(1) Set the power of the motor, the number of pole pairs, and check the operating 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 selection of the voltage/frequency (V/F) operation method 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 operating frequency of the inverter itself may be relatively high, when the maximum operating frequency of the motor is lower than the maximum operating frequency of the inverter, the frequency of the operation should be set according to the requirements of the motor and its load.
The basic operating 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. 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 select one of the operation modes according to the V/F operation 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 function of the inverter when starting, so that the output torque of the motor can meet the 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 the rotation distance is more complicated. In the low frequency band, because the influence 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, the voltage should be properly compensated in the low frequency band to increase the torque. Generally, the inverter is manually set and compensated by the user.
(3) Set the inverter to the operation form of the built-in keyboard, press the stop button and the run button respectively to investigate 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.
Because the threshold value of an electronic thermal relay is defined as the ratio of the rated current of the motor and the frequency converter, it is often expressed as a percentage. When the output current of the inverter exceeds its allowable current, the overcurrent maintenance equipment will block the output of the inverter.
Therefore, the maximum threshold value of the inverter's electronic thermal relay cannot exceed the maximum allowable output current of the inverter. It is also important to note that the overload maintenance setting of the inverter can also be modified.
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