The **GMA-315-R** is a high-performance, incremental rotary encoder developed by Gausstec (or similar industrial sensor manufacturers). It is designed to convert mechanical rotary motion into electrical signals, typically used for position, speed, or angle sensing in automation. --- ### ## Technical Specifications Below is a breakdown of the core electronic and mechanical parameters: | Parameter | Specification | | :--- | :--- | | **Type** | Incremental Rotary Encoder | | **Output Phase** | A, B, Z (Index pulse) | | **Resolution** | Typically up to 5000 PPR (Pulses Per Revolution) | | **Supply Voltage** | 5V DC or 8-30V DC (Model dependent) | | **Output Type** | Push-Pull, NPN Open Collector, or Line Driver | | **Shaft Diameter** | 15mm (Hollow Shaft / Blind Hole) | | **Response Frequency** | 0 - 300 kHz | --- ### ### Key Electronic Components & Features 1. **Sensing Technology**: * It utilizes **Optical Sensing**. An internal LED shines through a glass or plastic disc with etched lines. As the disc rotates, a photo-detector captures the light pulses and converts them into square wave signals. 2. **Output Signals (A, B, Z)**: * **A and B Phase**: These are offset by 90° (Quadrature). This allows the controller to determine the **direction** of rotation. * **Z Phase**: Also known as the "Index" or "Reference" pulse. It triggers once per full revolution, providing a zero-point reference. 3. **Circuit Protection**: * The unit usually includes **Reverse Polarity Protection** and **Short-Circuit Protection** on the output stages to prevent damage during installation errors. 4. **Signal Integrity**: * The "R" in the suffix often denotes high-resolution or specific radial cable outlet configurations, ensuring low electromagnetic interference (EMI) via shielded cabling. --- ### ### Typical Wiring Configuration *Note: Always refer to the specific label on the device, as color codes can vary by manufacturing batch.* | Wire Color | Function | Description | | :--- | :--- | :--- | | **Brown** | Vcc | Power Supply (+) | | **Blue** | GND | Ground (0V) | | **Black** | Phase A | Main pulse signal | | **White** | Phase B | Quadrature signal (90° offset) | | **Orange** | Phase Z | Index pulse (once per turn) | | **Shield** | F.G | Frame Ground / Shielding | --- ### ### Applications * **Motor Feedback**: Monitoring the RPM of AC/DC motors. * **CNC Machinery**: Precise positioning of tool heads. * **Textile Industry**: Measuring fabric length or roller speed. * **Elevators**: Controlling floor leveling and door speed.