Based on technical specifications for the **DWB-SJS-R1**, which is a widely used control board for **Automatic Boom Barriers** (often associated with brands like Wejoin or similar industrial gate manufacturers), here is a breakdown of its electronic components and functions. --- ## 1. Overview of DWB-SJS-R1 The DWB-SJS-R1 is the "brain" of a high-speed barrier gate system. It integrates power management, motor logic, and safety sensor interfaces into a single PCB. ### Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Input Voltage** | AC 220V ±10% / 110V (Switchable) | | **Motor Type** | AC Torque Motor / Servo Motor (model dependent) | | **Frequency** | 50Hz / 60Hz | | **Remote Range** | $\ge$ 30 meters | | **Controller Type** | Microprocessor-based Integrated Logic | --- ## 2. Key Electronic Components ### A. Control Microprocessor The heart of the board is a microcontroller (MCU) that handles logic timing. It calculates the deceleration points to ensure the barrier arm doesn't bounce or hit the mechanical stops too hard. ### B. Motor Driver Relays / Thyristors * **Function:** Switches the high-voltage AC power to the motor. * **Directional Control:** Two distinct relays manage the "Open" and "Close" circuits, ensuring both cannot be active simultaneously to prevent short circuits. ### C. Limit Switch Interface * **Magnetic/Optical Inputs:** Connects to the hall-effect sensors or mechanical switches that tell the board when the arm is perfectly vertical ($90^\circ$) or horizontal ($0^\circ$). ### D. Communication & Expansion Ports The DWB-SJS-R1 typically features a row of terminal blocks: 1. **Loop Detector Input:** Triggers the "Auto-close" function once a vehicle passes. 2. **Photocell/Infrared Input:** Safety feature to prevent the arm from lowering if an object is detected. 3. **RS485 Port:** Often included for integration with parking management software. --- ## 3. Safety and Protection Circuits * **Fuse Protection:** A glass or ceramic fuse (usually 5A-10A) protects the board from overcurrent. * **Auto-Reverse Logic:** If the motor encounters resistance (detected via current sensing or an encoder), the board instantly reverses the direction to prevent injury. * **DIP Switches:** Small toggle switches on the board allow technicians to set: * Auto-closing time (e.g., 5s, 10s, 20s). * Sensitivity levels for obstacle detection. --- ## 4. Wiring Pinout Diagram (Typical) ```text [ AC-L ] [ AC-N ] [ Ground ] -> Power Input [ COM ] [ OPEN ] [ CLOSE ] -> External Push Button [ 12V ] [ GND ] [ Signal ] -> Photocell Power & Input [ Loop ] [ COM ] -> Induction Loop Detector ``` ---