Attention should be paid to the selection and use of light-root relay RF sensors

　　When selecting the light-root relay RF sensor used in the printed circuit board with small current specifications, because the lead terminal is made of high thermal conductivity material, the welding should be carried out under the condition of temperature less than 250℃ and time less than 10S, such as considering the surrounding temperature, derating can be considered if necessary. Generally, the load current is controlled in the light-root relay RF sensor, the selection and use, and the precautions are used within 1/2 of the rated value.

　　Selection of SSR with various load surge characteristics

　　Many controlled loads will produce a large surge current at the moment of switching on, because the heat is too late to dissipate, it is likely to damage the internal thyristor of the SSR, so the user should analyze the surge characteristics of the controlled load when selecting the relay RF sensor, and then select the relay RF sensor. Make the light-root relay RF sensor can withstand the light-root relay RF sensor under the premise of ensuring steady state operation, select and use, and pay attention to the inrush current. When selecting, refer to Table 2 for derating coefficient of various loads (at normal temperature).

　　If the selected optocoupler relay RF sensor needs to work in the case of more frequent work, life and reliability requirements, it should be multiplied by 0.6 on the basis of Table 2 to ensure reliable work.

　　Generally, the above principles are followed in the selection, and the DC solid-state relay RF using the field effect tube as the output device can be selected when the signal distortion is small at low voltage. For AC resistive loads and most inductive loads, zero-crossing relay RF sensors can be selected, which can extend the life of the load and relay RF sensors and reduce their own RF interference. If it is used as a phase output control, the optional photocoupling relay RF sensor should be used.

　　The effect of ambient temperature on use

　　The load capacity of the light-root relay RF sensor, the selection of use, precautions by the environmental temperature and its own temperature rise is greatly affected, in the installation and use process, should ensure that it has good heat dissipation conditions, rated working current in 10A or more products should be equipped with radiator, 100A or more products should be equipped with radiator plus fan cold. During installation, attention should be paid to the good contact between the bottom of the photocoupling relay RF sensor and the radiator, and consider applying an appropriate amount of thermal conductive silicone grease to achieve the best heat dissipation effect.

　　If the optical lotus root relay RF sensor works at high temperature for a long time (40℃~80℃), the user can select and use the maximum optical lotus root relay RF sensor provided by the manufacturer, pay attention to the output current and ambient temperature curve data, and consider derating use to ensure normal operation.

　　Over current, over voltage protection measures

　　When a photocoupling relay RF sensor is used, Because overcurrent and load short circuit will cause permanent damage to the SSR internal output thyristor, it can be considered to add fast fuses and air switches in the control loop to protect the type (select the photocoupling relay RF sensor should choose product output protection, built-in varistor absorption loop and RC buffer, can absorb surge voltage and improve dv/dt tolerance); The relay RF sensor output can also be connected to RC absorption loop and varistor (MOV) to achieve output protection. The selection principle is to use 500V-600V varistor for 220V, and 800V-900V varistor for 380V.

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