The **48AV-4GVH-R** refers to a high-performance fan assembly, typically manufactured by **Sanyo Denki** (San Ace line). It is a high-static pressure, high-airflow DC fan often used in server enclosures, telecommunications equipment, and industrial power supplies. --- ### Technical Specifications Below are the primary electronic and mechanical characteristics for the 48AV-4GVH-R: | Parameter | Specification | | :--- | :--- | | **Rated Voltage** | 48V DC | | **Operating Voltage Range** | 36V to 72V DC | | **Rated Current** | Approx. 0.35A - 0.50A (varies by sub-revision) | | **Rated Input** | ~17W - 24W | | **Rated Speed** | High RPM (typically >10,000 RPM) | | **Airflow** | High Static Pressure design | | **Bearing Type** | Dual Ball Bearing | | **Termination** | 4-Wire (Lead wires) | --- ### Internal Electronic Components The "48AV" series utilizes a sophisticated internal PCB to manage motor commutation and safety features. Key electronic parts include: 1. **Brushless DC (BLDC) Motor Controller:** An integrated circuit (IC) that manages the switching of the stator windings based on rotor position. 2. **Hall Effect Sensor:** A small magnetic sensor used to detect the position of the permanent magnet rotor for precise timing of the electronic commutation. 3. **PWM Control Circuitry:** Allows for external speed control. By varying the duty cycle of the input signal on the control wire, the fan speed can be adjusted dynamically to save power and reduce noise. 4. **Tachometer (Frequency Generator) Output:** A dedicated wire (usually yellow or white) that outputs a square wave signal proportional to the fan speed, allowing the host system to monitor for fan failure. 5. **Protection Electronics:** * **Locked Rotor Protection:** Automatically cuts power if the blades are obstructed to prevent the motor coils from burning out. * **Reverse Polarity Protection:** Prevents damage if the positive and negative leads are swapped during installation. --- ### Wiring Configuration This fan typically utilizes a 4-wire interface for advanced management: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | +48V | Main DC Power Supply | | **Black** | GND (0V) | Ground / Common | | **Yellow** | Sensor (Tach) | Speed feedback signal (2 pulses per revolution) | | **Brown/Blue** | PWM Control | Speed control input signal | --- ### Application Note Because this is a **48V** component, it is designed for industrial and telecom environments (standard 48V rails). It should **not** be connected to standard 12V PC headers, as it will either fail to start or provide negligible airflow. Conversely, applying 48V to a 12V system will result in immediate component failure.