## Technical Overview: RFT-24E-R Electronic Signal Tower The **RFT-24E-R** is a specific model of electronic signal tower (often referred to as a "Rotating Resonant" light) manufactured by **Patlite**. It combines visual LED signaling with an integrated audible alarm, designed for industrial automation environments. ### 1. Model Breakdown The nomenclature reveals the core electronic specifications: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **RFT** | Series Name | LED Rotating Light with Integrated Alarm | | **24** | Voltage | 24V AC/DC Operation | | **E** | Functionality | European Standard / Standard Model | | **R** | Color | Red LED / Globe | --- ### 2. Key Electronic Components & Features #### A. The Light Source (LED Module) Unlike traditional rotating lights that use a mechanical motor and a halogen bulb, the RFT series typically utilizes: * **High-Intensity LEDs:** Arrayed to provide 360-degree visibility. * **Solid-State Rotation:** Instead of a physical motor spinning a mirror, the electronics sequence the LEDs to pulse in a pattern that simulates rotation. This eliminates mechanical wear and increases the lifespan of the device. #### B. The Acoustic System (Alarm) * **Built-in Tones:** The "E" version usually includes multiple selectable tones (e.g., rapid intermittent, continuous, or siren). * **Sound Pressure:** Capable of outputting up to **90dB** at 1 meter. * **Volume Control:** Internal potentiometer or dip-switches allow for volume attenuation. #### C. Control Interface (Wiring) The device is operated via a multi-wire cable. The electronic logic allows for: * **Independent Control:** The light and the buzzer can be triggered separately or simultaneously depending on which lead wires are energized. * **NPN/PNP Compatibility:** The internal circuitry is designed to be compatible with most PLC (Programmable Logic Controller) outputs, supporting both "sink" and "source" transistor logic. --- ### 3. Electrical Specifications | Parameter | Value | | :--- | :--- | | **Rated Voltage** | 24V AC/DC | | **Operating Voltage Range** | 21.6V – 26.4V DC | | **Power Consumption** | Approx. 3.5W - 5.0W (depending on alarm use) | | **Protection Rating** | IP54 (Dust and Splash resistant) | | **Vibration Resistance** | 19.6 m/s² | --- ### 4. Application Logic The electronics are housed in a **polycarbonate resin** globe and an **ABS resin** body. In an industrial circuit, the RFT-24E-R acts as an output actuator. When the 24V signal is applied to the specific color wire, the internal PCB (Printed Circuit Board) regulates the current to the LED array and triggers the piezoelectric transducer for the sound. ---