Torque min. 35 in-lb, Control 6...9 VDC (DEFAULT), Feedback DC 2...10 V (DEFAULT)
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 parameters for 6 to 9 VDC applications of the LF24-MFT-20 US actuator are assigned during manufacturing. The parameters are variable and can be changed by two means: Set by the customer using PC-Tool software or the handheld ZTH US.
The LF24-MFT-20 US 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-20 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-20 US actuator is shipped in the zero position, compression against seats or gaskets for tight shut-off is accomplished manually.
|Angle of Rotation||95°|
|Direction of Rotation (Fail-Safe)||Reversible with cw/ccw mounting|
|Power Consumption (Holding)||1.5 W|
|Actuator Type||Spring return|
|Degree of Protection||
|Power Consumption (Running)||3 W|
|Running Time (Fail-safe)||<25 s|
|Running Time (Motor)||
|Torque||35 in-lb [4 Nm]|
|Voltage AC/DC||AC/DC 24 V|