Application • Torque min. 35 in-lb

Application •  Torque min. 35 in-lb
LF24-MFT(-S) US
Proportional, Spring Return, Multi-Function Technology®
• Torque min. 35 in-lb
• Control 2 to 10 VDC (DEFAULT)
• Feedback 2 to 10 VDC (DEFAULT)
Application
For proportional modulation of dampers and control valves in HVAC systems. The
LF24-MFT US provides mechanical spring return operation for reliable fail-safe
application.
Default/Configuration
Default parameters for 2 to 10 VDC applications of the LF24-MFT US actuator are
assigned during manufacturing. If required, custom versions of the actuator can be
ordered. The parameters noted in the Technical Data table are variable.
These parameters can be changed by three means:
• Pre-set configurations from Belimo
• Custom configurations from Belimo
• Configurations set by the customer using the MFT PC tool software application.
Operation
24 VAC, ± 20%, 50/60 Hz
24 VDC, ±10%
2.5 W
1.0 W
5 VA (Class 2 power source)
3 ft, 18 GA, appliance cables
1/2” conduit connector
electronic throughout 0 to 95° rotation
2 to 10 VDC
4 to 20 mA (w/500 Ω, 1/4 Ω resistor) ZG-R01
100 kΩ for 2 to 10 VDC (0.1 mA)
500 Ω for 4 to 20 mA
1500 Ω for PWM, floating point and
on/off control
2 to 10 VDC, 0.5 mA max
min 35 in-lb (4 Nm)
reversible with cw/ccw mounting
reversible with built-in switch
max 95°, adjust with mechanical stop
150 sec constant
<25 sec @-4°F to 122°F [-20°C to 50°C]
<60 sec @-22°F [-30°C]
off (default)
Min. (Min Position) = 0%
- ZS (Mid. Position) = 50%
- Max. (Max. Position) = 100%
visual indicator, 0° to 95°
5 to 95% RH, non-condensing
-22 to 122° F (-30 to 50° C)
-40 to 176° F (-40 to 80° C)
NEMA 2, IP54
zinc coated metal
less than 45 dB (A)
cULus acc. to UL 873 and
CAN/CSA C22.2 No. 24-93
ISO 9001
maintenance free
6.0 lbs. (2.7 kg)
Power consumption
running
holding
Transformer sizing
Electrical connection
(-S models have 2 cables)
Overload protection
Operating range Y*
Input impedance
Feedback output U*
Torque
Direction of rotation*
spring
motor
Mech. angle of rotation*
motor*
Running time
spring
Angle of rotation adaptation*
Override control*
Position indication
Humidity
Ambient temperature
Storage temperature
Housing
Housing material
Noise level
Agency listings
Quality standard
Servicing
Weight
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 with out 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 by means
of its universal 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.
NOTE: Please see documentation on Multi-Function Technology.
Dimensions (Inches [mm])
7.67" [195]
6.10" [155]
Standard:
3/8" to 1/2"
3/8" to 7/16"
0.256" [6.5]
0.39" [10]
0.98"
[25]
CCW
3.15" [80]
Optional
1/2" to 3/4"
w/K6-1
accessory
3.86"
[98]
0.79"
[20]
1.93"
[49]
0.5"
[12.7]
3.66" [93]
0.71" [18]
4.92" [125]
0.74" [18.7]
3.23" [82]
2.24"
[57]
0.25" [6.3]
* Variable when configured with MFT options
LF24-MFT-S US
Auxiliary switches
1 x SPDT 3A (0.5A) @ 250 VAC, UL approved
adjustable 0° to 95° (double insulated)
800-543-9038 USA
113
866-805-7089 CANADA
203-791-8396 LATIN AMERICA
M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.
LF24-MFT(-S) US
Power supply
D059
Technical Data
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.
LF24-MFT(-S) US
Proportional, Spring Return, Multi-Function Technology®
3
4
5
CAUTION Equipment Damage!
Actuators may be connected in parallel if not mechanically mounted to the
same shaft. Power consumption and input impedance must be observed.
Actuators may also be powered by 24 VDC.
Auxiliary Switch LF24-MFT-S US
The Common connection from the actuator must be connected to the Hot
connection of the controller.
For end position indication, interlock control, fan startup, etc.,
LF24-MFT-S US incorporates one built-in auxiliary switch:
1 x SPDT, 3A (0.5A) @250 VAC, UL Approved, adjustable 0° to 95°.
W024_08
2
Provide overload protection and disconnect as required.
Standard Wiring
1
W026
Wiring Diagrams
Meets cULus requirements without the need of an electrical ground connection.
The ZG-R01 500 Ω resistor may be used.
WARNING
G Live Electrical Components!
Override to Zero Position
Override to 10V Position
Standard Wiring
Override control to min, mid, max, positions
Override to Zero Position
Override to 20 mA Position
M40024 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.
W025_08
During installation, testing, servicing and troubleshooting of this product, it may be
necessary to work with live electrical components. Have a qualified licensed electrician or other
individual who has been properly trained in handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.
4 to 20 mA control signal
800-543-9038 USA
2 to 10 VDC control signal
866-805-7089 CANADA
203-791-8396 LATIN AMERICA
114
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