## Electronic Components of the FNS-150-R The **FNS-150-R** is an industrial-grade **Single-Phase Automatic Voltage Regulator (AVR)**, typically used to protect sensitive electronic equipment from voltage fluctuations, surges, and electrical noise. Below is a breakdown of its primary electronic parts and their functions. --- ### Core Electronic Components | Component | Function | Description | | :--- | :--- | :--- | | **Servo Motor** | Mechanical Adjustment | A high-torque DC motor that physically moves the carbon brush across the transformer windings to adjust the voltage. | | **Microprocessor Control PCB** | "The Brain" | An integrated circuit board that monitors input voltage and sends signals to the servo motor to compensate for fluctuations. | | **Toroidal Transformer** | Voltage Induction | A ring-shaped transformer that provides high efficiency and low electromagnetic interference (EMI) for voltage stepping. | | **Carbon Brush** | Contact Interface | A conductive element attached to the servo arm that slides along the transformer coils to change the turn ratio. | | **Limit Switches** | Safety Mechanism | Small switches that prevent the servo motor from rotating past its physical safety limits. | | **Relay/Contactor** | Power Switching | Used for time-delay functions and high-voltage protection to disconnect the load during extreme spikes. | --- ### Key Technical Systems ### 1. The Feedback Control Loop The FNS-150-R utilizes a **closed-loop feedback system**. * **Sensor:** Monitors the output voltage in real-time. * **Comparator:** The PCB compares the actual output to the target (e.g., 220V). * **Driver:** If a discrepancy is found, the driver activates the Servo Motor to shift the Carbon Brush until the target voltage is reached. ### 2. Protection Circuits The electronic assembly includes several layers of safety: * **Over-Voltage/Under-Voltage Protection:** If the input voltage exceeds or drops below the operational range (e.g., <160V or >260V), the PCB triggers a relay to cut power to the load. * **Short Circuit Protection:** Usually handled via an integrated **Circuit Breaker** (MCB) located on the chassis. * **Time-Delay Function:** A logic circuit that prevents the device from sending power immediately after a blackout, protecting compressors (like in refrigerators) from back-pressure damage. --- ### Display and Indicators Most FNS-150-R models feature an analog or digital monitoring interface: * **Voltmeter:** Displays the regulated output voltage. * **Ammeter:** Displays the current load being drawn. * **LED Indicators:** * *Green:* Normal Operation. * *Yellow:* Delaying start. * *Red:* Fault/Unusual Voltage. ---