①Usually, frequency converters need to detect the inlet temperature, which can be understood as the ambient temperature; The temperature of the radiator near the rectifier bridge, the temperature of the radiator near the inverter bridge, and the detection points vary depending on the power.

② At the beginning of the development of the frequency converter, it has already passed the verification of thermal balance, that is, the heat generation of the frequency converter under rated load is balanced with the heat dissipation of the frequency converter, which means that the frequency converter will not overheat under normal working conditions.