AFB24-MFT95 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 for master-slave applications. Two AF’s can be piggybacked for torque loads of up to 360 in-lbs. Minimum 3/4” diameter shaft. OR Maximum of three AF’s can be piggybacked for torque loads of up to 432 in-lbs. Minimum 3/4” diameter shaft. Master-Slave wiring for either configuration.

Default/Configuration

Default parameters for 0 to 135Ω input applications of the AF..-MFT95 actuator are assigned during manufacturing. If required, custom versions of the actuator can be ordered, however the control input cannot be modified via MFT PC tool software. The other parameters are variable and can be changed by three means: Factory pre-set or custom configuration, set by the customer using PCTool software or the handheld ZTH US.

Operation

The AF..24-MFT95 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 physical damper or valve mechanical stop and use this point for its zero position during normal control operations. A unique manual override allows the setting of any actuator position within its 95° of rotation with no power applied.This mechanism can be released physically by the use of a crank supplied with the actuator. When power is applied the manual override is released and the actuator drives toward the fail-safe position. 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 AF..24-MFT95 is mounted directly to control shafts up to 1.05” diameter by means of its universal 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 AF..24- MFT95 actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

Specifications

• ..220 s
• Actuator Type
  • Spring return
• Angle of Rotation
  • 95°
• Control Type
  • Modulating
• Degree of Protection
  • IP54, NEMA 2, UL Enclosure Type 2
• Direction of Rotation (Fail-Safe)
  • Reversible with cw/ccw mounting
• Electrical Connection
  • Cable
• Manual Override
  • 5 mm hex crank (3/16″ Allen), supplied
• Power Consumption (Holding)
  • 3 W
• Power Consumption (Running)
  • 5 W
• Running Time (Fail-safe)
  • <20 s
• Running Time (Motor)
  • Default 150 s, variable 70…220 s
• Safety Function
  • YES
• Shaft Diameter
  • 1/2…1.05″ round, centers on 1/2″ and 3/4″ with insert, 1.05″ without insert
• Torque
  • 180 in-lb [20 Nm]
• Voltage AC/DC
  • AC/DC 24 V