Proximity switch SG-3PKF-QZ12-HN Proximity sensor SG-03-3C3-24-N1-50 Limit switch SG-03-3C3-24-N1-50 limit switch SG-03-3C3-24-N1-50 limit switch. Image proximity switch SG-3PKF-QZ12-HN proximity sensor SG-03-3C3-24-N1-50 limit switch. Parameter proximity switch, also known as proximity sensor, has certain applications in many fields. Proximity sensors have advantages such as stability, long lifespan, low power consumption, frequent action response, and are waterproof and dustproof. The wiring method for proximity switches is quite complex, and users need to master certain wiring knowledge in order to correctly and quickly install the proximity switch. So what is the correct wiring method for proximity switches? Today, the editor will introduce it to everyone< (1) There is a difference between two wire and three wire proximity switches. The working voltage of two wire proximity switches is divided into AC (alternating current) and C (direct current) power sources, while three wire proximity switches are further divided into NPN and PNP types, and their wiring methods are different. Duokai Company also has four wire products, which are based on the three wire system and achieve dual signal terminals of normally open (NO) and normally closed (NC), reducing inventory and costs for customers< (2) The wiring method of the two wire proximity switch is relatively simple. After the proximity switch is connected in series with the load, it can be connected to the power supply. The C power supply product needs to distinguish between the red (brown) wire connected to the positive end of the power supply, the blue (black) wire connected to the 0V (negative) end of the power supply, and the AC power supply product does not need it< (3) Wiring of three wire or four wire proximity switches: Connect the brown wire (BN) to the positive (+) end of the power supply; Connect the blue wire (BU) to the 0V (negative) end of the power supply; The black wire (BK) or white wire (WH) is the signal terminal and should be connected to the load< (4) The wiring of a three wire or four wire load is as follows: except for the load connected to one end of the proximity switch signal, for NPN type proximity switches, the other end of the load should be connected to the positive (+) end of the power supply; For PNP type proximity switches, the other end of the load should be connected to the 0V (negative) end of the power supply< The load of proximity switches can be signal lights, small relay coils, or digital input modules of programmable PLCs< (6) For programmable PLCs, special attention should be paid to the type selection of three wire or four wire proximity switches connected to the PLC digital input module. PLC digital signal input modules can generally be divided into two types: one type has a common input terminal of 0V power supply, and the current flows out from the input module (mode). In this case, NPN type proximity switches must be selected; Another type of common input is the positive end of the power supply, where current flows into the input module (European mode). In this case, PNP type proximity switches must be selected. Don't make the wrong choice< (7) When the two wire proximity switch is subjected to working conditions, the switch itself generates a certain voltage drop when conducting, and there is also a certain residual leakage current flowing when cutting off. Therefore, consideration should be given when selecting it. Although the three wire proximity switch has an additional wire, it is not affected by adverse factors such as residual leakage current, making it more stable and reliable during operation.