LF24-MFT2 Spring Return Damper Actuator, 4Nm, AC/DC 24 V, 20 s - Belimo

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The Belimo LF24-MFT2 is a type of Actuator used in HVAC and ventilation systems.

The force applied by the Torque of the LF24-MFT2 is 4 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.

LF24-MFT2 Spring-return actuator

• 4 Nm, 150 s, adjustable, 95°
• AC/DC 24 V, modulating, MFT
• Running time spring approx. 20 s
• Control DC 2...10 V, 0...32 V adjustable, MP-Bus
• Operating range DC 2...10 V, 0...32 V adjustable, MP-Bus
• Position feedback DC 2...10 V, adjustable
• Direction of rotation reversible (right/left)
• Linking active/passive sensor, switch
• Angle of rotation limit. mech. adjustable

Mode of Operation:

Conventional operation: The actuator is connected with a standard modulating signal of DC 0...10V and drives to the position defined by the positioning signal. The actuator moves the damper to the operating position at the same time as tensioning the return spring. The damper is turned back to the emergency position by spring force when the supply voltage is interrupted. Operation on the MP-Bus: The actuator receives its digital positioning signal from the higher level controller via the MP-Bus and drives to the position defined. Connection U serves as communication interface and does not supply an analogue measuring voltage.

Converter for Sensors:

Connection option for a sensor (passive or active sensor or switching contact). The MP actuator serves as an analogue/digital converter for the transmission of the sensor signal via MP-Bus to the higher level system.

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.

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.

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 an adaption, which is when the operating range and position feedback adjust themselves to the mechanical setting range. The actuator then moves into the position defined by the positioning signal.

Adaption and Synchronisation:

An adaption can be triggered manually by switching the direction of rotation switch from the left to the right twice within 5s or with the PC-Tool. Both mechanical end stops are detected during the adaption (entire setting range). Automatic synchronisation after actuating the direction of rotation switch once 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...35.0 V 
• Power consumption in operation 2.5 W 
• Power consumption in rest position 1.2 W 
• Power consumption for wire sizing 5 VA 
• Connection supply / control Cable 1 m, 4 x 0.75 mm² 
• Parallel operation Yes (note the performance data) 

Functional Data:

• Torque motor Min. 4 Nm
• Torque spring return Min. 4 Nm 
• Positioning signal Y DC 0...10 V 
• Positioning signal Y note Input impedance 100 kΩ 
• Control signal Y variable Open-close 3-point (AC only) Modulating (DC 0...32 V)
• Operating range Y DC 2...10 V 
• Operating range Y variable Start point DC 0.5...30 V End point DC 2.5...32 V
• Position feedback U DC 2...10 V 
• Position feedback U note Max. 0.5 mA 
• Position feedback U variable Start point DC 0.5...8 V End point DC 2.5...10 V
• Position accuracy ±5% 
• Direction of motion motor Selectable with switch L / R 
• Direction of motion variable Electronically reversible 
• Direction of motion emergency control function Selectable by mounting L / R
• Manual override No 
• Angle of rotation Max. 95° 
• Angle of rotation note Adjustable 37...100% with integrated mechanical limitation
• Running time motor 150 s / 90° 
• Motor running time variable 75...300 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 (automatic on first power-up) 
• Adaption setting range variable No action Adaption when switched on Adaption after using the rotation switch
• Override control MAX (maximum position) = 100% MIN (minimum position) = 0% ZS (intermediate position, AC only) = 50%
• Override control variable MAX = (MIN + 32%)...100% MIN = 0%...(MAX – 32%) ZS = MIN...MAX
• Sound power level motor 30 dB(A) 
• Spindle driver Universal spindle clamp 8...16 mm 
• Position indication Mechanical 
• Service life Min. 60,000 emergency positions 

Safety:

• Protection class IEC/EN III Safety extra-low voltage
• Degree of protection IEC/EN IP54 
• EMC CE according to 2004/108/EC 
• Low voltage directive CE according to 2006/95/EC 
• Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14 
• Mode of operation Type 1 
• 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 approx: 1.6 kg