The **M2AC-AA3-R2/CE** is a high-performance **Signal Conditioner** (specifically a power transducer) manufactured by **M-System**. It is designed to convert an alternating current (AC) input into a standard, isolated DC output signal. --- ### 1. Key Technical Specifications The model name follows a specific configuration code that defines its electronic capabilities: | Feature | Specification | Description | | :--- | :--- | :--- | | **Model Series** | M2AC | AC Current Transducer (True RMS sensing) | | **Input (A)** | 0 – 5A AC | Standard current transformer (CT) input range | | **Output (A)** | 4 – 20mA DC | Standard process control current loop | | **Power Input (R2)** | 11/22V DC | Requires a 24V DC nominal power supply | | **Accuracy** | ±0.3% | High precision for industrial monitoring | | **Response Time** | ≤ 0.5 sec | Time to reach 90% of the output value | | **Compliance** | CE | Meets European safety and EMC standards | --- ### 2. Internal Electronic Design The device is composed of several critical electronic stages to ensure signal integrity: 1. **Input Conditioning (CT Transformer):** The 0-5A AC signal enters through an internal isolation transformer. This provides the first layer of galvanic isolation and steps down the current for processing. 2. **True RMS Converter:** Unlike basic transducers that measure peak values, this unit uses a **True RMS (Root Mean Square)** computing circuit. This allows it to accurately measure distorted waveforms or signals with harmonic noise. 3. **Isolation Barrier:** The device features **3-port isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges on the AC side. 4. **Amplification & Linearization:** The signal is converted to a highly linear DC voltage and then regulated into a 4-20mA current loop via an output driver. --- ### 3. Connection Diagram (Simplified) Below is the typical wiring logic for this electronic module: ```text [ AC SOURCE ] [ M2AC UNIT ] [ RECEIVER ] (CT) Terminal (PLC/DCS) | | | +----(5A Input)----> [1] [2] | | | +----(24V DC Pwr)--> [7] [8] | | | +----(4-20mA Out)--> [4] [5] ----------------+ ``` --- ### 4. Physical Characteristics * **Mounting:** Plug-in socket (standard for M-System M2 series). * **Housing:** Flame-resistant black resin. * **Adjustments:** Zero and Span adjustments are typically available on the front panel behind a cover for field calibration.