- Nominal voltage AC/DC 24 V
- Nominal voltage frequency 50/60 Hz
- Power consumption in operation 2.5 W
- Power consumption in rest position 1 W
- Transformer sizing 5 VA (class 2 power source)
- Torque motor 35 in-lb [4 Nm]
- Running Time (Motor) 150 s constant, independent of load
- IP54
- NEMA 4
- Electrical Connection 18 GA plenum cable, 3 ft [1 m], with 1/2" conduit connector
The LF series actuators provide true spring return operation for reliable fail-safe application and positive close-off on airtight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator.
The LF series provides 95° of rotation and is provided with a graduated position indicator showing 0 to 95°. The LF24-SR-E US 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 function to prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. See wiring diagrams for LF24-SR-E US for more details on 3-position control.
