Technical Data LMB(X)24-MFT
Power Supply 24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption 2 W (1.2 W)
Transformer Sizing 3.5 VA (Class 2 power source)
Electrical Connection 18 GA plenum rated cable
1/2” conduit connector
❑ 3 ft [1m] ❑ 10 ft [3m] ❑ 16 ft [5m]
Overload Protection electronic throughout 0 to 95° rotation
Operating Range Y 2 to 10 VDC, 4 to 20 mA (default)
Variable (VDC, PWM, Floating Point,
On/Off)
Input Impedance 100 kΩ (0.1 mA), 500Ω
1500 Ω (PWM, Floating Point, On/Off)
Feedback Output U 2 to 10 Vdc, 0.5mA max
VDC Variable
Angle of Rotation max. 95°, adjust. with mechanical stop
electronically variable
Torque 45 in-lb [5 Nm]
Direction of Rotation reversible with switch
Position Indication reflective visual indicator (snap-on)
Manual Override external push button
Running Time 150 seconds (default)
Variable (35 to 150 secs)
Humidity 5 to 95% RH non condensing
(EN 60730-1)
Ambient Temperature -22°F to +122°F [-30°C to +50°C]
Storage Temperature -40°F to +176°F [-40°C to +80°C]
Housing NEMA 2/IP54
Housing Material UL94-5VA
Agency Listings cULus acc. to UL60730-1A/-2-14,
CAN/CSA E60730-1, CSA C22.2
No. 24-93, CE acc. to 89/336/EEC
Noise Level <35dB(A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 1.5 lbs [0.7 kg]
Torque min. 45 in-lb for control of damper
surfaces up to 11 sq ft.
Application
For proportional modulation of dampers in HVAC systems.
Actuator sizing should be done in accordance with the
damper manufacturer’s specifications.
The actuator is mounted directly to a damper shaft from
1/4” up to 5/8” in diameter by means of its universal clamp.
Shafts up to 3/4” diameter can be accommodated by an
accessory clamp.
The default parameters for 2 to 10 VDC applications of the
…MFT actuator are assigned during manufacturing. If neces-
sary, custom versions of the actuators can be ordered. The
parameters can be changed by two means: pre-set and cus-
tom configurations from Belimo or on-site configurations using
the Belimo PC-Tool software.
Operation
The actuator is not provided with and does not require any
limit switches, but is electronically protected against overload.
The anti-rotation strap supplied with the actuator will prevent
lateral movement.
The LMB(X) series provides 95° of rotation and a visual indi-
cator indicates position of the actuator. When reaching the
damper or actuator end position, the actuator automatically
stops.
The gears can be manually disengaged with a button on the
actuator cover.
The LMB(X)24-MFT… actuators use a Brushless DC motor,
which is controlled by an Application Specific Integrated
Circuit (ASIC). The ASIC monitors and controls
the actuator’s rotation and provides a digital rotation sensing
(DRS) function to prevent damage to the actuator in a stall
condition. Power consumption is reduced in holding mode.
Add on auxiliary switches or feedback potentiometers are
easily fastened directly onto the actuator body for signaling
and switching functions.
Dimensions
(All numbers in brackets are in millimeters.)
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