The **M2UDS-C1-R** is a specific model within the M2 Series of **Digital Multi-Unit Power Transducers** manufactured by M-System. This device is designed to measure and convert AC power parameters into digital or analog signals for industrial monitoring. --- ### ## Technical Specifications The "C1-R" suffix indicates specific input and power configurations for this unit. | Feature | Specification | | :--- | :--- | | **Model Series** | M2UDS (Multi-Unit Power Transducer) | | **Input Type** | AC Voltage, AC Current, Active/Reactive Power | | **Configuration (C1)** | Single-phase / 2-wire system | | **Power Input (R)** | 24V DC | | **Output** | High-speed RS-485 (Modbus) / Analog options | | **Mounting** | DIN Rail Mounting | --- ### ### Key Electronic Components & Functionality The M2UDS-C1-R operates through several internal electronic stages: 1. **Input Conditioning Stage:** * **Potential Transformers (PT):** Stepped-down voltage inputs for safe measurement. * **Current Transformers (CT):** High-precision internal CTs to measure load current. 2. **Processing Unit:** * **A/D Converter:** Converts the analog sine waves into high-resolution digital data. * **Microprocessor:** Calculates True RMS voltage, current, active power ($W$), reactive power ($Var$), and power factor ($\cos\phi$). 3. **Isolation Barrier:** * The device features **triple isolation** (Input to Output to Power), typically rated at 2000V AC, protecting sensitive PLC or SCADA equipment from high-voltage surges. 4. **Communication/Output Module:** * Uses an **RS-485 transceiver** for Modbus RTU communication, allowing for daisy-chaining multiple units. --- ### ### Typical Connection Logic Below is a simplified representation of how the electronic terminals are wired: ```text Terminal | Function ---------|-------------------------- 1 - 2 | Auxiliary Power (24V DC) 5 - 6 | Voltage Input (V1, V2) 7 - 8 | Current Input (I1, I2) 11 - 13 | RS-485 (A, B, Shield) ``` --- ### ### Advantages of the M2 Series * **Ultra-Slim Design:** Only 5.9mm or 12.5mm wide (depending on specific housing), saving significant cabinet space. * **High Accuracy:** Generally provides accuracy within $\pm 0.5\%$. * **Configurability:** Settings such as VT/CT ratios can be programmed via a PC or hand-held programmer.