The inverter motor runs at no load, and the power and the number of poles of the variable frequency motor are set. The operating current of the inverter should be considered comprehensively.
Set the maximum output frequency, fundamental frequency, and set torque characteristics of the inverter. The general-purpose inverters are equipped with multiple VPf curves for the user to select. The user should select the appropriate VPf curve according to the nature of the load. In the case of fan and pump loads, set the torque running code of the frequency converter to variable torque and torque reduction operating characteristics. In order to improve the low-speed performance of the inverter when starting, the torque output from the motor can meet the requirements of the production load start-up, and the starting torque should be adjusted. In the asynchronous motor variable frequency speed control system, the torque control is more complicated. In the low frequency band, since the influence of resistance and leakage reactance cannot be ignored, if the VPf is kept constant, the magnetic flux will decrease, thereby reducing the output torque of the motor. For this reason, the voltage is appropriately compensated at the low frequency band to increase the torque. Generally, the inverter is manually compensated by the user.
Set the inverter to its own keyboard operation mode, press the run key and stop key to observe whether the motor can start and stop normally.
Be familiar with the protection code when the inverter runs fault, observe the factory value of the thermal protection relay, observe the setting value of the overload protection, and modify it if necessary. The user of the inverter can set the electronic thermal relay function of the inverter according to the instruction manual of the inverter. When the output current of the inverter exceeds its allowable current, the overcurrent protection of the inverter will cut off the output of the inverter. Therefore, the maximum threshold of the inverter electronic thermal relay does not exceed the maximum allowable output current of the inverter.
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