FSAFB24-SR-S Fire & Smoke Actuator 180 in-lb Spring Return 24 VAC/DC Modulating 2SPDT 1m Cable
Buy Belimo's FSAFB24-SR-S at NECC
Application
For proportional control of fire and smoke combination and smoke dampers in
UL555S applications. In new installations, UL 555S requires that actuators be
mounted by the damper manufacturer.
Operation
The FSAFB24-SR & FSAFB24-SR-S actuators provide 95° of rotation and are
provided with a graduated position indicator showing 0° to 95°. A unique
manual override allows the setting of any actuator position within its 95° of
rotation with no power applied. This mechanism can be released physically by
the use of a crank supplied with the actuator. When power is applied the manual
override is released and the actuator drives toward the fail-safe position to
synchronize before going to the position commanded by the signal.
The actuator uses a brushless DC motor which is controlled by an Application
Specific Integrated Circuit (ASIC).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 by a feedback potentiometer. The actuator may be stalled anywhere
in its normal rotation without the need of mechanical end switches. The actuator
cannot burn out from being stalled before full rotation is achieved.
The FSAFB24-SR, FSAFB24-SR-S, is mounted directly to control shafts up to
1.05” 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 the specified torque to the application during a power
interruption. The FSAFB24-SR, FSAFB24-SR-S, actuator is shipped at +5° (5°
from full fail-safe) to provide automatic compression against damper gaskets
for tight shut-off.
