Belimo LMX120-SR Actuator

The Belimo LMX120-SR is a professional-grade modulating rotary actuator engineered for precise control of HVAC dampers and air-handling unit components. This non-spring return actuator delivers a constant 45 in-lb (5 Nm) torque across a 95° rotation range, making it a reliable choice for VAV terminal units and small-to-medium damper assemblies. Designed for high efficiency, the LMX120-SR utilizes a 2 to 10 VDC control signal and features a universal power supply compatible with 100 to 240 VAC. The brushless DC motor is controlled by an Application Specific Integrated Circuit (ASIC), which monitors and adapts the motor's rotation to provide consistent torque and timing while protecting against electronic overloads. This eliminates the need for limit switches, increasing long-term field reliability. Field-adjustable features include a selectable direction of rotation and a manual override push button for easy commissioning and troubleshooting in building automation systems.

Key Benefits for Contractors

• Universal Compatibility: Wide input voltage range of 100-240 VAC allows for installation across varied electrical infrastructures without additional transformers.
• Precision Control: The 2-10 VDC modulating signal ensures accurate damper positioning for optimized airflow and energy management.
• Overload Protection: Automatic electronic cutoff prevents motor damage at end-of-stroke, extending the service life of the actuator and linkage.
• Simplified Commissioning: External manual override and selectable rotation direction (0/1 switch) streamline on-site setup and testing.
• Durable Construction: NEMA 2 / UL Type 2 rated enclosure protects internal components in commercial mechanical environments.

Common Questions

What is the typical running time for the LMX120-SR?
The standard running time is 95 seconds for 90° of rotation, though the motor is capable of selectable ranges including 35, 45, 60, and 150 seconds depending on specific field requirements and control signal configuration.

Can this actuator be used in failsafe applications?
The LMX120-SR is a non-spring return actuator. It will remain in its last position during a power loss. For applications requiring a safety return, a spring-return model or a battery backup system should be utilized.

How do I wire the 120V power and the control signal?
The unit features a 3ft (1m) 18 GA appliance cable. Power is applied to the Hot/Line and Neutral leads, while the 2-10 VDC signal is wired to the control input to manage the positioning from 0% to 100%.

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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.