In modern industry, the application of frequency converter is becoming more and more important. As the key equipment to control the speed and operation of motor, it plays an indispensable role in many fields. However, before it is put into use, it is very important to debug the frequency converter to ensure its normal operation and stability. Inverter commissioning is usually completed in the following three steps, as follows:
1. Carry out the no-load test run of the inverter first
First check whether all the wiring of the inverter is correct, do not connect the output terminal of the inverter to the motor, and conduct a no-load test on the inverter first. Read the user manual of the inverter carefully before turning on the power, familiarize yourself with the relevant functions, settings, and operation methods, and then turn on the power on this basis.
The purpose of the no-load test run is twofold:
One is to familiarize yourself with the keyboard and related operating methods through actual operations, such as performing operations such as forward, reverse, and stop, and observe the action of the inverter and whether the temperature rise is normal.
The second is to familiarize yourself with the setting and operation methods of related functions in combination with real objects. After setting, you can try to see the action state and action process of the basic functions, such as rising and falling time settings. On this basis, look at the signal of the external terminal to see if the control action is normal, such as when the potentiometer is rotated clockwise or the frequency given current is changed, whether the output frequency of the inverter changes at the same time as the given signal.
2. No-load test run of inverter with motor
After the no-load test run of the inverter is normal, it can be connected to the motor for no-load test run. Before connecting the motor, be sure to confirm that the technical indicators of the motor are qualified.
Do not load the motor. Then let the inverter drive the motor to rotate, and observe whether it is normal, such as whether the direction of rotation of the motor meets the requirements. Turn the frequency setting potentiometer counterclockwise to 0Hz at the left end, then turn on the forward rotation switch (FWD) of the frequency converter, slowly turn the potentiometer clockwise to gradually increase the given frequency, and observe the rotation of the motor. When the maximum frequency is 50%, let the motor rotate for a few minutes, and observe the voltage and current values, then let the output frequency of the inverter reach the maximum frequency, let the motor rotate for a few minutes, and observe the voltage and current values, Then let the output frequency of the inverter reach the maximum frequency, and then let the motor rotate for a few minutes.
Then reduce the output frequency to 75% or 25% of the maximum frequency, let the motor rotate for a while, then increase the output frequency, and then turn off the forward rotation switch (FWD) to see if the motor decelerates according to the set speed Time stops. This process basically does not require parameter setting, and it is feasible to use the parameter preset value when the inverter leaves the factory.
3. Inverter running and debugging with load
Before starting debugging, check that there is no personnel working around the load, and there is no foreign object on the load, and then the load can be debugged. When debugging, set a small frequency first, observe whether the load is running smoothly, whether there is abnormal sound during operation, and analyze the reason if there is; observe the torque of the inverter, and whether the current is abnormal. Generally, when the inverter starts with load, the current torque is low Large, when running to a given frequency, the current torque is relatively stable.
Furthermore, after the running-in period of the external load, the torque current will drop to a certain extent. If the load always reaches the rated value after the inverter is running, it is necessary to judge whether the type selection of the inverter and the motor matches the load. If so, it needs to be replaced in time. The newer model inverter and motor make the control current and torque within the range; in addition, according to the load characteristics, set a reasonable acceleration and deceleration time to ensure that the inverter does not report overcurrent during operation and startup.
In modern industry, the application of frequency converter is becoming more and more important. As the key equipment to control the speed and operation of motor, it plays an indispensable role in many fields. However, before it is put into use, it is very important to debug the frequency converter to ensure its normal operation and stability. Inverter commissioning is usually completed in the following three steps, as follows:
1. Carry out the no-load test run of the inverter first
First check whether all the wiring of the inverter is correct, do not connect the output terminal of the inverter to the motor, and conduct a no-load test on the inverter first. Read the user manual of the inverter carefully before turning on the power, familiarize yourself with the relevant functions, settings, and operation methods, and then turn on the power on this basis.
The purpose of the no-load test run is twofold:
One is to familiarize yourself with the keyboard and related operating methods through actual operations, such as performing operations such as forward, reverse, and stop, and observe the action of the inverter and whether the temperature rise is normal.
The second is to familiarize yourself with the setting and operation methods of related functions in combination with real objects. After setting, you can try to see the action state and action process of the basic functions, such as rising and falling time settings. On this basis, look at the signal of the external terminal to see if the control action is normal, such as when the potentiometer is rotated clockwise or the frequency given current is changed, whether the output frequency of the inverter changes at the same time as the given signal.
2. No-load test run of inverter with motor
After the no-load test run of the inverter is normal, it can be connected to the motor for no-load test run. Before connecting the motor, be sure to confirm that the technical indicators of the motor are qualified.
Do not load the motor. Then let the inverter drive the motor to rotate, and observe whether it is normal, such as whether the direction of rotation of the motor meets the requirements. Turn the frequency setting potentiometer counterclockwise to 0Hz at the left end, then turn on the forward rotation switch (FWD) of the frequency converter, slowly turn the potentiometer clockwise to gradually increase the given frequency, and observe the rotation of the motor. When the maximum frequency is 50%, let the motor rotate for a few minutes, and observe the voltage and current values, then let the output frequency of the inverter reach the maximum frequency, let the motor rotate for a few minutes, and observe the voltage and current values, Then let the output frequency of the inverter reach the maximum frequency, and then let the motor rotate for a few minutes.
Then reduce the output frequency to 75% or 25% of the maximum frequency, let the motor rotate for a while, then increase the output frequency, and then turn off the forward rotation switch (FWD) to see if the motor decelerates according to the set speed Time stops. This process basically does not require parameter setting, and it is feasible to use the parameter preset value when the inverter leaves the factory.
3. Inverter running and debugging with load
Before starting debugging, check that there is no personnel working around the load, and there is no foreign object on the load, and then the load can be debugged. When debugging, set a small frequency first, observe whether the load is running smoothly, whether there is abnormal sound during operation, and analyze the reason if there is; observe the torque of the inverter, and whether the current is abnormal. Generally, when the inverter starts with load, the current torque is low Large, when running to a given frequency, the current torque is relatively stable.
Furthermore, after the running-in period of the external load, the torque current will drop to a certain extent. If the load always reaches the rated value after the inverter is running, it is necessary to judge whether the type selection of the inverter and the motor matches the load. If so, it needs to be replaced in time. The newer model inverter and motor make the control current and torque within the range; in addition, according to the load characteristics, set a reasonable acceleration and deceleration time to ensure that the inverter does not report overcurrent during operation and startup.
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