Basic Fail-Safe modulating actuator for
controlling dampers in typical commercial
HVAC applications.
• Torque motor 35 in-lb [4 Nm]
• Nominal voltage AC/DC 24 V
• Control Modulating
• Position feedback 2...10 V
- Voltage AC/DC: AC/DC 24 V
- Power Consumption (Running): 2.5 W
- Power Consumption (Holding): 1 W
- Power Consumption For Wire Sizing : 5 VA
- Torque: 35 in-lb [4 Nm]
- Control Type: DC 2...10 V
- Direction Of Motion Motor: selectable with switch 0/1
- Direction of Rotation (Fail-Safe): Reversible with cw/ccw mounting
- Angle of Rotation: 95
- Running Time (Motor): 150 s / 90°
- Running Time (Fail-safe): <25 s
- Protection category: IP54
- Degree Of Protection NEMA: NEMA 2
- Enclosure Type: UL Enclosure Type 2
- Ambient Temperature: -22...122°F [-30...50°C]
The LF series actuators provide true spring return operation for reliable fail-safe application and positive close-off on air tight dampers. The spring return system provides consistent 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 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 fail-safe 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 consumptions reduced in holding mode.
