The **M2UDS2-K3-R2/CE** is a high-performance, compact **Digital Power Transducer** (specifically a Dual-Output Power Transducer) manufactured by **M-System**. It is designed to measure AC power and convert it into isolated DC signals suitable for industrial automation and control systems. --- ### 1. Core Technical Specifications The model name follows a specific nomenclature that defines its electronic characteristics: | Feature | Specification | | :--- | :--- | | **Primary Function** | AC Power Measurement (Active Power) | | **Configuration** | 3-phase, 3-wire system | | **Output 1** | 4 – 20 mA DC (Internal Load) | | **Output 2** | 1 – 5 V DC (Voltage Output) | | **Power Input** | 100 – 240V AC or 24 – 240V DC (Universal) | | **Isolation** | Input to Output 1 to Output 2 to Power | | **Certification** | CE Marking | --- ### 2. Key Electronic Components & Internal Workings The internal circuitry of the M2UDS2-K3-R2/CE consists of several critical stages: #### A. Input Stage (Sensing) * **Voltage Transformers (PTs):** Step down the line voltage (e.g., 110V/220V AC) to a low-level signal safe for processing. * **Current Transformers (CTs):** Convert high-line currents (usually 1A or 5A) into proportional low-current signals. #### B. Calculation Stage (DSP/Microprocessor) * The device utilizes a **Digital Signal Processor (DSP)** to perform high-speed sampling of the voltage and current waveforms. * It calculates **Active Power (Watts)** by multiplying instantaneous voltage and current and integrating them over time ($P = V \times I \times \cos \phi$). #### C. Output Stage (Isolation & Conversion) * **Optical Isolators:** These prevent electrical surges from the power lines from reaching the PLC/DCS side. * **Digital-to-Analog Converters (DAC):** Converts the calculated digital power value back into a precise analog signal (4-20mA or 1-5V). --- ### 3. Connection Diagram (Standard Wiring) Below is a simplified representation of the wiring terminal logic: ```text [Input Side] [M2UDS2 Unit] [Output Side] L1 (Voltage) --------> [ Terminal 1 ] L3 (Voltage) --------> [ Terminal 3 ] [ Terminal 12 ] (+) --> 4-20mA [ Terminal 13 ] (-) K (CT Current) ------> [ Terminal 5 ] L (CT Current) ------> [ Terminal 6 ] [ Terminal 14 ] (+) --> 1-5V DC [ Terminal 15 ] (-) [Power Supply] AC/DC Range ---------> [ Terminal 9/10] ``` --- ### 4. Industrial Applications * **Energy Management:** Monitoring real-time power consumption of industrial motors. * **SCADA Integration:** Sending power data to a Central Control Room via PLC analog input cards. * **Load Balancing:** Detecting phase imbalances or overloads in 3-phase machinery.