Inverter malfunctions are numerous and require specific maintenance and troubleshooting methods. Correct installation, use, and maintenance, along with standardized operating procedures, can effectively prevent inverter malfunctions. Common inverter malfunctions mainly include the following:
1. Overcurrent fault
Causes: The inverter protection is triggered due to excessive load current or damage to internal components of the inverter.
Solution: Check if the load current is too high, or if there is a short circuit. Increase the cable cross-sectional area, install a voltage reduction device, or replace internal components such as capacitors.
2. Overheating fault
Cause: Overheating of internal components or heat sinks in the frequency converter can trigger the frequency converter's protection system and may even damage internal components.
Solutions include: improving ventilation and heat dissipation, cleaning the radiator, ensuring unobstructed heat transfer channels, or adjusting the output power, while also checking whether the internal components of the frequency converter are working properly.
3. Undervoltage fault
Causes: Unstable input voltage, excessively long power supply lines, or low grid voltage can trigger the inverter's protection.
Solution: Check if the input voltage is normal, check if the power supply line is tight, or use a voltage regulator or other devices to ensure the grid voltage is stable.
4. Overload fault
Causes: Motor overload, transmission failure, or sudden load changes can trigger the inverter protection.
Solutions include reducing the load, increasing the inverter's output power, changing the transmission device, or reducing sliding or rolling friction.
5. Output short circuit fault
Causes: Short circuits in the output terminal or control circuit can trigger the inverter's protection.
Solution: Resolve issues such as short circuits in the output terminal or control circuit, such as replacing and repairing damaged components, cleaning and maintaining contactors, and repairing burnt-out fuses.
6. Fault code display
Causes: When the frequency converter malfunctions, a corresponding fault code will be displayed on the screen. The specific cause of the malfunction needs to be diagnosed based on the fault code.
Solution: Consult the fault code manual to check if the corresponding circuit or component is faulty, and take appropriate measures for maintenance, such as replacing the damaged component.
7. Large control error
Cause: Under certain special conditions, such as cold, humid, or corrosive environments, the control error of the frequency converter will increase.
Solutions include improving precision, adding position or speed feedback methods, and reducing human interference at the interface to reduce control errors.
In summary, inverter malfunctions require specific analysis of each situation, and appropriate solutions should be implemented. Maintaining the inverter's proper operation and performing routine maintenance are also crucial to ensure its normal functioning. If the fault cannot be resolved, professional technicians should be contacted for maintenance promptly.
