What are the main components of the inverter system hardware? Inverter fault diagnosis and maintenance

The variable frequency drive system is a power electronic device system used to control the speed and output frequency of AC motors. It controls the speed and output power of the motor by changing the frequency and voltage of the input power supply to meet the precise control under different load requirements and operating conditions.

Main hardware components of the inverter system

Inverter host: The inverter host is the core device responsible for controlling the speed and output frequency of the motor. It usually includes a digital signal processor (DSP) or a microprocessor, power electronic devices, input/output interfaces, etc.

Rectifier: The rectifier converts AC power into DC power and provides power to the inverter host. It usually includes components such as rectifier bridge and capacitor.

Inverter: The inverter converts DC power into adjustable AC power to drive the motor. It usually includes components such as inverter bridge and filter circuit.

Capacitor Banks: Capacitor banks are used to store energy, balance voltage fluctuations, and provide short-term power output support.

Filter: Filters are used to remove harmonics from the inverter output to ensure smooth output current and low ripple levels. Common filters include LC filters and electromagnetic compatibility (EMC) filters.

Sensors: Sensors (such as temperature sensors, speed sensors, etc.) are used to monitor various parameters of the motor and system, and transmit data to the inverter host for control and protection.

Interface and control panel: The interface and control panel are used to operate and monitor the inverter system, including parameter setting, start and stop control, fault diagnosis, etc.

Cooling system: The cooling system is used to dissipate heat and keep the temperature of the inverter host and other key components within the appropriate working range.

These hardware components work together to achieve precise control of the motor's frequency and speed, allowing the inverter system to provide efficient and adjustable motor operation under different load requirements.

The inverter system can more accurately control the speed and output power of AC motors, achieve energy saving, reduce noise and vibration, improve production efficiency and other applications. The inverter system is widely used in industrial fields, motor drive systems, energy conservation and environmental protection and other fields.

Frequency Converter Fault Diagnosis and Repair

1. Types of faults and causes of faults

1. Type of fault

Faults are divided into power failure, internal failure and load failure.

Power failure: The power grid to which the inverter is connected is faulty.

Internal fault: Fault in the inverter itself

Load fault: The motor fails, such as phase failure, overload, short circuit, etc.

2. Cause of failure

There are two reasons for the failure, external reasons and internal reasons.

External reasons: Faults caused by factors outside the inverter, such as operating errors, incorrect parameter settings, external interference, etc.

Internal reasons: Faults caused by factors inside the inverter, such as short circuit, component damage, poor contact of connectors, etc.

2. Frequency Converter Fault Diagnosis and Repair

Some instruments and frequency converters can be used to diagnose faults.

Troubleshooting process

① Check the inverter's fault phenomenon and indications, as well as changes in the external environment when the fault occurs.

②Analyze the cause of the failure.

③Open the equipment to check the damaged parts and analyze the feasibility of repair and restoration.

④ Analyze the working principle of the circuit from the working position of the damaged device and find out the cause of the damaged device.

⑤Find related devices to replace.

⑥ After all causes of the fault have been eliminated, power on and conduct the test. During this step, all external conditions must be met and the fault will not expand.