The part number **48V-1RGHA-R** refers to a high-performance **Brushless DC (BLDC) Cooling Fan**, typically manufactured by **Sanyo Denki** (San Ace series). These fans are engineered for high-density cooling in industrial and server environments. --- ### 1. Technical Specifications The table below outlines the primary electronic and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Nominal Voltage** | 48V DC | | **Operating Voltage Range** | 36V to 72V DC | | **Current Rating** | ~0.5A to 1.1A (model dependent) | | **Power Consumption** | ~24W - 53W | | **Speed (RPM)** | High Speed (up to 10,000+ RPM) | | **Airflow** | High Static Pressure / High CFM | | **Dimensions** | Standard frame (often 40mm, 60mm, or 80mm square) | | **Bearing Type** | Dual Ball Bearing | --- ### 2. Key Electronic Components & Features The "R" suffix and "GHA" designation often indicate specific electronic control features: * **PWM Control (Pulse Width Modulation):** Allows the system to control the fan speed dynamically by varying the duty cycle. This reduces noise and power consumption when full cooling capacity is not required. * **Tachometer Output (Locked Rotor Sensor):** Usually includes a "Pulse Sensor" (Yellow wire) that sends a signal to the motherboard/controller to monitor the actual RPM and detect if the fan has stalled. * **Internal Commutation IC:** The motor contains an integrated circuit that handles the switching of the electromagnetic coils, ensuring smooth rotation without the friction of carbon brushes. * **Protection Circuits:** * **Reverse Polarity Protection:** Prevents damage if the positive and negative leads are swapped. * **Locked Rotor Protection:** Automatically cuts or reduces power if the blades are obstructed to prevent the motor coils from burning out. --- ### 3. Lead Wire Configuration Typically, this fan utilizes a 4-wire interface: 1. **Red (+):** 48V Power Supply. 2. **Black (-):** Ground. 3. **Yellow:** Sensor Output (Tachometer/RPM). 4. **Blue/Brown:** PWM Control Input. --- ### 4. Common Applications * **Telecommunications:** Cooling for 48V DC rack-mounted equipment. * **Server Centers:** High-density blade servers requiring high static pressure. * **Industrial Inverters:** Cooling for large power conversion systems.