Belimo ZDB-TF Rotation Limiter

The Belimo ZDB-TF Rotation Limiter is a critical mechanical accessory for technicians requiring precise field adjustment of the stroke on Belimo TF Series actuators. Engineered for mechanical angle of rotation limiting, this galvanised steel component allows you to restrict the actuator's travel when the full 95° stroke is not required for specific damper or valve applications. By utilizing the built-in end stop, contractors can set defined limits starting at 37% of the total rotation in 2.5% increments. This spring return actuator accessory is essential for preventing over-rotation that could stress linkage components or cause unneeded wear on air-tight dampers. This HVAC rotation limiter integrates seamlessly with the universal shaft clamp or the IND-TF position indicator, ensuring the actuator stalls out safely at the programmed mechanical stop without compromising the motor's overload protection. When you need to provide positive close-off or controlled movement in constrained commercial HVAC environments, the ZDB-TF is the standard solution for adjusting TF series stroke limits.

Key Benefits for Contractors

• Precise Stroke Control: Enables manual adjustment of the angle of rotation to match specific duct or valve requirements under 95°.
• Component Protection: Acting as a mechanical end stop, it prevents mechanical strain on damper blades and linkages.
• High Compatibility: Specifically designed for Belimo TF24 and TF120 models, including -S and -SR variants.
• Rugged Construction: Fabricated from galvanised steel to withstand consistent operational torque in industrial conditions.
• Easy Field Installation: Mounts directly to the actuator spline using a standard #2 Phillips screwdriver for quick set-point locking.

Common Questions How do I set the rotation limit on a TF actuator? To limit rotation, loosen the fastening screw on the ZDB-TF, align the bottom edge of the block with the desired degree mark (e.g., 0.5 for 45 degrees), and tighten the screw to lock the block as a physical stop. Can the ZDB-TF be used for both clockwise and counter-clockwise mounting? Yes, the limiter is designed to function regardless of the actuator's mounting orientation (CW or CCW), as long as the mechanical stop aligns with the stroke path. Does adding a rotation limiter cause the actuator to burn out? No. Belimo TF series actuators are overload protected and designed to stall indefinitely at any position, including a mechanical stop, without risk of motor damage.

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.