The **REB-AC-R/Q** refers to a high-performance speed controller (Governor) typically used for AC motors, such as those found in industrial fans, ventilation systems, and heat recovery units (specifically brands like S&P - Soler & Palau). ### 1. Technical Specifications The device is designed to regulate the speed of single-phase motors by varying the voltage. | Component / Parameter | Specification | | :--- | :--- | | **Input Voltage** | 230V AC (Single Phase) | | **Frequency** | 50/60 Hz | | **Max Current** | Generally 1A to 5A (depending on sub-model) | | **Protection Rating** | IP44 or IP54 (depending on housing) | | **Control Method** | Phase Angle Control (Triac-based) | --- ### 2. Core Electronic Components The internal circuitry of the REB-AC series relies on power electronics to handle high-voltage AC loads. * **TRIAC (Triode for Alternating Current):** The "heart" of the device. It acts as a high-speed solid-state switch that chops the AC sine wave to reduce the effective voltage delivered to the motor. * **Potentiometer:** The user-facing dial. It adjusts the RC (Resistor-Capacitor) time constant, which determines the "firing angle" of the Triac. * **DIAC (Diode for Alternating Current):** Used to trigger the Triac symmetrically, ensuring the motor doesn't hum or vibrate excessively at low speeds. * **RFI Filter (Inductors and X-Capacitors):** These parts suppress Radio Frequency Interference. Without them, the high-speed switching of the Triac would cause noise in nearby electronic devices (TVs, Radios). * **Trimmer (Minimum Speed Adjustment):** A small internal screw-potentiometer used to set the lowest possible voltage so the motor doesn't stall when the main dial is at its lowest setting. --- ### 3. Functional Differences (R vs. Q) While sharing the same basic electronics, the letters often denote the physical form factor: 1. **REB-AC-R (Surface Mount):** Usually comes with a full plastic enclosure for wall mounting. 2. **REB-AC-Q (Flush/In-wall):** Designed to be integrated into standard electrical switch boxes, often featuring a cleaner "built-in" aesthetic. ### 4. Wiring and Safety Parts * **Fuse:** Most models include a ceramic fast-acting fuse to protect the Triac from over-current or short circuits. * **L / N Terminals:** Standard Line (Brown) and Neutral (Blue) inputs. * **L1 (Regulated Output):** The terminal that sends the modified voltage to the fan motor. ---