【Daily Question 20090309】Parameter Setting of Inverters (III)?
Thread Content
【Daily Question 20090309】Parameter setting of inverters: Why is it necessary to enter the motor’s rated voltage? Summary: At full frequency, the output voltage of an inverter is generally equal to the motor’s rated voltage. That is, the upper limit of the voltage in the volt-frequency characteristic is the rated voltage of the motor. This post was last edited by lihy on 2009-3-9 20:25]
Inverter power inputs usually have overvoltage protection, but if high voltage is applied to the input for an extended period of time, it can damage the inverter’s input circuit. Therefore, in practical use, it is necessary to verify the input voltage of the inverter (single-phase or three-phase) as well as the rated voltage for which the inverter is designed. Especially when the power supply voltage is extremely unstable, a voltage stabilizing device is necessary; otherwise, serious consequences will occur.
Among the parameter input items for the inverter, there are some that relate to the basic parameters of the motor, such as the motor’s power, rated voltage, rated current, rated speed, number of poles, etc. The entry of these parameters is very important, as it directly affects the proper functioning of certain protection functions in the inverter. It is essential to enter the values correctly based on the actual parameters of the motor, in order to ensure the proper operation of the inverter
Automatic motor parameter tuning: When vector control mode is selected, it is necessary to enter the motor’s nameplate parameters accurately before the inverter starts operating; the inverter then uses these parameters to set the standard motor settings； The vector control method is highly dependent on motor parameters. To achieve good control performance, it is necessary to obtain accurate parameters of the motor under control, and the motor parameters need to be tuned.
Typically, before setting the control parameters of the inverter, it is necessary to first set the motor parameters and perform motor self-tuning to ensure better control performance. Motor parameters refer to the rated voltage, rated frequency, rated current, rated speed, etc., indicated on the motor’s nameplate. For vector-controlled variable frequency speed control systems, the performance of such systems depends on the accuracy of field orientation, and the accuracy of field orientation in turn depends on the accuracy of the motor parameters. Motor voltage is one of the important parameters of a motor.
It is mainly used to provide parameters for overvoltage and undervoltage protection