Automation Direct SC-E02G-24VDC Contactor

Automation Direct SC-E02G-24VDC Contactor

Brand: Automation Direct

Place of Origin: USA

Automate Direct was founded in 1994 and has a history of nearly 27 years of development. It has rapidly grown from a small company PLC to a * * brand in the industrial automation market. The main products of Automation Direct in the United States include: Automation Direct AC drives, Automation Direct sensors, Automation Direct transformers, Automation Direct temperature switches, pressure switches, temperature probes, cables, fuses, industrial displays, Automation Direct relays, Automation Direct timers, Automation Direct encoders, etc.

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Automation Direct SC-E02G-24VDC Contactor

Shandong Sailite Automation specializes in importing European and American imported parts from Germany, the United States, Italy, and other countries; Main products: industrial accessories, electromechanical parts, commonly used instruments and meters, mechanical equipment, etc.

Industrial Knowledge

Photoelectric proximity switch

A switch made using the photoelectric effect is called a photoelectric switch. Install the light-emitting device and the optoelectronic device in the same detection head in a certain direction. When a reflective surface (the object being detected) approaches, the photoelectric device receives the reflected light and outputs a signal, thereby "sensing" that an object is approaching.

Other types of proximity switches

When the observer or system changes the distance to the wave source, the frequency of the approaching wave will shift, and this phenomenon is called the Doppler effect. Sonar and radar are made using the principle of this effect. Doppler effect can be used to create ultrasonic proximity switches, microwave proximity switches, etc. When an object approaches, the reflected signal received by the proximity switch will produce a Doppler frequency shift, which can identify whether an object is approaching.

Structural form

Proximity switches can be divided into cylindrical, square, groove, perforated (through), and separated types according to their external shapes. The cylindrical type is easy to install, but its detection characteristics are the same. The detection part of the groove type is on the inside of the groove, used to detect objects passing through the groove. The through type is rarely produced in China, while it is more commonly used in Japan and can be used for assembling small parts such as screws or balls and buoys into water level detection devices.

Proximity switch wiring diagram

1) There is a difference between two-wire and three wire proximity switches. Three wire proximity switches are divided into NPN and PNP types, and their wiring is different.

2) The wiring of the two-wire proximity switch is relatively simple. The proximity switch can be connected in series with the load and then connected to the power supply.

3) The wiring of the three wire proximity switch: the red (brown) wire is connected to the positive end of the power supply; Connect the blue wire to the 0V end of the power supply; The yellow (black) line is the signal and should be connected to the load. The other end of the load is connected as follows: for NPN type proximity switches, it should be connected to the positive terminal of the power supply; For PNP type proximity switches, they should be connected to the 0V terminal of the power supply.

4) The load of the proximity switch can be a signal light, relay coil, or digital input module of a programmable logic controller (PLC).

5) Special attention should be paid to the type selection of the three wire proximity switch connected to the PLC digital input module. PLC digital input modules can generally be divided into two types: one type has a common input terminal as the negative terminal of the power supply, and current flows out from the input module. In this case, NPN type proximity switches must be selected; Another type of common input terminal is the positive pole of the power supply, and current flows into the input module. In this case, it is necessary to use a PNP type proximity switch. Don't choose the wrong one.

6) The two-wire proximity switch is limited by working conditions. When it is turned on, the switch itself generates a certain voltage drop, and when it is turned off, there is a certain residual current flowing through it. Therefore, it should be considered when selecting it. Although the three wire proximity switch has an additional wire, it is not affected by adverse factors such as residual current and works more reliably.

7) Some manufacturers will simultaneously output the "normally open" and "normally closed" signals of the proximity switch, or add other functions. In this case, please follow the product manual for specific wiring.

Slot type photoelectric switch wiring

The diode of the photoelectric switch is a light-emitting diode, and the output is a phototransistor. C is the collector and E is the emitter.

When a transistor is used as a switch, the collector is usually used as the output terminal.

General connection: The diode is the input terminal, E is grounded, C is connected to the load, and the other end of the load needs to be connected to a positive power supply. This method has a wide range of applications.

Special connection method: The diode is the input terminal, C is connected to the positive power supply, E is connected to the load, and the other end of the load needs to be grounded. This connection method is only applicable when the equivalent resistance of the load is very small (within a few tens of ohms). If the equivalent resistance of the load is relatively large, it may cause the working point of the switch transistor to be abnormal, resulting in unreliable switch operation.