The **M2AC-AD2-R/CE** is a high-performance, compact plug-in signal conditioner (specifically an AC Isolator) manufactured by **M-System**. It is designed to convert an AC current input into a standard DC output signal. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Series** | M2 Series (Mini-M) | | **Input Type** | AC Current (0 – 1A or 0 – 5A AC) | | **Output Type** | DC Current or Voltage (Configurable) | | **Power Input** | 200 – 240V AC | | **Accuracy** | ±0.3% | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation** | 3-way isolation (input to output to power) | | **Construction** | Plug-in style (socket mounted) | --- ### 2. Electronic Components & Functionality The device consists of several internal electronic stages to ensure signal integrity and safety: #### A. Input Stage (Sensing) * **Current Transformer (CT):** The input signal is typically stepped down and isolated via an internal precision CT. * **Rectifier Circuit:** Converts the AC input into a pulsating DC signal. Since this is an "Average Sensing" model (indicated by the AD2 suffix), it filters the AC to find the mean value, which is then calibrated to the RMS of a sine wave. #### B. Isolation Barrier * **Optical or Magnetic Coupling:** The M2 series utilizes 3-way isolation. This prevents high-voltage surges on the input side from damaging the PLC/DCS (output side) or the power supply. #### C. Output Stage (Conditioning) * **Operational Amplifiers (Op-Amps):** Used to scale the rectified signal to the desired DC range (e.g., 4-20mA or 0-10V). * **Zero/Span Adjustments:** Potentiometers accessible on the front panel allow for fine-tuning the electronic calibration. --- ### 3. Suffix Breakdown (Model Code) * **M2AC:** AC Input Signal Conditioner. * **AD2:** Input range code (typically 0–5A AC) and Average Sensing type. * **R:** Power Supply requirement (100–240V AC). * **CE:** Conformité Européenne (Indicates the device meets EU safety, health, and environmental protection requirements). --- ### 4. Mounting and Wiring The unit uses a **11-pin base socket** for easy maintenance. Because it is a "plug-in" type, the electronic module can be replaced without disconnecting the field wiring from the base. ```text Wiring Diagram Simplified: Terminal 1 & 2: AC Input (from CT) Terminal 4 & 5: DC Output (to Controller) Terminal 7 & 8: Power Supply (200-240V AC) ```