Electrical system composition

The basic return route of commonly used control circuits consists of the following parts.

(1) Power supply circuit. There are various power sources for the power supply circuit, including AC380V and 220V.

(2) Protection circuit. There are various working power sources for the protection (auxiliary) circuit, including single-phase 220, 36V or DC 220, 24V, etc., which provide various protections for electrical equipment and circuits such as short circuit, overload, and voltage loss. They are composed of protective components such as fuses, thermal relays, voltage loss coils, rectifier components, and voltage stabilizing components.

(3) Signal circuit. A circuit that can timely reflect or display the normal and abnormal working status information of equipment and circuits, such as signal lights of different colors, audio equipment with different sounds, etc.

(4) Automatic and manual circuits. In order to improve work efficiency, electrical equipment generally has automatic links. However, in installation, debugging, and emergency handling, manual links need to be set in the control circuit to achieve automatic and manual conversion through combination switches or transfer switches.

(5) Brake parking circuit. The control process of cutting off the power supply of the circuit and taking certain braking measures to quickly stop the motor, such as energy consumption braking, power reverse connection braking, reverse pull reverse connection braking, and regenerative power generation braking.

(6) Self locking and locking are the same path. After the start button is released, the circuit remains energized and the electrical equipment can continue to work, which is called a self-locking link. For example, the moving and closing contacts of a contactor are connected in series in a coil circuit. Two or more electrical devices and components, in order to ensure the safety and reliability of equipment operation, can only be started with one device powered on, and the other cannot be started with the other device powered on, which is called the locking link. If the dynamic break contacts of two contactors are connected in series in the other coil circuit.

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