Belimo Aircontrols (USA), Inc. NFB24-SR-S Damper Actuator at Controls Central

Belimo Aircontrols (USA), Inc. NFB24-SR-S Damper Actuator

Brand: Belimo Aircontrols (USA), Inc.

SKU: NFB24SRS

	Unit Price
List Price	$966.00
Your Price	$434.70	You Save	$531.30 (55.0 %)

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Availability: 42

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Spring, 90in-lb, 2-10V, 24V, SW

Application	For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer?s specifications. The actuator is mounted directly to a damper shaft up to 1.05? in diameter by means of its universal clamp. 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 500ï¿½ 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. Not to be used for a master-slave application.

Application

For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer?s specifications. The actuator is mounted directly to a damper shaft up to 1.05? in diameter by means of its universal clamp. 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 500ï¿½ 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. Not to be used for a master-slave application.

Technical Data	Power Supply

Accessories	AF-P

Operation	The NF..24-SR-S 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 constant torque to the damper with, and without, power applied to the actuator. The NF..24-SR-S series provides 95ï¿½ of rotation and is provided with a graduated position indicator showing 0ï¿½ to 95ï¿½. The NF..24-SR-S 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. The NF..24-SR-S versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at +10ï¿½, the other switch function is adjustable between +10ï¿½ to +90ï¿½. The NF..24- SR-S actuator is shipped at +5ï¿½ (5ï¿½ from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

Operation

The NF..24-SR-S 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 constant torque to the damper with, and without, power applied to the actuator. The NF..24-SR-S series provides 95ï¿½ of rotation and is provided with a graduated position indicator showing 0ï¿½ to 95ï¿½. The NF..24-SR-S 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. The NF..24-SR-S versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at +10ï¿½, the other switch function is adjustable between +10ï¿½ to +90ï¿½. The NF..24- SR-S actuator is shipped at +5ï¿½ (5ï¿½ from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.