The **LC4H-R4-AC240VS** is a high-performance electronic digital timer manufactured by Panasonic (formerly Sunx). It is designed for industrial automation and panel mounting, featuring a high-degree of protection and a bright LED display. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Voltage** | 100V to 240V AC (Wide range) | | **Output Type** | Relay Contact (Timed-out 1C) | | **Contact Rating** | 5A at 250V AC (Resistive load) | | **Display Type** | 4-digit Backlit LCD (Bright 2-color display) | | **Time Range** | 0.001s to 999.9h (Switchable) | | **Terminal Type** | 11-pin Circular Socket / Pin terminals | | **IP Rating** | IP66 (Front panel protection against water/dust) | --- ### 2. Electronic Components & Features The device consists of several critical electronic sub-systems: #### A. Control Microprocessor At the heart of the unit is a dedicated microcontroller that handles timing logic, input signal processing, and display driving. This allows for high accuracy with a repetitive error rate of only **±0.005%**. #### B. The Display System * **7-Segment Backlit LCD:** Unlike standard LCDs, this model uses a high-contrast backlight. * **Color Switching:** The display can change color (Red/Green) based on the output status, providing visual confirmation of the process state at a distance. #### C. Input and Output (I/O) * **Signal Inputs:** It features electronic inputs for `START`, `STOP`, and `RESET`. These are typically NPN transistor inputs or no-voltage contact inputs. * **Electromechanical Relay:** The "R4" designation indicates a relay output. This physical switch allows the timer to control larger loads (solenoids, motors, or contactors) directly. #### D. Power Supply Circuit The internal circuitry includes a **switching mode power supply (SMPS)** or a robust transformer-less capacitive dropper (depending on the internal revision) to convert the 240V AC mains into low-voltage DC (5V/12V) for the digital logic. --- ### 3. Operating Modes The device is highly versatile due to its programmable operation modes, which are selected via DIP switches on the side or the front menu: 1. **ON-delay:** Starts timing when a signal is received; flips the relay after the set time. 2. **OFF-delay:** Relay flips immediately; starts timing to turn off after the signal is removed. 3. **Flicker (Oscillator):** Cycles the relay ON and OFF repeatedly based on the set time. 4. **Signal ON/OFF-delay:** Various combinations triggered by the input pulse. --- ### 4. Wiring Pinout (11-Pin Type) For the `AC240VS` model, the standard 11-pin configuration is: * **Pin 2 & 10:** Power Supply (100-240V AC). * **Pin 1, 3, 4:** Relay Contacts (Common, NO, NC). * **Pin 5, 6, 7:** Control Inputs (Reset, Stop, Start). * **Pin 11:** Common for control inputs.