Spring Return Proportional Multi Functional Actuator - (24 VAC/DC)

For proportional modulation of dampers and control valves in HVAC systems. The NFB24-MFT provides mechanical spring return operation for reliable fail-safe application.

The NFB24-MFT actuator provides 95 Degrees of rotation and is provided with a graduated position indicator showing 0 Degrees to 95 Degrees. The actuator will synchronize the 0 Degrees 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 with out 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.