and so on. We can pass the output of the PLC to control frequency converter of each terminal, in order to achieve the requirements of control frequency converter.

2, analog control mode, such as the classic example of constant pressure water supply. PLC by AD module ( Analog input) And the pressure inside the hydraulic pressure gauge acquisition tap water pipeline, and then through the PID algorithm, using DA module ( Analog output) Control the frequency converter. When peak water, the water pressure decreases, PLC will be through the pid algorithm increase the output of the DA module, and also is to increase the frequency of the inverter, prompting the pressure inside the pipeline. To ensure that the water pressure constant.

3, communication control, basic is the modbus communication protocol of frequency converter, through the communication, PLC as the master station, frequency converter as from the station. In theory, a PLC can control the 32 biggest inverter. And wiring is simple, maintenance is convenient. In addition to control frequency converter, still can read a series of operation parameters of frequency converter, fault code, etc. A method of communication control is applied more widely.

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