The Hoffman Controls 792-ECM Controller is a professional-grade solution for modulating the speed of high-efficiency ECM brushless DC motors. Engineered for variable air volume (VAV) applications, this ECM speed controller provides precise proportional speed control based on a 2-10VDC or 4-20mA DC input signal. It is line voltage independent, requiring only a 24VAC power source, and utilizes pulse width modulation (PWM) at 80Hz to regulate motor RPM from 0% to 100%. The unit features a manual speed adjustment potentiometer, which allows technicians to set a minimum continuous flow bias or calibrate flow during system commissioning. Designed for air-moving equipment like centrifugal blowers and propeller fans, the 792-ECM includes a dedicated motor enable signal (GO signal) to ensure synchronized operation between the controller and the motor electronics. Key Benefits Compatible with a wide range of energy-efficient ECM motors via standard PWM control signal input. Supports dual input types: 2-10VDC and 4-20mA for seamless integration with building automation systems (BAS). Included manual override potentiometer simplifies air flow balancing and troubleshooting in the field. Compact 2.50÷ x 3.00÷ footprint allows for easy installation within tight electrical enclosures or motor junction boxes. Input impedance of 10,000 Ohms (VDC) and 500 Ohms (mA) ensures minimal signal loading on the master controller. Common Questions Can the 792-ECM drive multiple motors? The output current capacity is 5mA, which is typically sufficient to drive a single motor input. For multiple motors, verify total signal current draw to prevent overloading the output. How does the manual adjustment interact with the 0-10V signal? The manual adjustment acts as a bias. If the input signal drops below the manual setting, the controller will maintain the speed at the manual setpoint rather than turning the motor off. Does this controller require high voltage wiring? No, it is line voltage independent and operates on a standard 24VAC Class 2 transformer power supply. This item is not eligible for free shipping. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
