The **W2AC-A2DD-R/N** is a specific model identifier typically associated with **Moxa** industrial networking equipment, specifically within the **AWK series** (Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client) or its power supply accessory line. This specific alphanumeric code refers to a **Power Supply Unit (PSU)** module designed for high-availability industrial chassis. --- ### 1. Technical Specifications Below are the primary electronic characteristics of the W2AC-A2DD-R/N module: | Component / Feature | Specification Details | | :--- | :--- | | **Device Type** | Redundant Power Supply Module | | **Input Voltage (AC)** | 100 to 240 VAC (Universal Range) | | **Input Voltage (DC)** | 110 to 220 VDC | | **Output Type** | Dual DC Output (Redundant Architecture) | | **Mounting** | Rackmount / Chassis integrated | | **Operating Temp** | Standard 0 to 60°C (Standard model) | --- ### 2. Key Electronic Parts & Functionality #### A. Power Conversion Stage * **AC-DC Rectification:** Uses a bridge rectifier circuit to convert incoming AC utility power into high-voltage DC. * **Switch-Mode Power Supply (SMPS):** Employs high-frequency switching transistors (MOSFETs) and a transformer to step down the voltage efficiently with minimal heat dissipation. #### B. Redundancy Logic (The "R" Suffix) * **ORing Diodes/FETs:** The module includes "ORing" circuitry. This allows two power modules to be connected to the same load. If one module fails, the other takes over instantly without a power drop (Zero-millisecond switchover). * **Current Sharing:** Electronic controllers ensure that if two modules are active, the load is balanced between them to extend the lifespan of the components. #### C. Protection Circuits The internal PCB (Printed Circuit Board) contains several critical protection components: * **Over-Voltage Protection (OVP):** Shuts down the output if the voltage exceeds safety limits to protect the connected industrial switch. * **Short Circuit Protection (SCP):** Uses a polyfuse or electronic breaker to prevent fire hazards during a short. * **EMI/EMC Filtering:** Includes Inductors (Chokes) and X/Y Capacitors to filter out electromagnetic interference, ensuring the unit complies with industrial noise standards. --- ### 3. Physical Interface The "A2DD" in the nomenclature often refers to the connector configuration: * **Input:** Standard AC Inlet or Terminal Block. * **Output:** Proprietary pin-header designed to slide into a backplane (Modular design). * **Monitoring:** Includes a "Relay Output" or "Fault Contact" that triggers an alarm if power input is lost. ---