The **MA28TAX-R** is a specific model within the **MA series of high-performance AC axial fans**, typically manufactured by companies like **Oriental Motor**. These components are designed for industrial-grade cooling and ventilation. --- ### 1. Key Technical Specifications The "MA28TAX-R" designation refers to specific electrical and physical characteristics. Below is a breakdown of its core components: | Feature | Specification (Typical) | | :--- | :--- | | **Input Voltage** | 100V - 230V AC (Wide Range/Multi-voltage) | | **Frame Size** | 119mm x 119mm (Standard Square) | | **Thickness** | 38mm | | **Bearing Type** | Dual Ball Bearing (Long Life) | | **Material** | Aluminum Frame / Polycarbonate Impeller | | **Speed Type** | High Speed (Standard T-Class) | --- ### 2. Electronic Component Breakdown The "R" suffix and internal circuitry indicate several sophisticated electronic features: #### A. Power Conversion Unlike simple AC fans, the MA28TAX-R often utilizes an internal **AC-to-DC conversion circuit**. This allows the fan to: * Maintain consistent airflow regardless of frequency fluctuations (50Hz vs 60Hz). * Operate across a wide global voltage range without needing a transformer. #### B. The "R" Suffix: Low-Speed Alarm The **-R** in the part number specifically denotes the inclusion of a **Low-Speed Alarm (Contact Output)**. * **Mechanism:** An internal sensor monitors the RPM of the impeller. * **Function:** If the fan slows down below a specific threshold (due to dust buildup or motor failure), the internal circuit closes/opens a dedicated signal wire. * **Usage:** This is connected to a PLC or system controller to trigger an emergency shutdown or maintenance alert. #### C. Motor Technology * **Type:** Brushless motor design integrated into an AC housing. * **Thermal Protection:** Includes a built-in "Thermal Protector" or impedance protection to prevent the windings from catching fire if the rotor is locked (stalled). --- ### 3. Wiring Configuration Typically, this part features a 3-wire or 4-wire setup depending on the terminal type: 1. **L (Live):** AC Power Input. 2. **N (Neutral):** AC Power Input. 3. **Alarm Leads (2 wires):** These are the output for the "R" (Low-Speed) alarm signal. --- ### 4. Typical Applications Due to its reliability and the alarm feature, it is found in: * **Server Racks:** High-density cooling where failure must be detected immediately. * **Industrial Control Panels:** Protecting sensitive PLCs and Inverters. * **Medical Equipment:** Where thermal management is critical for safety.