TFB24-SR-S Belimo Damper Actuator

Datasheet

Installation Guide

The Belimo TFB24-SR-S Damper Actuator,22 in-lb,Spring Return,24V,Modulating

Application

For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. The actuator is mounted directly to a damper shaft from 1/4” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication.

Operation

The TF series actuators provide true spring return operation for reliable fail-safe application and positive close-off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The TF series provides 95° of rotation and is provided with a graduated position indicator showing 0 to 95°. The TF uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (ASIC) and a microprocessor. The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate and to know the actuator’s exact fail-safe position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a digital rotation sensing function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. The TF -S versions are provided with one built-in auxiliary switch. This SPDT switch is provided for safety interfacing or signaling, for example, for fan start-up. The switching function is adjustable between 0° and 95°.

Specifications:

• Actuator Type
  • Spring return
• Angle of Rotation
  • 95°
• Auxiliary Switches
  • 1 x SPDT
• Control Type
  • DC 2…10 V
• Degree of Protection
  • IP42, NEMA 2, UL Enclosure Type 2
• Direction of Rotation (Fail-Safe)
  • Reversible with cw/ccw mounting
• Electrical Connection
  • Cable
• Power Consumption (Holding)
  • 1 W
• Power Consumption (Running)
  • 2 W
• Running Time (Fail-safe)
  • <25 s
• Running Time (Motor)
  • 95 s constant, independent of load
• Safety Function
  • YES
• Shaft Diameter
  • 1/4…1/2″ round, centers on 1/2″
• Torque
  • 22 in-lb [2.5 Nm]
• Voltage AC/DC
  • AC/DC 24 V