LF24-MFT-S US

$387.90

Each

Damper Actuator, 35 in-lb [4 Nm], Spring return, AC/DC 24 V, 2…10 V, 1 x SPDT

Fail-safe position

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Weight 3.3 lbs
Torque

35 in-lb
Brand

Belimo
Voltage

AC/DC 24 V
Auxiliary Switch

1 SPDT
Actuator Type

Spring return
Control type

MFT/Programmable
Torque motor
35 in-lb [4 Nm]
Power consumption in operation
2.5 W
Power consumption in rest position
1 W
Transformer sizing
5 VA (class 2 power source)
Ambient humidity
5...95% r.H. non-condensing
Housing material
zinc coated steel
Electrical Connection
(2) 18 GA appliance cables with 1/2" conduit connectors, 3 ft [1 m],
Auxiliary switch
1 x SPDT, 3A resistive (0.5A inductive) @ 250 VAC, adjustable 0...95°
Angle of rotation
Max. 95°, adjustable with mechanical stop
Position indication
visual indicator, 0° to 95° (0° is full spring return position)
Ambient temperature
-22...122°F [-30...50°C]
Non-operating temperature
-40...176°F [-40...80°C]
Control
MFT/programmable
Control operating range Y note
4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor)
Options positioning signal
variable (VDC, PWM, on/off, floating point)
Operating range Y variable
Start point DC 0.5...30 V|End point DC 2.5...32 V
Position Feedback
DC 2...10 V, Max. 0.5 mA, VDC variable
direction of rotation motor
reversible with built-in switch
Overload Protection
electronic throughout 0° to 95° rotation
Input Impedance
100 kΩ for DC 2...10 V (0.1 mA), 500 Ω for 4...20 mA, 1500 Ω for PWM, On/Off and Floating point
Degree of Protection
IP54, NEMA 2
Nominal voltage
AC/DC 24 V
Nominal voltage frequency
50/60 Hz
Power Supply
24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10%
Power supply tolerance AC
±20%
Power supply tolerance DC
±10%
Agency Listing
cULus acc. To UL 873 and CAN/CSA C22.2 No. 24-93
Angle Of Rotation Adaption
off (default)
override control
min. position = 0% , mid. Position = 50% , max. position = 100% (Default)
Operating Range
DC 2...10 V (default), 4...20 mA w/ ZG-R01 (500 Ω, 1/4 W resistor), variable (VDC, PWM, on/off, floating point)
Emergency control function
Spring Return
Product family
Damper Actuator
direction of rotation spring-return
reversible with cw/ccw mounting
Noise level, motor
<30 dB (A) 
Shaft Diameter
3/8" to 1/2" round, centers on 1/2"
Electrical accessories
ADS-100|IRM-100|MFT-P|P475|P475-1|PS-100|PTA-250|SGA24|SGF24|UK24BAC|UK24LON|UK24MOD|ZG-CBLS|ZG-R01|ZG-R02|ZG-SGF|ZG-X40|ZK2-GEN|ZTH US
Family Series
LF Series
Noise Level (Fail-Safe)
<62 dB (A) 
Running time (Fail-Safe)
<25 seconds
Running Time (Motor)
default 150 sec, variable 75...300 sec
Running Time (Fail-Safe)
<25 sec @ -4...122°F [-20...50°C], <60 sec @ -22°F [-30°C]
Fail-Safe function
Spring return
Control type
MFT/Programmable
Connection
cable
Degree of protection IEC/EN
IP54
Degree of protection NEMA/UL
NEMA 2
Enclosure
UL Enclosure Type 2
Auxiliary Switch
1 SPDT
CAD ThomasNetLink
LF24-MFT-S US
Product Features
Torque min. 35 in-lb, Control 2 to 10 VDC (DEFAULT), Feedback 2 to 10 VDC (DEFAULT)
Electrical Protection
actuators are double insulated
Mechanical accessories
AV6-20|IND-LF|K6 US|K6-1|KG10A|KG6|KG8|KH12|KH6|KH8|KH-LF|KH-LFV|LF-P|SH10|SH8|TOOL-06|ZDB-LF|ZF8-LF|ZG-109|ZG-110|ZG-112|ZG-DC1|ZG-DC2|ZG-LF112|ZG-LF2|ZG-LMSA-1|ZG-LMSA-1/2-5|ZS-100|ZS-101|ZS-150|ZS-260|ZS-300|ZS-300-5|ZS-300-C1|ZS-300-C2|ZS-300-C3
Operation
The LF24-MFT US actuator provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The actuator will synchronize the 0° mechanical stop or the damper or valves mechanical stop and use this point for its zero position during normal control operations. The actuator 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 position. The ASIC monitors and controls the brushless DC motor’s rotation and provides a Digital Rotation Sensing (DRS) function to prevent damage to the actuator in a stall condition. The position feedback signal is generated without the need for mechanical feedback potentiometers using DRS. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. The LF24-MFT US is mounted directly to control shafts up to 3/4” diameter (K6-1 clamp) and anti-rotation bracket. A crank arm and several mounting brackets are available for damper applications where the actuator cannot be direct coupled to the damper shaft. The spring return system provides minimum specified torque to the application during a power interruption. The LF24-MFT US actuator is shipped in the zero position, compression against seats or gaskets for tight shut-off is accomplished manually.
Application
For fail-safe, modulating control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. A feedback signal is provided for position indication.
Typical Specification
Spring return control damper actuators shall be direct coupled type which require no crank arm and linkage and be capable of direct mounting to a shaft up to a 3/4" diameter and center on a 1/2" shaft (default). Actuator shall deliver a minimum output torque of 35 in-lbs. The actuator must provide modulating damper control in response to a 2 to 10 VDC or, with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. The actuators must be designed so that they may be used for either clockwise or counter clockwise fail-safe operation. Actuators shall use a brushless DC motor controlled by a microprocessor and be protected from overload at all angles of rotation. Run time shall be constant, and independent of torque. A 2 to 10 VDC feedback signal shall be provided for position feedback. Actuators with auxiliary switches must be constructed to meet the requirements for Double Insulation so an electrical ground is not required to meet agency listings. Actuators shall be cULus listed and have a 5 year warranty, and be manufactured under ISO 9001 International Quality Control Standards. Actuators shall be as manufactured by Belimo.
CP65 Warning
⚠ WARNING: For Belimo Products sold in California, these Products do or may contain chemicals which are known to the State of California to cause cancer and or birth defects or other reproductive harms. For more information see www.p65warnings.ca.gov.
Default/Configuration
Default parameters for 2 to 10 VDC applications of the LF..-MFT actuator are assigned during manufacturing. If required, custom versions of the actuator can be ordered. The parameters are variable and can be changed by three means: Factory pre-set or custom configuration, set by the customer using PC-Tool software or the handheld ZTH US.

Datasheet Download: Datasheet

Installation instructions Download: Installation instructions

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