The **M2UDS2-K0-R/N** is a specific model of a **Plug-in Digital Multi-Unit** (Multi-Power Monitor) manufactured by **M-System** (now part of MG CO., LTD). It is designed to measure and monitor various electrical parameters in power distribution systems. --- ### 1. Key Technical Specifications The model string identifies the hardware configuration and input/output capabilities: | Feature | Specification | | :--- | :--- | | **Model Series** | M2UDS2 (Multi-Power Monitor) | | **Input Type** | 3-phase, 3-wire system (Standard) | | **Current Input** | 1A / 5A AC (selectable via CT) | | **Voltage Input** | 110V / 220V AC | | **Power Supply** | 100 – 240V AC or 108 – 264V DC | | **Output Type** | Modbus-RTU (RS-485) and Analog Outputs | --- ### 2. Functional Electronic Components The unit is composed of several sophisticated electronic subsystems to ensure high-precision measurement: * **A/D Conversion Circuitry:** High-resolution Analog-to-Digital converters handle the simultaneous sampling of voltage and current waveforms to calculate True RMS values. * **Microprocessor (MCU):** An onboard processor calculates active power, reactive power, apparent power, power factor, and frequency based on the raw sampled data. * **Isolation Barrier:** Optical or magnetic isolation is used between the high-voltage inputs and the low-voltage communication/output ports to ensure safety and signal integrity. * **Communication Interface:** Features an RS-485 transceiver supporting the Modbus-RTU protocol for integration into PLC or SCADA systems. * **Display Module:** A built-in LCD or LED display (depending on the specific chassis) provides local readout of measured values. --- ### 3. Parameters Measured This electronic part is capable of calculating and transmitting the following data points: 1. **Voltage:** (V12, V23, V31) 2. **Current:** (I1, I2, I3) 3. **Power:** Active (kW), Reactive (kvar), Apparent (kVA) 4. **Energy:** Active (kWh), Reactive (kvarh) 5. **Quality:** Power Factor (cos φ) and Frequency (Hz) --- ### 4. Wiring and Terminal Layout Standard electronic integration requires following this general pin configuration: ```text Terminal | Function ---------|--------------------------- 1 - 2 | Auxiliary Power Supply 3 - 4 | Voltage Input (U1, U2) 5 - 6 | Current Input (I1) 7 - 8 | RS-485 (A, B) Communication ``` ---