SF24A-MOD Spring-return Damper Actuator, 20 Nm, AC/DC 24 V, 150 s - Belimo

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The Belimo SF24A-MOD is a type of Actuator used in HVAC and ventilation systems.

The force applied by the Torque of the SF24A-MOD is 20 Nm.

The power supply requested for this Rotary Actuator is 24Vac/Vdc.

If you have questions concerning size or installation, refer to the Belimo custom datasheet above or email iacs for individualised support.

SF24A-MOD Spring-return Actuator, 20 Nm, AC/DC 24 V, 150s

• Spring-return actuator
• 20 Nm, 150 s adjustable, 95°
• AC/DC 24 V
• IP 54, Manual override with integrated position stop
• Control Modbus RTU
• Connection PVC cable 1m
• Spindle driver universal spindle clamp

Mode of operation: The actuator is fitted with an integrated interface for Modbus RTU, it receives the digital positioning signal from the Modbus-Master and returns the current status.

Converter for sensors: Connection option for a sensor (passive or active sensor or switching contact). In this way, the analogue sensor signal can be easily digitised and transferred to Modbus.

Parameterisable actuators The factory settings cover the most common applications. Single parameters can be modified with the Belimo Service Tools MFT-P or ZTH EU. The Modbus communication parameters (address, baud rate etc.) are set with the ZTH EU. Pressing push-button “Service” on the actuator while connecting the supply voltage resets the communication parameters to the factory setting. Quick addressing: The Modbus address can alternatively be set using push-buttons on the actuator from 1 to 16. The value selected is added to the «Basic address» parameter and results in the effective Modbus address. For example, with a basic address of 140, Modbus addresses between 141 and 156 can be parameterised using quick addressing.

Simple direct mounting Simple direct mounting on the damper spindle with an universal spindle clamp, supplied with an anti-rotation device to prevent the actuator from rotating.

Manual override By using the hand crank the damper can be actuated manually and engaged with the locking switch at any position. Unlocking is carried out manually or automatically by applying the operating voltage.

High functional reliability: The actuator is overload protected, requires no limit switches and automatically stops when the end stop is reached.

Adjustable angle of rotation: Adjustable angle of rotation with mechanical end stops.

Home position: The first time the supply voltage is switched on, i.e. at the time of commissioning, the actuator carries out a synchronisation. The synchronisation is in the home position (0%). The actuator then moves into the position defined by the positioning signal.

Adaption and synchronisation: An adaption can be triggered manually by pressing the “Adaption” button or with the PC-Tool. Both mechanical end stops are detected during the adaption (entire setting range). Automatic synchronisation after actuating the hand crank is programmed. The synchronisation is in the home position (0%). The actuator then moves into the position defined by the positioning signal. A range of settings can be adapted using the PC-Tool (see MFT-P documentation)

Electrical data:

• Nominal voltage AC/DC 24 V
• Nominal voltage frequency 50/60 Hz
• Nominal voltage range AC 19.2...28.8 V / DC 21.6...28.8 V
• Power consumption in operation 8.5 W
• Power consumption in rest position 3.5 W
• Power consumption for wire sizing 11 VA
• Connection supply / control Cable 1 m, 6 x 0.75 mm²

Data bus communication:

• Protocol Modbus RTU (RS-485), not galvanically isolated
• Number of nodes Max. 32 (without repeater)
• Transmission formats 1-8-N-2, 1-8-N-1, 1-8-E-1, 1-8-O-1
• Baud rate 9600, 19,200, 38,400, 76,800, 115,200 Bd Default: 38,400 Bd
• Terminating resistor 120 Ohm, can be switched
• Parameterisation with service tool ZTH EU Pushbutton-operated fast addressing 1 ... 16 possible

Functional data:

• Torque motor Min. 20 Nm
• Torque spring return Min. 20 Nm
• Position accuracy ±5%
• Direction of motion motor Selectable with switch L / R
• Direction of motion emergency control function Selectable by mounting L / R
• Manual override By means of hand crank and locking switch
• Angle of rotation Max. 95°
• Angle of rotation note adjustable starting at 33% in 2.5% steps (with mechanical end stop)
• Running time motor 150 s / 90°
• Motor running time variable 70...220 s
• Running time emergency control position < 20 s / 90°
• Running time emergency setting position note < 20 s @ -20...50°C / < 60 s @ -30°C
• Adaption setting range manual
• Adaption setting range variable No action Adaption when switched on Adaption after pushing the gear disengagement button
• Override control, controllable via Modbus MAX (maximum position) = 100%, MIN (minimum position) = 0% and ZS (intermediate position) = 50%
• Override control variable MAX = (MIN + 32%)...100%, MIN = 0%...(MAX – 32%) and ZS = MIN...MAX
• Sound power level motor 40 dB(A)
• Spindle driver Universal spindle clamp 10...25.4 mm
• Position indication Mechanical
• Service life Min. 60,000 emergency positions

Safety:

• Degree of protection NEMA/UL NEMA 2, UL Enclosure Type 2
• EMC CE according to 2014/30/EU
• Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14
• Certification UL cULus according to UL 60730-1A, UL 60730-2-14 and CAN/CSA E60730-1:02
• Mode of operation Type 1.AA
• Rated impulse voltage supply / control 0.8 kV
• Control pollution degree 3
• Ambient temperature -30...50°C
• Non-operating temperature -40...80°C
• Ambient humidity 95% r.h., non-condensing
• Maintenance Maintenance-free

Weight: 2.4 kg