Internal causes and preventive measures of inverter failure

The problem of the inverter is not only affected by external factors, but also by internal factors.

1. The inverter parameter setting is unreasonable and countermeasures to make the inverter work normally, in addition to the normal equipment, the parameter setting is also very important, if the parameter is set improperly, it will not be able to meet the working demand conditions, and it will lead to the failure of starting and braking, so the parameters must be set correctly when using.

Precautionary measures: In order to prevent the inverter from being caused by unreasonable parameter settings, it is necessary to set it in strict accordance with the manual or relevant regulations when setting, such as in the speed control setting, it is necessary to confirm it after static or dynamic identification; For the setting of the starting method, the factory manual is generally set to the panel start, but in practice, the user can set it according to the practical situation required by the operation, etc., and the normal operation of the inverter can be ensured after reasonable setting of parameters.

Internal causes and preventive measures of inverter failure

Internal causes and preventive measures of inverter failure

2. Overvoltage problems and precautionary measures

The overvoltage of the inverter is mainly on the DC bus, under normal circumstances, the inverter has a normal operating voltage scale, and the inverter can work normally in this scale, once the voltage exceeds this scale, the overvoltage problem is very likely to cause damage to the inverter, such as the overvoltage caused by the power supply is too high; Overvoltage caused by DC loop voltage exceeding tripped voltage, etc., regardless of the reason, will have a negative impact on the inverter.

Precautionary measures: ensure that the power supply voltage is within the normal working voltage scale of the inverter, and carry out regular maintenance, and check whether the deceleration time of the inverter frequency converter is correct, if it is found that the setting is too short, appropriately extend the deceleration time, in addition, set the ramp descent time to match the inertia of the load.

3. Overload machine prevention

When the overload problem is presented, the motor can still work, but its working current has exceeded the rated value, this problem is a moment of accumulation, so it is not easy to be found in the early stage of the problem, easy to be ignored, and generally in the discovery period, it is a more serious period, and the impact on the inverter is relatively large.

Precautionary measures: because the overload problem has the accumulation of time, so its prevention is the main way to eliminate the problem, in the daily operation, it can be prevented by extending the acceleration time, braking time and checking the power grid voltage. For the inverter that has shown overload problems, after checking the balance of the output three-phase, whether there is a surge absorption device on the motor cable, whether the switch at the output end of the inverter is malfunctioning, and whether the acceleration time and parameters of the inverter are set correctly, the cause is confirmed and then "symptomatic treatment".

The most effective way to reduce the occurrence of problems is daily protection, through the protection operation, the problem can be found in time, and can be solved in time, effectively controlling the further severity of the problem. After the daily inspection of the inverter, the relevant data are recorded, and the comparative analysis is carried out, and the abnormal is immediately dealt with; In daily operation, measure the operating temperature and radiator temperature in order to regulate the temperature; Strengthen the daily cleaning and maintenance of the inverter, regularly remove the dust of the inverter, keep it clean, pay attention to the heating situation in the inverter when cleaning, whether there is any abnormality, and record the results of each inspection for the next comparison.

In short, although the inverter has played a very important role in industrial production, it meets the requirements of social development under the background of advocating "energy saving". However, its effect not only depends on the superiority of its own skills, but also depends on the daily protection and less fault rate, so it is necessary and critical to strengthen the daily protection and prevention of the inverter to maximize its effect.　　Inverter speed regulation skill is a combination of strong and weak electricity, mechatronics comprehensive skills, not only to deal with the huge power conversion, but also to deal with the collection, replacement and transmission of information, so its common skills must be dividends power conversion and weak current control two parts. General-purpose inverters generally adopt the alternating and orthogonal method, and are composed of the following two parts:

Main circuit: The main circuit of the inverter includes the rectifier part, the DC link, the inverter part, the braking or feedback link, etc.

Control loop: The control loop includes the core software algorithm circuit of the inverter, the detection and sensing circuit, the input and output circuit of the control signal and the protection circuit.

Internal causes and preventive measures of inverter failure

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