Siemens M430 inverters need to do constant current control, such as 90KW motor, which needs to work at 150A constant. Can you tell me how to achieve this? A: According to the function diagram of MM430, MM430 does not have constant current control function, he only has the maximum current limiting function. Therefore, in order to achieve constant current control, the MM430 has no play. The MM440 inverter must be used, and any adjustable, continuous and stable constant current control can be realized by vector control.
Of course, if you are familiar with the control mode of the MM430 and the control theory of the inverter. It is not necessary to use MM430 to achieve constant current control. That is the so-called "expert setup application". More complicated, this will not be repeated.
At the prompt, the principle is to set a corresponding voltage for different operating frequencies according to the mathematical model of the motor to make it meet the constant current output. Here we need to model the specific motor, set different frequency given and different voltage reference at different operating frequencies. To achieve the constant current characteristics of its control.
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