LMB24-SR Belimo Actuator

Tech Sheet

Installation Guide

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 LMB24-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.

Specifications

• Actuator Type
  • Non fail-safe
• Angle of Rotation
  • 95
• Control Type
  • DC 2…10 V
• Degree of Protection
  • IP54, NEMA 2, UL Enclosure Type 2
• Electrical Connection
  • cable
• Manual Override
  • External push button
• Power Consumption (Holding)
  • 4 W
• Power Consumption (Running)
  • 5 W
• Running Time (Motor)
  • 95 s, constant, independent of load
• Safety Function
  • NO
• Shaft Diameter
  • 1/4…5/8″ round, centers on 5/8″, 3/4″ clamp available
• Torque
  • 45 in-lb [5 Nm]
• Voltage AC/DC
  • AC/DC 24 V

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