The **M2AC-AA4W-R2** is a specific part number belonging to the **M2 Series** of Signal Conditioners manufactured by **M-System** (now often branded under **MG CO., LTD.**). These devices are used in industrial automation to convert, isolate, and transmit electrical signals. Below is a breakdown of the electronic specifications and characteristics based on the part number nomenclature. --- ### 1. Part Number Deciphering The alphanumeric code indicates the specific hardware configuration of the module: | Segment | Code | Description | | :--- | :--- | :--- | | **Series** | M2 | M2 Series Signal Conditioner (Plug-in base) | | **Model** | AC | AC Transmitter (converts AC voltage/current to DC) | | **Input** | AA | 0 – 5 A AC (Current Input) | | **Output** | 4W | 4 – 20 mA DC (Current Output) | | **Power Supply**| R2 | 110V AC / 220V AC (Selectable) | --- ### 2. Key Electronic Components & Functions The internal circuitry of this device is designed for high-precision industrial environments. Key electronic features include: * **CT (Current Transformer) Input:** Since the input is 5A AC, the device contains an internal step-down transformer or a precision shunt to sample high AC current safely. * **Galvanic Isolation:** This module provides **three-way isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges on the AC line. * **AC-to-DC Conversion (Rectification):** The electronic core converts the AC sinusoidal wave into an RMS-calibrated or average-sensing DC signal. * **Zero/Span Adjustment:** On the front panel, there are typically two potentiometers (trimmer resistors) that allow for fine-tuning the 4mA (zero) and 20mA (span) output points. --- ### 3. Technical Specifications Typical performance metrics for the M2AC series: | Parameter | Specification | | :--- | :--- | | **Accuracy** | ±0.3% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Insulation Resistance** | 100 MΩ or more (500V DC) | | **Isolation Strength** | 2000V AC @ 1 minute | | **Load Resistance** | Max 750 Ω for 4-20mA output | | **Frequency Range** | 40 Hz to 1 kHz | --- ### 4. Wiring Diagram Overview The device uses a **socket-mount (8-pin or 11-pin)** base. ```text Input (AC 5A): Terminals 1 & 8 Output (4-20mA): Terminals 4(+) & 5(-) Power Supply: Terminals 2 & 3 ``` *(Note: Always verify with the specific wiring label on the side of the actual unit before energizing.)* ---