1. Fault cause analysis
Power supply problem:
The power supply voltage is unstable or too low.
The power cable is aging and in poor contact.
Inverter internal failure:
One of the rectifier Bridges is damaged or one of the three thyristor circuits is working abnormally.
The filter capacitor fails.
The main circuit contactor is damaged, resulting in a DC bus voltage loss on the charging resistor.
The voltage detection circuit is faulty.
2. Troubleshooting method
Check the power supply:
Use a multimeter and other tools to measure the power supply voltage to ensure that it is stable and meets the working requirements of the inverter.
If there is a problem with the power supply, such as low voltage or unstable, replace or repair the power supply in time.
Check inside the inverter:
Observe the operating status of the inverter and check whether there are signs of component damage.
Disassemble the inverter, clean the internal board, and check whether the rectifier bridge, filter capacitor and other components are damaged.
If a component is found damaged, replace it in time.
Check the voltage detection circuit:
If the voltage detection circuit is faulty, it may cause the inverter to falsely report undervoltage.
Test and repair the voltage detection circuit to ensure its normal operation.
Other checks:
Check whether the main loop contactor is damaged, if damaged, replace it.
Check whether the connection cable between the frequency converter and the motor is in good contact and is not loose or damaged.
3. Preventive measures
Regular maintenance:
Regular maintenance of the frequency converter, cleaning dust, fastening screws, etc.
Check the power supply line regularly to ensure that it is in good contact and does not age.
Optimize the operating environment:
During the operation of the equipment, avoid frequent start-stop, heavy load and other operations to reduce the impact and damage to the inverter.
Ensure that the inverter operating environment is well ventilated to avoid overheating.
Regular testing:
Regular inspection of frequency converters with professional instruments to detect and deal with potential faults in a timely manner.
4. Precautions
Safety first:
Before performing any repair operations, make sure that the power supply is disconnected and take the necessary safety measures.
Professional maintenance:
If the fault cannot be resolved by yourself, contact professional maintenance personnel.
Backup data:
Before maintenance of the inverter, it is recommended to back up related parameters and data to avoid loss.