1. No-load energizing test of inverter
1. Ground the grounding terminal of the inverter.
2. Connect the power input terminal of the inverter to the power supply through the leakage maintenance switch.
3. Check whether the factory display window of the inverter is normal, if it is incorrect, it should be reset, otherwise it will be returned.
4. Be familiar with the operation keys of the inverter. The general inverter has 6 buttons, such as RUN, STOP, PROG, DATAPENTER, UP and ▲, and DOWN. In addition, some inverters also have function keys such as MONITORPDISPLAY, RESET, JOG, and SHIFT.
2. The inverter runs with motor without load
1. To set the power and number of poles of the motor, the operating current of the inverter should be comprehensively 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 choose 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 production load starting, the starting torque should be adjusted. In the frequency conversion speed regulation system of asynchronous motor, the control of torque is more complicated. In the low frequency band, due to the influence of resistance and leakage reactance, if VPf is still maintained, the magnetic flux will be reduced, and the output torque of the motor will be reduced. For this reason, the voltage is appropriately 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 built-in keyboard operation form, press the run key and stop button, and check whether the motor can start and stop normally.
4. Familiar with the maintenance code when the inverter runs faulty, investigate the factory value of the thermal maintenance relay, investigate the setting value of overload maintenance, and correct it when necessary. The operator of the inverter can set the electronic thermal relay function of the inverter according to the operating 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.
3. Test run with load
1. Manually operate the operation stop button of the inverter panel, investigate the operation stop 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 the P abort motor, the deceleration time of P should be set from the beginning. 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 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 accelerate the torque enough, and then form a motor stall, that is, the motor speed is not coordinated with the output frequency of the inverter, and then overcurrent or overvoltage is formed. Therefore, it is necessary to reasonably set the acceleration and deceleration time according to the moment of inertia and load of the motor, so that the frequency change rate of the inverter can be coordinated with the speed change rate of the motor.
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