The commissioning of the installed inverter control cabinet can be carried out in the following steps:

1. Preparation before commissioning

1. Check the equipment:

- Carefully check whether all electrical components in the variable frequency control cabinet are firmly installed, whether the wiring is correct and tight, and whether there is any loosening or falling off. In particular, pay attention to check whether the connection cables between the inverter and the power supply and the motor are correctly connected.

- Check whether the grounding system of the control cabinet is good, and the grounding resistance should meet the relevant standards and requirements, generally no more than 4 ohms.

- Check whether the ventilation and heat dissipation system in the control cabinet is working properly to ensure that the inverter can get good heat dissipation during operation.

2. Prepare tools and instruments:

- Prepare tools required for debugging, such as screwdrivers, wrenches, and multimeters.

- Prepare measuring instruments, such as oscilloscopes, frequency meters, voltmeters, ammeters, etc., in order to accurately measure electrical parameters during commissioning.

3. Familiar with equipment information:

- Read the user manual and technical data of the inverter in detail, and understand the function, parameter setting method, debugging steps and precautions of the inverter.

- Familiar with the technical parameters of the controlled motor, such as rated power, rated voltage, rated current, rated speed, etc.

Second, before the power test

1. Insulation resistance test:

- Insulation resistance test of power line, control line and motor windings in inverter control cabinet using megohm meter. The insulation resistance of the power line should not be less than 1MΩ, the insulation resistance of the control line should not be less than 0.5MΩ, and the insulation resistance of the motor winding should not be less than 5MΩ.

2. Main loop check:

- Disconnect the connection between the frequency converter and the motor, short-circuit the output end of the frequency converter, and then use a multimeter to measure the resistance value between the input end and the output end of the frequency converter, which should be close to zero. If the resistance value is too large or infinite, it indicates that there is a fault in the main circuit, and it is necessary to check whether the rectifier bridge of the inverter, the inverter module and other components are damaged.

3. Check the control loop:

- Send the control power to the control cabinet, and check whether the control buttons, indicators, relays and other components are working normally. Press the start button, observe whether the relay is drawn, whether the indicator light is on; Press the stop button to see if the relay is released and the indicator is off.

3. Parameter setting

1. Basic parameter Settings:

- According to the rated parameters of the controlled motor, set the basic parameters of the inverter, such as the rated power, rated voltage, rated current, rated frequency, etc. These parameters are the basis for the normal operation of the inverter and must be set accurately.

- Set the control mode of the inverter, such as V/F control, vector control, etc. According to different applications and motor types, choose the appropriate control mode.

2. Advanced parameter Settings:

- According to actual needs, set the frequency converter acceleration time, deceleration time, highest frequency, lowest frequency and other parameters. The setting of acceleration time and deceleration time should be reasonably adjusted according to the inertia of the load and the process requirements to avoid excessive impulse current during the start and stop of the motor.

- Set the protection parameters of the inverter, such as overcurrent protection, overvoltage protection, undervoltage protection, overheat protection, etc. The setting of these protection parameters should be reasonably adjusted according to the rated parameters of the motor and frequency converter and the actual operating environment to ensure the safe operation of the equipment.

Four, no-load debugging

1. Start the inverter:

- Set the output frequency of the inverter to a lower value, such as 5Hz, and then press the start button to start the inverter. Observe the display of the frequency converter to confirm whether the frequency converter starts normally and the output frequency is stable.

2. Check the running state of the motor:

- Observe whether the rotation direction of the motor is correct. If the rotation direction of the motor is opposite to the required direction, the rotation direction of the motor can be changed by adjusting the output phase sequence of the inverter.

- Check the running sound and vibration of the motor with a listening rod or vibration tester. Under normal circumstances, the running sound of the motor should be smooth and the vibration should be small. If the running sound of the motor is abnormal or the vibration is large, it may be that the motor itself is faulty or the parameter setting of the inverter is unreasonable, and further inspection and adjustment are needed.

3. Measure electrical parameters:

- Use multimeter, voltmeter, ammeter and other instruments to measure the input voltage, input current, output frequency and other parameters of the motor, and confirm whether these parameters are within the normal range. At the same time, observe whether the parameters displayed on the display screen of the inverter are consistent with the actual measured parameters, if not, it may be the wrong parameter setting or the error of the measuring instrument, which needs to be further checked and adjusted.

5. Load debugging

1. Connection load:

- Connect the motor to the load device to ensure a strong and reliable connection.

2. Gradually increase the load:

- Slowly increase the output frequency of the inverter, while observing the operation of the motor and load equipment. Gradually increase the load until the rated load of the equipment is reached. In the process of increasing the load, it is necessary to pay attention to the changes in the current, speed, output power and other parameters of the motor, and whether the operating state of the load equipment is normal.

3. Adjust parameters:

- According to the actual load situation, adjust the parameters of the inverter, such as acceleration time, deceleration time, torque compensation, etc., to ensure that the motor and load equipment can run stably. During parameter adjustment, observe the operating status and electrical parameters of the device to avoid device faults caused by improper parameter adjustment.

4. Test the protection function:

- In the process of load debugging, simulate various fault conditions, such as over current, over voltage, under voltage, overheating, etc., to test whether the protection function of the inverter is working normally. When a fault occurs, the inverter should be able to stop the output in time and display the corresponding fault code.

Vi. Work after commissioning

1. Record parameters:

- Record all parameters set during debugging, including basic parameters, advanced parameters, and protection parameters, for future reference.

2. Tidy up the site:

- Clean up the debugging site, organize the tools and instruments, and keep the working environment clean.

3. Write debugging report:

- Write a detailed debugging report according to the debugging process and results, including debugging steps, test data, troubleshooting, conclusions, etc. The debugging report should be saved as part of the device file.