The **M2AC-A61-R** is a specific model within the **M2AC series** of Signal Conditioners/Transmitters manufactured by **M-System**. This device is primarily used in industrial automation to convert AC current signals into isolated DC output signals. --- ### 1. Technical Specifications Table The model number breakdown reveals the specific electronic characteristics of the unit: | Component | Code/Value | Description | | :--- | :--- | :--- | | **Model Series** | M2AC | AC Current Transmitter (Mini-M series) | | **Input Signal** | **A** | 0 – 1 A AC | | **Output Signal** | **6** | 1 – 5 V DC | | **Power Input** | **1** | 100 – 120 V AC | | **Operational Option** | **R** | Standard Response (approx. 0.5s) | --- ### 2. Electronic Parts & Internal Architecture The M2AC-A61-R is composed of several critical electronic stages that ensure signal integrity and safety: #### A. Input Stage (Current Transformer) * **Sensing:** It uses an internal precision current transformer (CT) to step down the 1A AC input. * **Burden:** Designed with low input impedance to prevent loading effects on the primary current loop. #### B. Rectification and Conditioning * **RMS-to-DC Converter:** Converts the AC waveform into a proportional DC voltage. * **Filtering:** Capacitors and active filters smooth the rectified signal to remove AC ripple, ensuring a steady DC output. #### C. Isolation Barrier * **Optical or Transformer Isolation:** This is the "core" of the device. It provides 3-way isolation (Input to Output to Power). * **Purpose:** Protects sensitive PLC/DCS inputs from high-voltage surges or ground loops present on the AC line. #### D. Output Driver * **Voltage Regulation:** Converts the internal processed signal into the final **1 – 5 V DC** range. * **Short-circuit Protection:** Includes electronic limiting to prevent damage if the output terminals are shorted. --- ### 3. Connection Diagram (General) The unit typically uses a **socket-mounted** design for easy maintenance. ```mermaid graph LR A[AC Current 0-1A] --> B[M2AC Transmitter] B --> C[DC Output 1-5V] D[Power 110V AC] --> B ``` ### 4. Key Electronic Features * **Accuracy:** Typically ±0.3% of span. * **Isolation Resistance:** 100 MΩ or more with 500V DC. * **Dielectric Strength:** 2000V AC @ 1 minute (Input to output to power to ground). * **Housing:** Flame-resistant resin (UL 94V-0).