Belimo Damper Actuator, Spring Return, Proportional, 24V

Belimo Damper Actuator Spring Return Proportional 24v
Spring, 35in-lb, 2-10V, 24V

Torque min. 35 in-lb, for control of air dampers
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 3/8” up to 1/2” in diameter
by means of its universal clamp, 1/2” shaft centered at delivery. For shafts up to 3/4”
use K6-1 accessory. A crank arm and several mounting brackets are available for
applications where the actuator cannot be direct coupled to the damper shaft.
The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500W
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 LF series actuators provide true spring return operation for reliable fail-safe
application and positive close-off on air tight dampers. The spring return system
provides consistent torque to the damper with, and without, power applied to the
actuator.
The LF series provides 95° of rotation and is provided with a graduated position
indicator showing 0 to 95°.
The LF24-SR (-S) US 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 fail-safe position. The ASIC monitors and controls the brushless DC
motor’s rotation and provides a digital rotation sensing function to prevent damage to
the actuator in a stall condition. The actuator may be stalled anywhere in its normal
rotation without the need of mechanical end switches. Power consumption is reduced
in holding mode.
The LF24-SR-S US version is provided with one built-in auxiliary switch. This SPDT
switch is provided for safety interfacing or signaling, for example, for fan start-up. The
switching function is adjustable between 0° and 95°. The auxiliary switch in the
LF24-SR-S US is double insulated so an electrical ground in not necessary