When PLC controls the frequency converter, it is often encountered that the frequency needs to be frequently modified. The only choice is to use PLC communication to set the frequency, and use the digital output Q point to control the frequency converter to start and stop forward and reverse, so as to realize PLC automatic control.
Here we take CPUST30 and V20 inverters as examples to explain.
The hardware connection is shown in the figure below:
So how to set the parameters for the inverter?
Before debugging the parameters, restore the factory default value of the inverter, the method is as follows:
V20 sets the parameter access level P0003, you need to change the level to expert to access all application parameters, the method is as follows:
Set the start-stop command source to external terminal control P0700, the method is as follows:
Set the functions of the external input terminals P0701 to P0704, the method is as follows:
Set the control line type P0727, the method is as follows:
To set the frequency setting and select P1000, the method is as follows:
Also set the inverter communication related parameters,
After setting the parameters, the next step is to write the program as follows:
After reading this article, I believe that I have some understanding of the V20 inverter communication application, and other control procedures can be completed by themselves according to the control requirements.
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