The **M2VF-3Z-R2/CE** is a high-performance **V/F (Voltage-to-Frequency) Converter** belonging to the M2 Series of signal conditioners manufactured by **M-System**. It is designed to convert a standard DC voltage input into a proportional pulse frequency output. --- ### 1. Key Technical Specifications The model code `M2VF-3Z-R2/CE` breaks down into specific electronic characteristics: | Component Code | Description | Details | | :--- | :--- | :--- | | **M2VF** | Model Series | V/F Converter (Plug-in base) | | **3** | Input Signal | 0 – 1V DC | | **Z** | Output Signal | Open Collector (Frequency range specified by user) | | **R2** | Power Input | 100 – 240V AC | | **CE** | Compliance | CE Marking (European Safety Standards) | --- ### 2. Functional Electronic Parts The internal circuitry of this device is composed of several critical stages: #### A. Input Isolation & Scaling * **Operational Amplifiers:** High-precision op-amps scale the 0-1V DC input signal. * **Isolation Transformer/Optocoupler:** Provides galvanic isolation between the input, output, and power supply (usually up to 2000V AC). This prevents ground loops and protects sensitive PLC/DCS equipment. #### B. V/F Conversion Core * **Integrator Circuit:** The DC voltage is fed into an integrator that charges a capacitor. * **Comparator & Reset:** Once the voltage reaches a threshold, a comparator triggers a pulse and resets the integrator. The frequency of this cycle is directly proportional to the input voltage. #### C. Output Stage (Open Collector) * **NPN Transistor:** The "Z" designation indicates an Open Collector output. It acts as a switch, typically rated for: * Max Voltage: 50V DC * Max Current: 50mA * **Pulse Width:** Usually fixed (e.g., 10ms, 50ms) or 50% duty cycle depending on the specific factory setting. --- ### 3. Electronic Performance Data | Feature | Specification | | :--- | :--- | | **Accuracy** | ±0.1% of span | | **Temp. Coefficient** | ±0.015% / °C | | **Response Time** | Max 3 seconds (0 to 100%) | | **Insulation Resistance** | 100 MΩ with 500V DC | | **Power Consumption** | Approx. 3VA at 100V AC | --- ### 4. Connection Diagram (Simplified) ```text [ Power L ] --- (1) (4) --- [ Pulse Out (+) ] [ Power N ] --- (2) (5) --- [ Pulse Out (-) ] [ Input + ] --- (7) [ Input - ] --- (8) ``` --- ### 5. Application Usage This electronic part is primarily used to: 1. **Totalize Flow:** Convert an analog flow rate (0-1V) into pulses for a counter. 2. **Digital Integration:** Sending high-speed signals to PLCs that lack high-resolution analog input cards but have high-speed counters. 3. **Signal Transmission:** Sending signals over long distances via frequency to minimize noise interference compared to low-voltage DC.