With the advent of summer, various factories have caused more equipment trips due to hot and hot issues. At this time, the stability of the machine operation directly affects the enthusiasm of the workers. The following Xiao Bian will share with others the cases encountered in practice or collected.

In the summertime, in the case of inverters that are indispensable for the speed control of the texturing machines and air compressors, the scorching weather is the cause of overheating of the inverter. A large number of existing researches and practices show that the failure rate of the inverter will rise with the increase of temperature, and the service life will decrease with the increase of temperature. If the ambient temperature rises by 10°C, the service life of the inverter will be reduced by half.

For this reason, we now analyze what the causes of the inverter's overheating are, and how to solve the corresponding problems:

1, the ambient temperature is too high

Reason: The internal frequency converter is composed of a myriad of electronic devices. When it is in operation, it will generate a lot of heat. Especially when the IGBT is operating at high frequency, more heat will be generated. If the ambient temperature is too high, the temperature of the internal components of the inverter may be too high. To protect the internal circuit of the inverter, the inverter will report a high temperature fault and shut down.

Countermeasures: Reduce the temperature of the place where the inverter is located. For example, you can add a forced cooling device such as an air conditioner or a fan to the cabinet.

2, poor ventilation of the inverter

Cause: If the air duct of the inverter is blocked or the air duct of the control cabinet is blocked, the heat dissipation inside the inverter will be affected, causing the inverter to overheat and alarm.

Countermeasures: Regularly check the frequency converter, remove the air from its air duct, and smooth the air duct.

3, fan stuck or damaged

Cause: When the inverter fan is bad, a large amount of heat accumulates inside the inverter and cannot be dispersed.

Countermeasure: Replace the fan.

4, overloaded

Countermeasures: Reduce the load or increase the capacity of the inverter.

It can be seen that the maintenance and maintenance of the frequency converter is particularly important. How can we reduce the failure rate and allow the frequency converter to spend the summer safely and reduce losses? Therefore, we now briefly introduce the following aspects:

1, summer frequency converter maintenance and care these points

Appropriate temperature, humidity, ventilation, dust-free and no interference, internal and external cleaning of the inverter.

2, the main aspects directly affect the cooling of the inverter

1). Fan operation protection, the built-in fan of the inverter is the main means of heat dissipation inside the box, it will ensure the normal operation of the control circuit. Therefore, if the fan does not operate properly, it should be maintained immediately.

2). Overheat Protection of Inverter Module Thermal Inverter The inverter module is the main component of heat generation in the inverter and the most important and most vulnerable component in the inverter. Therefore, each inverter is equipped with thermal protection devices on the heat sink.

3). Brake resistor overheat protection The nominal power of the brake resistor is selected by short-time operation. Therefore, once the power-on time is too long, it will overheat. At this time, use should be suspended until it is cooled. Or use a slightly larger power resistor.

4). The inlet and outlet of the cooling air duct must not be blocked. The ambient temperature may also be higher than the allowable value of the frequency converter.

5). Interference problems should pay attention to the interference of the inverter to the microcomputer control board. The user's own design of the microcomputer control board has a poor level of technology and does not comply with EMC's international standards. After the inverter is used, the conduction and radiation interference generated often cause the control system to work abnormally and take necessary measures.

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