Belimo SF24A-SR

Belimo analog actuators are designed for precise control of dampers with an analog control signal of 0-10V. These actuators offer a customizable operating range and a module that converts a 0-10V voltage signal to a 4-20 mA current signal. With a torque of 20 Nm, these actuators are suitable for dampers up to 4 m² and come equipped with a spring return function for enhanced safety.

Electrical Data

The actuators operate at a nominal voltage of AC/DC 24 V with a frequency of 50/60 Hz. They have a working range of AC 19.2...28.8 V / DC 21.6...28.8 V, a power consumption of 5 W during operation, and 3 W in standby mode. The actuators feature a 1 m power/control cable with 4x 0.75 mm² wires and support parallel operation.

Functional Data

The actuators provide a torque of 20 Nm for both motor and safety functions, with an operating range of 2...10 V and an input impedance of 100 kΩ. They offer a feedback signal of 2...10 V with a maximum measurement voltage of 0.5 mA and a positioning tolerance of ±5%. The direction of movement can be selected via a switch, and manual adjustment is possible using a crank and locking switch. The actuators have a maximum rotation angle of 95°, adjustable from 33% in 2.5% steps, and a motor running time of 150 s/90°, with a safety function running time of <20 s at -20...50°C or <60 s at -30°C. The acoustic power level is 40 dB(A).

Mechanical Interface

The actuators feature a universal clamp for 10...25.4 mm shafts and a mechanical position indicator. They...