The **H2C-R** is a specific model of a **Motor-Driven Quartz Timer** manufactured by Omron. It is an electromechanical-electronic hybrid device used in industrial automation to control the timing of electrical circuits. Below is a detailed breakdown of its electronic and mechanical parts. --- ### 1. Core Component Breakdown | Component | Description | Function | | :--- | :--- | :--- | | **Quartz Crystal Oscillator** | The heart of the timing circuit. | Provides a high-frequency stable vibration for precise timekeeping. | | **Frequency Divider (IC)** | A specialized integrated circuit. | Scales down the high-frequency quartz pulses into usable time units (seconds/minutes/hours). | | **Synchronous Motor** | A small AC motor. | Converts electrical pulses into mechanical rotation to drive the display/gears. | | **Output Relay** | SPDT (Single Pole Double Throw) switch. | The physical interface that opens or closes the external load circuit. | | **Setting Dial** | Mechanical potentiometer/gear interface. | Allows the user to manually set the desired time duration. | --- ### 2. Electronic Operating Principle The H2C-R operates through a multistage process: 1. **Signal Generation:** The internal quartz crystal oscillates at a specific frequency when voltage is applied. This is significantly more accurate than standard RC (Resistor-Capacitor) timers. 2. **Processing:** The internal IC counts these oscillations. Once the count matches the setting determined by the front dial, the IC sends a signal to the motor or the output trigger. 3. **Mechanical Actuation:** The motor drives a gear train that moves the "time elapsed" pointer. 4. **Output Switching:** Once the pointer reaches the zero point or the set point (depending on the mode), a mechanical cam triggers the internal relay, switching the contacts from **NO (Normally Open)** to **NC (Normally Closed)**. --- ### 3. Technical Specifications | Feature | Specification | | :--- | :--- | | **Mounting Type** | Surface, Flush, or DIN Track | | **Terminal Type** | 8-Pin or 11-Pin (depending on sub-model) | | **Operating Voltages** | 100/110/120 VAC or 200/220/240 VAC | | **Time Ranges** | Multi-range (typically 0.2s to 30h) | | **Reset System** | Power-off reset or external signal reset | --- ### 4. Circuit Diagram Representation (Simplified) ```text [ Power Input ] ----> [ Rectifier/Regulator ] ----> [ Quartz Oscillator ] | [ Frequency Divider IC ] | [ Output Load ] <---- [ Relay Contacts ] <--------- [ Driver Motor ] ``` --- ### 5. Key Advantages of the H2C-R Design * **High Repeat Accuracy:** Because it uses a quartz oscillator, the error margin is extremely low (typically $\pm0.2\%$). * **Visual Feedback:** Unlike digital timers, the H2C-R provides a moving pointer, allowing operators to see exactly how much time remains at a glance. * **Noise Immunity:** The mechanical nature of the output makes it less susceptible to electromagnetic interference (EMI) compared to pure solid-state relays.