The Hoffman Controls 710-VDC Motor Speed Controller is a high-performance electronic solution for contractors requiring precise proportional motor speed control for PSC and shaded pole motors. Engineered for multi-voltage applications, this unit seamlessly integrates into 115V and 208-230V systems without derating up to 10 Amps. It utilizes an industry-standard 2-10VDC input signal, typically sourced from a building automation system (BAS) or PLC, to adjust fan speeds for optimal temperature, pressure, or air volume. A critical feature for HVAC blower fan speed control is the integrated full-voltage torque start, which delivers a high-voltage pulse to overcome the initial inertia of blower wheels before transitioning to the modulated speed. For ventilation and air handling systems, the built-in minimum speed adjustment (100?800 RPM range) and continuous flow switch ensure essential airflow is maintained even when the control signal falls below the 2VDC threshold, preventing motor stall and unwanted shutdowns. Key Benefits Universal Motor Compatibility: Specifically designed to handle single-phase PSC (Permanent Split Capacitor) and shaded pole motors used in direct-drive blower or propeller fan applications. Dynamic Range Control: Accepts a proportional 2-10VDC signal for linear speed adjustment, ensuring stable environmental conditions in commercial settings. Enhanced Reliability: The full-voltage torque start prevents motor hum and startup failures by providing the necessary initial power for fan rotation. Application Versatility: Supports both 115V and 230V circuits, simplifying inventory by serving as a single replacement part for various HVAC motor controllers. Advanced Protection: Rated for up to 10 Amps continuous current and 30 Amps locked rotor current (LRA) to handle high-demand industrial startups. Common Questions What is the purpose of the Continuous Flow switch on the 710-VDC? The continuous flow switch allows the fan motor to continue running at the user-defined minimum speed even if the control signal drops below 2.0 VDC. This is essential for maintaining minimum ventilation requirements or preventing stagnant air in specialized zones. Does the 710-VDC require a separate power source? Yes, the controller requires an external 24VAC power supply (1.0 VA). For proper operation, the 24VAC source must be in phase with the line voltage supplied to the fan motor. The transformer primary should be connected to the same contactor terminals as the motor. Can I use this controller with ECM or 3-phase motors? No, the 710-VDC is strictly designed for PSC and shaded pole motors. For ECM or 3-phase applications, different Hoffman Controls 700 or 800 series models would be required to ensure component compatibility. 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.
