The **M2VF-0Z-R2/UL** is a high-performance **V/F (Voltage-to-Frequency) Converter** (also known as a signal conditioner or transmitter) manufactured by **M-System**. It is designed to convert a standard DC voltage input signal into a proportional pulse frequency output signal. --- ### ## Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Series** | M2 Series (Plug-in type) | | **Input Signal** | 0 – 10V DC (Standard for -0Z configuration) | | **Output Signal** | Open Collector (Pulse) | | **Power Input (R2)** | 11 – 27V DC | | **Approval (/UL)** | UL / cUL Class I, Division 2 | | **Accuracy** | ±0.1% | | **Response Time** | Max. 2.0 seconds (0 – 100%) | | **Mounting** | Surface or DIN rail | --- ### ### Core Electronic Components & Functions The device functions as an interface between analog sensors and digital controllers (like a PLC high-speed counter). 1. **Isolation Circuitry:** The device features **three-way isolation** (Input to Output to Power). This uses optoisolators or transformers to prevent ground loops and protect sensitive equipment from high-voltage surges. 2. **Voltage-to-Frequency Converter (VFC):** The internal integrated circuit (IC) takes the incoming 0-10V signal and generates a square wave or pulse train. The frequency of these pulses is directly proportional to the input voltage level. 3. **Open Collector Output:** The "0Z" designation typically refers to a pulse output. The output stage uses an **NPN transistor** (Open Collector). This acting as a switch, allowing the user to pull the voltage up to a level compatible with their specific logic controller (e.g., 5V, 12V, or 24V). 4. **Zero and Span Adjustments:** Located on the front panel, these potentiometers allow for fine-tuning the electronic offset (Zero) and the full-scale frequency (Span) to account for field calibration. --- ### ### Wiring Diagram Overview | Terminal No. | Connection Type | Description | | :--- | :--- | :--- | | 1 | Output (+) | Pulse Output (Collector) | | 2 | Output (-) | Pulse Output (Emitter) | | 4 | Input (+) | DC Voltage Input | | 5 | Input (-) | DC Voltage Input (Common) | | 7 | Power (U) | + Positive Supply | | 8 | Power (V) | - Negative Supply | --- ### ### Common Applications * **Totalizing Flow:** Converting an analog flow rate (GPM) into pulses for a totalizer to count total volume. * **Analog-to-Digital Interfacing:** Providing a digital pulse signal to a PLC that lacks an analog input card but has a high-speed counter input. * **Signal Isolation:** Protecting expensive control systems from electrical noise in industrial environments.