What is the reason for the overheating of the motor inverter?

Update:24-12-2021
Summary:

The cause and treatment of the inverter overheating and […]

The cause and treatment of the inverter overheating and overloading fault: Phenomenon 1: Overheating: OH is also a common fault.

1. Fan stall: The main cause of the failure: the ambient temperature is too high. The temperature sensor has poor performance and the motor is overheated. Therefore, the temperature sensor is unlikely to be damaged,

2. Example: According to a customer of a frequency converter, it runs for about half an hour and skips OH analysis and maintenance: the fault occurs only after a period of operation. After power on, the fan was found to rotate slowly.

3. Troubleshooting: The temperature of the inverter is indeed too high. The protective cover is all cotton wool (because frequency converters are used in the textile industry). After cleaning, the starting fan works well and will not jump again after several hours of operation.

Fault two. Overload: It is also one of the faults that the frequency converter jumps frequently. Generally speaking, the motor has a strong overload capacity. 1 The cause of the fault: I first need to analyze whether the motor is overloaded or the inverter itself. As long as the motor parameters in the inverter parameter table are set properly, the motor is unlikely to be overloaded.
The frequency converter reports overheating. Why: The motor is working normally, the inverter is suddenly overheated, and it restarts after a power failure? why?

Another reason why the cooling air duct is blocked or the inverter is really small is that there is a problem with the CPU board.

There is also an unlikely reason: the temperature sensor is broken (it is stuck on the heat sink, you can change the position). What is the cause of the motor inverter overheating? The inverter IGBT is overheated?

Inverter IGBT overheating is usually caused by overcurrent faults.

The main reasons for inverter IGBT overheating are too short startup acceleration time, sudden load increase, inverter output short circuit, uneven load distribution, inverter and motor capacity mismatch, internal rectifier side or inverter side component damage, power supply lack of phase , Output disconnection, internal motor fault, ground fault, etc.

The power supply is out of phase, and there are too many inverters working or starting at the same time. The current-limiting resistance of the internal DC circuit of the inverter or the thyristor of the short-circuit current-limiting resistance is damaged, causing external or inter-inverter interference. Inverter overheat protection

1. Inverter module cooling plate overheating protection The inverter module is the main component that generates heat in the inverter, and it is also the most important and fragile component in the inverter. Therefore, each inverter is equipped with an overheating protection device on the heat sink.

2. Fan operation protection The built-in fan of the inverter is the main means of heat dissipation inside the cabinet, which will ensure the normal operation of the control circuit.

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