LF24-MFT US Belimo Actuator

Datasheet

Installation Guide

Application

For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. A feedback signal is provided for position indication.

Default/Configuration

Default parameters for 2 to 10 VDC applications of the LF..-MFT actuator are assigned during manufacturing. If required, custom versions of the actuator can be ordered. The parameters are variable and can be changed by three means: Factory pre-set or custom configuration, set by the customer using PC-Tool software or the handheld ZTH US.

Operation

The LF24-MFT US (LF24MFT) actuator provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The actuator will synchronize the 0° mechanical stop or the damper or valves mechanical stop and use this point for its zero position during normal control operations. The actuator 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 position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a Digital Rotation Sensing (DRS) function to prevent damage to the actuator in a stall condition. The position feedback signal is generated without the need for mechanical feedback potentiometers using DRS. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. The LF24-MFT US is mounted directly to control shafts up to 3/4” diameter (K6-1 clamp) and anti-rotation bracket. A crank arm and several mounting brackets are available for damper applications where the actuator cannot be direct coupled to the damper shaft. The spring return system provides minimum specified torque to the application during a power interruption. The LF24-MFT US actuator is shipped in the zero position, compression against seats or gaskets for tight shut-off is accomplished manually

Specifications

• Angle of Rotation
  • 95°
• Direction of Rotation (Fail-Safe)
  • Reversible with cw/ccw mounting
• Power Consumption (Holding)
  • 1 W
• Safety Function
  • YES
• Shaft Diameter
  • 3/8…1/2″ round
  • centers on 1/2″
• Actuator Type
  • Spring return
• Application
  • Air
• Control Type
  • MFT/Programmable
• Degree of Protection
  • IP54
  • NEMA 2
• Electrical Connection
  • Cable
• Gateways
  • UK24BAC
  • UK24MOD
  • UK24LON
• Power Consumption (Running)
  • 5 W
• Product Type
  • Actuator
• Protection category
  • IP54
• Running Time (Fail-safe)
  • <25 s
• Running Time (Motor)
  • Default 150 s
  • variable 75…300 s
• Torque
  • 35 in-lb [4 Nm]
• Voltage AC/DC
  • AC/DC 24 V