210
J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.
LMCB24-SR (-T)
Proportional Control, Non-Spring Return, Direct Coupled, 24V, for 2 to 10 VDC and 4 to 20 mA
Torque min. 45 in-lb for control of damper
surfaces up to 11 sq ft.
LMCB24-SR
LMCB24-SR-T
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 actuator operates in response to a 2 to 10 VDC, or with
the addition of a 500
Ω
resistor, a 4 to 20 mA control input
from an electronic controller or positioner. A 2 to 10 VDC
feedback signal is provided for position indication or master-
slave applications.
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 series provides 95° of rotation and a visual indicator
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 LMCB24-SR… actuators use a sensorless 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.)
1.85
”
[47]
2.34
”
[59.4]
2.6
”
[66]
4.57” [116]
3.47” [88]
3.7” [94]
0.86” [22]
2” [50.8]
1/4” to 3/4” [6 to 20]
5/16” to 3/4” [8 to 26]
D120
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Technical Data
LMCB24-SR
Power Supply
24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power Consumption
1.5 W (0.4 W)
Transformer Sizing
3 VA (Class 2 power source)
Electrical Connection
3 ft, 18 GA plenum rated cable
1/2” conduit connector
Overload Protection
electronic throughout 0 to 95° rotation
Operating Range Y
2 to 10 VDC, 4 to 20 mA
Input Impedance
100 k
Ω
(0.1 mA), 500
Ω
Feedback Output U
2 to 10 VDC (max 0.5 mA)
Angle of Rotation
max. 95°, adjust. with mechanical stop
Torque
45 in-lb [5 Nm]
Direction of Rotation
reversible with switch. Actuator will move:
=
CCW with decreasing control signal (10
➞
2V)
=
CW with decreasing control signal (10
➞
2V)
Position Indication
reflective visual Indicator (snap-on)
Manual Override
external push button
Running Time
35 seconds, constant independent of load
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
<45dB(A)
Servicing
maintenance free
Quality Standard
ISO 9001
Weight
1.1 lbs [0.5 Kg]
LMCB24-SR-T
Electrical connection
Screw terminal (for 26 to 14 GA wire)
Housing NEMA
1/IP20
†Rated Impulse Voltage 800V, Type of action 1,
Control Pollution Degree 3.
®
