The **LC4H-R4-DC24VS** is a high-performance electronic digital timer manufactured by Panasonic (formerly Sunx). It is designed for industrial automation and precise control applications. Below is a detailed breakdown of its electronic components and specifications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Number** | LC4H-R4-DC24VS | | **Supply Voltage** | 24V DC | | **Display Type** | 4-digit Backlit LCD (Dual-line: Set Value & Elapsed Time) | | **Output Type** | Relay Contact (1c) | | **Time Range** | 0.001s to 999.9h (Switchable) | | **Mounting** | Flush Mount (Panel) / Screw Terminal | | **Protection** | IP66 (Front Panel) | --- ### 2. Core Electronic Components & Functions #### A. Control Interface (The Display) The unit features a bright, 7-segment LCD. The top row (red/amber) typically shows the **Current Value**, while the bottom row (green) shows the **Set Value**. This allows for real-time monitoring of the timing process. #### B. Internal Logic (Microcontroller) The "brain" of the LC4H is a CMOS-based microcontroller. Unlike older mechanical timers, this digital IC allows for: * **Multiple Operating Modes:** Delay-on-make, Flicker, One-shot, and Signal ON/OFF delay. * **High Accuracy:** Digital oscillators ensure minimal drift compared to RC-circuit timers. #### C. Output Mechanism (Relay) The **"R"** in the model name signifies a **Relay Output**. * It uses a Form C contact (Changeover). * **Capacity:** 5A at 250V AC (resistive load). * **Mechanical Life:** Up to 20 million operations. #### D. Input Circuits The device includes terminals for **Signal, Reset, and Stop** inputs. * These are usually "no-voltage" inputs (contact closure) or open-collector transistor inputs. * The **"S"** at the end of the model name indicates the **Screw Terminal** type for secure industrial wiring. --- ### 3. Connection Pinout (Simplified) While always refer to the side-label diagram, the standard pin layout for the LC4H series follows this logic: | Terminal No. | Function | | :--- | :--- | | **1 & 2** | Power Supply (24V DC) | | **3** | Signal Input (Start) | | **4** | Reset Input | | **5** | Stop Input | | **6, 7, 8** | Relay Contacts (Common, NO, NC) | --- ### 4. Application Use-Case This part is commonly found in: 1. **Packaging Machines:** To control the duration of heat sealing. 2. **Conveyor Systems:** To manage sorting delays. 3. **Laboratory Equipment:** For precise chemical reaction timing.