## Technical Overview of AFB0824SH-R00 The **AFB0824SH-R00** is a high-performance DC axial fan manufactured by **Delta Electronics**. It is part of the AFB series, known for its reliability and use of ball bearings to ensure longevity. --- ### Core Technical Specifications | Parameter | Specification | | :--- | :--- | | **Frame Size** | 80mm x 80mm x 25.4mm | | **Rated Voltage** | 24 VDC | | **Operating Voltage Range** | 14.0 to 27.6 VDC | | **Rated Current** | 0.22 A (Max 0.33 A) | | **Input Power** | 5.28 W | | **Speed** | 4000 RPM | | **Max Air Flow** | 46.62 CFM (1.320 m³/min) | | **Max Air Pressure** | 6.78 mmH₂O (0.267 inH₂O) | | **Noise Level** | 40.0 dB-A | | **Bearing Type** | Dual Ball Bearing | --- ### Electronic Components & Wiring The "R00" suffix in the model number designates a specific electronic output feature: the **Locked Rotor Sensor (Sensor Signal)**. #### 1. Internal Motor Circuitry * **Brushless DC (BLDC) Motor:** The fan uses a 3-phase or single-phase permanent magnet motor driven by an internal electronic commutation circuit. * **Auto-Restart:** The internal IC includes a feature that protects the motor if the blades are obstructed. It will attempt to restart periodically once the obstruction is removed. * **Polarity Protection:** Usually includes an internal diode to prevent damage if the positive and negative leads are reversed. #### 2. Wire Configuration (3-Wire Interface) The unit typically features three color-coded wires: 1. **Red (+):** Positive power supply (24V). 2. **Black (-):** Ground (0V). 3. **White (R00):** This is the **Lock Sensor Signal**. #### 3. The "R00" Signal Function (Alarm) Unlike a Tachometer (FG) signal that pulses with speed, the **R00 signal** acts as a logic switch: * **Normal Operation:** The signal stays at a "Low" voltage level while the fan is spinning. * **Fan Failure (Locked Rotor):** If the fan stops rotating, the internal transistor turns off, and the signal goes "High" (pulled up to the supply voltage). * **Purpose:** This allows a system controller to trigger an immediate alarm if the cooling fan fails. --- ### Materials and Durability * **Impeller & Frame:** Plastic (UL 94V-0), which is flame retardant. * **Life Expectancy:** Approximately 70,000 hours at 40°C, thanks to the high-quality dual ball bearing system.