The **LC2-3A-R/K** is a specific type of **Rotary Limit Switch** commonly used in industrial machinery, cranes, and heavy lifting equipment. It is designed to control the movement of mechanical systems by measuring the number of revolutions of a shaft. Below is a breakdown of its electronic and electromechanical components. --- ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Component Type** | Rotary Limit Switch | | **Ratio Options** | Typically ranges from 1:15 to 1:400 (model dependent) | | **Contact Type** | Snap-action microswitches (1NO + 1NC) | | **Rated Voltage** | Up to 250V AC / 24V DC | | **Rated Current** | 10A to 16A (Thermal) | | **Protection Class** | IP65 (Dust-tight and water-jet resistant) | --- ### 2. Internal Electronic & Mechanical Parts #### A. The Microswitches Inside the housing, the LC2-3A-R/K contains multiple **snap-action switches**. These are the "electronic" heart of the device. * **Function:** When the cams reach a specific position, they physically press the lever of the microswitch, opening or closing an electrical circuit. * **Terminals:** Usually features screw terminals for easy wiring of control circuits (e.g., stopping a motor or triggering an alarm). #### B. The Reduction Gearbox To translate high-speed motor rotations into a slow, measurable movement, the device uses a series of **nylon or metal gears**. * **Ratio:** If the ratio is 1:50, the input shaft must turn 50 times for the internal cam shaft to turn once. This allows for precise "end-of-travel" limit setting over long distances. #### C. Adjustable Cams Each microswitch is associated with a **Cam**. * **Adjustment:** These cams can be rotated and locked into specific angles using a calibration screw. * **Purpose:** This allows the user to set the exact point (the number of rotations) at which the electrical signal is triggered. #### D. The Housing Constructed from reinforced thermoplastic or die-cast aluminum, the housing provides **electrical insulation** and mechanical protection against harsh environments. --- ### 3. Common Applications * **Overhead Cranes:** To prevent the hook from hitting the drum (top limit) or hitting the floor (bottom limit). * **Industrial Doors:** To stop the motor once the shutter is fully open or closed. * **Wind Turbines:** Used to monitor the yaw or pitch position. ---