The **FAN-7002-R** is a high-performance cooling fan module specifically designed for **Supermicro** server chassis and networking equipment. It is engineered for high-density environments where airflow and thermal management are critical for hardware longevity. --- ### 1. Technical Specifications The following table summarizes the primary electronic and physical characteristics of the FAN-7002-R: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Supermicro | | **Dimensions** | 40mm x 40mm x 28mm (Standard 4028) | | **Operating Voltage** | 12V DC | | **Rotational Speed** | Approx. 13,000 RPM | | **Airflow Capacity** | ~15.3 CFM (Cubic Feet per Minute) | | **Connector Type** | 4-Pin PWM (Pulse Width Modulation) | | **Bearing Type** | Dual Ball Bearing | --- ### 2. Electronic Components & Functionality The FAN-7002-R is more than just a motor; it contains integrated circuitry to communicate with the motherboard's BIOS/IPMI. #### A. The 4-Pin PWM Interface The 4-pin wiring provides sophisticated control over the fan's behavior: 1. **Ground (Black):** Common return path. 2. **Power (Red):** 12V DC input. 3. **Tachometer (Yellow/White):** Sends a pulse signal to the motherboard to monitor actual RPM. If the RPM drops below a threshold, the system triggers a "Fan Fail" alarm. 4. **PWM Control (Blue):** Allows the system to dynamically adjust fan speed based on thermal sensors. #### B. Brushless DC (BLDC) Motor Inside the housing is a brushless motor. Unlike brushed motors, BLDC motors use electronic commutation, which: * Reduces electromagnetic interference (EMI). * Increases lifespan (no brushes to wear out). * Operates more efficiently at high speeds. #### C. Dual Ball Bearing System The "R" in the part number often signifies a high-reliability revision. The dual ball bearing design is an essential electronic-mechanical choice because it allows the fan to operate at high temperatures (up to 70°C) and mounted in any orientation without leaking lubricant or failing prematurely. --- ### 3. Usage Context This specific fan is commonly found in **1U Rackmount Servers**. Because 1U servers have very limited vertical space (1.75 inches), the fan must rotate at extremely high speeds (13k+ RPM) to push enough static pressure through dense heatsinks and hard drive cages. ---