AFB24-PC Belimo Actuator

The Belimo AFB24-PC Spring return, 180in-lb, Phase Cut, 24V (AFX24-PC)

Datasheet

Installation Guide

Application

For modulation 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 up to 1.05” in diameter by means of its universal clamp. 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 0-10 V phasecut control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication or master-slave applications.

Operation

The AFB24-PC series 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 AFB24- PC 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 zero 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 AFB24-PC 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 AFB24-PC actuator is shipped at 5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

Specifications

• 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)
  • 150 s, constant, independent of load
• 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