1. The inverter runs with the motor at no load
1. To set the power and number of poles of the motor, the operating current of the inverter should be considered.
2. Set the maximum output frequency, fundamental frequency, and torque characteristics of the inverter. The general inverter is equipped with a number of VPf curves for users to choose, and users should select the appropriate VPf curves according to the nature of the load when using. 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 when the inverter is started, so that the torque output 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 asynchronous motor, the control of torque is more chaotic. In the low frequency band, because the influence of resistance and leakage reactance cannot be ignored, if VPf is still constant, the magnetic flux will be reduced, and then the output torque of the motor will be reduced. For this purpose, the voltage is appropriately compensated in the low frequency bands to increase 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 run key and stop button, and check whether the motor can start and stop normally.
4. Be familiar with the maintenance code when the inverter runs faulty, investigate the factory value of the thermal maintenance relay, investigate the set value of overload maintenance, and be able to correct it when needed. 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 maintenance of the inverter will cut off the output of the inverter. Therefore, the maximum threshold of the inverter's electronic thermal relay does not exceed the maximum allowable output current of the inverter.
2. Test run with load
1. Manually operate the operation stop button of the inverter panel, investigate the operation abort process of the motor and the display window of the inverter to see if there is any abnormal phenomenon.
2. If the inverter presents an overcurrent maintenance action during the process of starting P to abort the motor, the deceleration time of P should be set from the beginning to speed up. The acceleration of the motor during acceleration and deceleration depends on the acceleration torque, while the frequency change rate of the inverter during the start-up and braking process is set by the user.
If the moment of inertia of the motor or the load of the motor changes, when the speed is increased or decelerated according to the preset frequency change rate, it may not be possible to accelerate the torque, and then the motor stall will be formed, that is, the motor speed is not in harmony with the output frequency of the inverter, and then the overcurrent or overvoltage will be formed. Therefore, the acceleration and deceleration time should be reasonably set according to the moment of inertia and load of the motor, so that the frequency change rate of the inverter can be harmonized with the speed change rate of the motor.
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