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Torque min. Actuator sizing should be done in accordance with the damper manufacturers specifications. 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 2 to 10 VDC, or with the addition of a W resistor, a 4 to 20 mA 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 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 The microprocessor provides the intelligence to the ASIC to provide a constant rotation rate and to know the actuators exact fail-safe position. The ASIC monitors and controls the brushless DC motors 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. This SPDT switch is provided for safety interfacing or signaling, for example, for fan start-up.
The switching function is adjustable between 0 and
Part Number LF24-SR US, LF Series - Spring Return Damper Actuators
B322+LF24-SR US – Belimo – Characterized Control Valve