Undervoltage fault means that the voltage on the DC bus is lower than the undervoltage detection value of the inverter, and the inverter reports an undervoltage fault to protect the circuit. The inverter undervoltage indicator light is on, and the reasons can be analyzed and solved from the following aspects:
What are the causes of undervoltage faults?
1. The grid voltage is low.
2. The input terminal is loose or has poor contact.
What are the solutions to undervoltage faults?
1. Check the input power of the grid.
2. Reconnect the input cable to ensure good contact.
Phase failure
Phase loss faults are divided into input faults and output faults. When one of the phases is disconnected due to the failure of the fuse or circuit breaker, it is considered that an input phase loss fault has occurred; and when an output phase loss occurs, the motor starts when it is stationary, and the motor cannot rotate. If there is a phase loss during operation, it is very dangerous. Therefore, the phase loss protection of the Beifu inverter, when a phase loss fault occurs, the inverter controls the motor to stop running to avoid accidents.
▶ Inverter input phase loss fault
What are the causes of input phase loss faults?
1. Input R, S, T have phase loss.
2. The rectifier bridge or charging resistor is damaged.
What are the solutions for input phase loss faults?
1. Check the input power supply.
2. Check the installation wiring.
3. Seek technical support.
▶ Inverter output phase loss fault
What are the reasons for the output phase loss fault?
1. U, V, W phase loss output (or load three-phase serious asymmetry).
2. The connecting wire between the inverter and the motor is loose.
3. The motor is damaged.
What are the solutions to the output phase loss fault?
1. Check the output wiring.
2. Check the wiring between the inverter and the motor.
3. Run the inverter without a motor to see if the output is balanced. If it is balanced, it is determined that the motor is damaged.
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