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Electric Components Industrial Control Commonly Used
May 10, 2017

The electrical component relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit), usually used in automatic control circuits, which are actually controlled with a smaller current A large "current switch" Electric Components for larger current. Electrical components such as the circuit in the automatic adjustment, security protection, conversion circuit and other effects when the input (such as electricity, magnetic, sound, light, heat) reaches the specified value, so that the control output circuit is turned on or off Electrical appliances. Can be divided into electrical quantities (such as current, voltage, frequency, power, etc.) relays and non-electrical quantities (such as Electric Components temperature, pressure, speed, etc.) relay two categories. With fast action, stable work, long life, small size and so on. Widely used in power protection, automation, sports, remote control, measurement and communication.

Electrical components Electromagnetic relay works and characteristics: Electromagnetic relays generally by the core, coil, armature, contact reed and other components. As long as the coil at both ends with a certain voltage, the coil will flow through a certain current, resulting in electromagnetic effects, the armature will be in the role of electromagnetic force to overcome the return of the spring to overcome the tension of the core, Moves the contact with the static contact (normally open contact). When the coil power, the electromagnetic force will disappear, the armature will be in the spring of the reaction force to return to its original position, so that the contact with the original static contact (normally closed contact) pull. So that pull, release, Electric Components so as to achieve the circuit in the conduction, Electric Components cut off the purpose. For the relay "normally open, normally closed" contacts, it can be distinguished: relay coil is not in power when the state of the static contact, known as the "normally open contact"; in the state of the static contact As "normally closed contact".

Thermal relay is generated by the current flowing into the heat element heat, so that different expansion coefficient of bimetal deformation occurs, the electrical components when the deformation reaches a certain distance, it will promote the linkage action, so that the control circuit Electric Components is broken, so that contactor lost Electricity, the main circuit is disconnected, to achieve the motor overload protection. Relay as the motor overload protection components, with its small size, simple structure, low cost advantages in the production has been widely used. In view of the bimetallic sheet heating process, the heat transfer takes a long time, therefore, the thermal relay can not be used for short circuit protection, but can only be used as overload protection. Thermal relay is mainly used to protect the motor overload, so the choice must understand the situation of the motor, such as the working environment, starting current, load nature, working system, allowing overload capacity.

AC contactors are widely used as power break and control circuits. Use the main contact to open and close the circuit, with auxiliary contacts to control the implementation of instructions. Electric Components The main contact is generally only normally open contacts, and auxiliary contacts often have two pairs of normally open and normally closed contact, small contactors are often used as an intermediate relay with the main circuit.

AC contactor action power from the AC electromagnet, electromagnet by two "mountain" shaped silicon steel sheet stacked, one of the fixed, put on the coil in the above, the working voltage has a variety of options. In order to stabilize the magnetic force, the suction surface of the core, Electric Components plus the short circuit. The AC contactor relies on a spring return after power failure. The other half of the electrical components is the movable iron core, which is constructed and fixed to drive the main contacts and auxiliary contacts. 20 amperes above the contactor with an arc extinguishing cover, the use of breaking the circuit when the electromagnetic force generated, quickly pull off the arc to protect the contacts.

Use of the classification: contactor is an automated control of electrical appliances. The contactor is mainly used for frequent interruption or breaking of AC and DC circuits, with large control capacity, long distance operation, with the relay can be achieved timing operation, interlock Electric Components control, a variety of quantitative control and pressure and undervoltage protection, In the automatic control circuit, the main control object is the motor, can also be used to control other electric load, such as electric heater, lighting, welding machine, capacitor group and so on. Contactor according to the type of charged current can be divided into AC contactor and DC contactor. AC contactor can be divided into two kinds of electromagnetic and vacuum. Electromagnetic type AC contactor model for the CJ. Vacuum AC contactor model for the CZ. In recent years, the new development of the B series AC contactor, the model for the BXX.

When the control cabinet in the line more, in order to beautiful and convenient wiring, the line into the plastic wiring slot. The wiring trough is composed of two parts of the groove bottom and the groove cover, and the plastic trunking without the holes on both sides is used for indoor alignment.

The wires and cables between Electric Components the control cabinet and the power equipment or control cabinet to other control cabinets are generally laid through cable trays or cable trenches. Cable bridge is divided into trough, tray and ladder-type structure, by the bracket, arm and installation accessories and other components. In order to reduce the weight can also be used aluminum alloy cable and glass steel bridge.

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