The following four steps are very important for the commissioning of the inverter with the machine (i.e., connected to the motor) and no-load (i.e., the motor without load).
(1) Set the power of the motor, the number of pole pairs, and determine the working current of the inverter.
(2) Set the maximum output frequency and base frequency of the inverter and set the torque characteristics of the motor. The choice of voltage/frequency (V/F) operating mode includes items such as the highest operating frequency, the basic operating frequency (i.e., the base frequency), and the torque type.
The highest frequency refers to the highest frequency that the inverter motor system can run, because the maximum working frequency of the inverter itself may be relatively high, when the maximum allowable working frequency of the motor is lower than the maximum working frequency of the inverter, the frequency of the working should be set according to the requirements of the motor and its load.
The basic working frequency of the inverter refers to the dividing line between the constant power control and constant torque control of the motor by the inverter, which should be set according to the rated voltage of the motor. Whereas, the torque type refers to whether the load is a constant torque load or a variable torque load.
In the process of installation and commissioning, the user can choose one of the working modes according to the V/F working mode diagram and load characteristics in the inverter instruction manual. The general inverter is equipped with a number of V/F curves for users to choose, and the appropriate V/F curve should be selected according to the load nature.
However, in the case of fan and pump loads, the torque operation code of the inverter should be set to the variable torque and reduced torque operation characteristics. In order to improve the low-speed performance of the inverter when starting, so that the output torque of the motor can meet the starting requirements of the production load, the starting torque should be adjusted. In the frequency conversion speed regulation system of three-phase asynchronous motor, the control of rotation distance is more complicated. In the low frequency band, since the effects of resistance and leakage reactance cannot be ignored, if the v/f is still constant, the magnetic flux will be reduced, and the output torque of the motor will be reduced. Therefore, in the low frequency band, the voltage should be properly compensated to increase the torque. Generally, the inverter is manually set and compensated by the user.
(3) Set the inverter to the built-in keyboard operation mode, press the stop button and the run button respectively to observe whether the motor can stop and start normally.
(4) Set the function of the electronic thermal relay in the inverter according to the introduction in the instruction manual of the inverter.
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