The **M2AC-AD1-R2** is a high-performance signal conditioner (transmitter) manufactured by **M-System**. It is primarily designed to convert an alternating current (AC) input into a standard instrumentation DC output signal. --- ### 1. Core Technical Specifications | Feature | Specification | |:---|:---| | **Model Type** | M2 Series Signal Conditioner | | **Input Signal** | 0 – 1 A AC or 0 – 5 A AC (User specified) | | **Output Signal** | 4 – 20 mA DC or 0 – 10 V DC (Depending on configuration) | | **Power Input (R2)** | 100 – 240V AC | | **Accuracy** | ±0.3% | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Mounting** | DIN Rail | --- ### 2. Key Electronic Components & Functionality The M2AC-AD1-R2 operates through three primary internal stages to ensure signal integrity and safety: #### A. Input Stage (AC Sensing) The device utilizes an internal current transformer or a precision shunt resistor to sample the AC current. It is designed for **RMS (Root Mean Square)** or average-sensing conversion, allowing it to handle standard sine waves effectively. #### B. Isolation Circuitry The "M2" series is known for its high dielectric strength. The device provides **three-way isolation**: * **Input to Output** * **Input to Power** * **Output to Power** This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges on the AC line. #### C. Output Conditioning The internal circuitry converts the processed signal into a linear DC output. This stage includes: * **Zero and Span Adjustments:** Potentiometers located on the front of the unit for field calibration. * **Filtering:** To ensure the output signal is stable and free from AC ripple. --- ### 3. Connection Terminal Map | Terminal No. | Function | Description | |:---:|:---|:---| | **1 & 2** | Output (+) / (-) | Connection to PLC, Controller, or Indicator. | | **4 & 5** | Power Supply | 100–240V AC Source. | | **7 & 8** | Input (U / V) | AC Current Input (from CT or Source). | --- ### 4. Application Use Case This part is commonly used in **Motor Control Centers (MCC)**. For example, it monitors the current draw of a large industrial motor. The M2AC-AD1-R2 takes the high AC amperage (stepped down via a CT) and converts it into a 4-20mA signal that a control system can use to detect overloads or mechanical jams.