Motor SR Mod W/Aux| Application | For fail-safe, modulating control 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 1/2? in
diameter by means of its universal clamp, 1/2? shaft centered at delivery. 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 500� 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. |
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| Operation | The TF 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 TF series provides 95� of rotation and is provided with a
graduated position indicator showing 0 to 95�. The TF 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 TF -S versions are 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�. |
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Product Family
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