Spring, 90in-lb, MFT, 24V| Actuator Type | Spring return |
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| Control Type | MFT/Programmable |
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| Electrical Connection | cable |
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| Direction of Rotation (Fail-Safe) | reversible with CW/CCW mounting |
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| Direction of Rotation (Motor) | reversible with built-in switch |
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| Power Consumption (Holding) | 3�W |
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| Power Consumption (Running) | 6.5 W |
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| Degree of Protection | NEMA�2, UL�Enclosure�Type�2 |
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| Shaft Diameter | 1/2" to 1.05" round, centers on 1/2" and 3/4" with insert, 1.05" without insert |
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| Manual Override | 5 mm hex crank (3/16" Allen), supplied |
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| Servicing | maintenance free |
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| Power Supply | 24 VAC�20%, 50/60Hz, 24 VDC+20%/-10% |
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| Power Consumption Running | 6.5 W |
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| Power Consumption Holding | 3 W |
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| Transformer Sizing | 9 VA (class 2 power source) |
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| Electrical Connection | 3 ft [1m], 10 ft [3m] or 16 ft [5m] 18 GA appliance or plenum cables, with or without 1/2? conduit connector |
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| Overload Protection | electronic throughout 0� to 95� rotation |
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| Input Impedance | 100 k ? for 2 to 10 VDC (0.1 mA), 500 ? for
4 to 20 mA, 1500 ? for PWM, floating point
and On/Off |
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| Angle of Rotation | 95� (adjustable with mechanical end stop, 35� to 95�) |
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| Direction of Rotation (Motor) | reversible with built-in switch |
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| Manual Override | 5 mm hex crank (3/16? Allen), supplied |
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| Running Time (Motor) | 150 sec (default), variable (40 to150 sec) |
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| Ambient Temperature Range | -22�F to +122�F [-30�C to +50�C] |
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| Storage Temperature Range | -40�F to +176�F [-40�C to +80�C] |
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| Housing | NEMA 2, IP54, UL enclosure type 2 |
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| Agency Listings | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC |
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| Noise Level (Motor) | �40 dB (A) @ 150 sec, run time dependent |
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| Operating Range Y | 2 to 10 VDC, 4 to 20 mA w/ ZG-R01 (500 ?,
1/4 W resistor), variable (VDC, PWM, floating
point, on/off) |
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| Direction of Rotation (Fail-Safe | reversible with CW/CCW mounting |
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| Position Indication | visual indicator, 0� to 95� (0� is full spring return position) |
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| Running Time (Fail-Safe) | < 60 sec @ -22�F [-30�C] |
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| Noise Level (Fail-Safe) | <62 dB (A) |
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| Feedback Output U | 2 to 10 VDC, 0.5 mA max, VDC variable |
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| Housing Material | zinc coated metal and plastic casing |
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| Electrical protection | actuators are double insulated |
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| Angle of Rotation Adaptation | Off (default) |
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| Override Control | min. position = 0% , mid. Position = 50% , max. position = 100% (Default) |
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| Humidity | max. 95% RH non-condensing |
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| Shaft Diameter | 1/2? to 1.05? round, centers on 1/2? and 3/4? with insert, 1.05? without insert |
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| Torque | 90 in-lbs [10 Nm] minimum |
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| Operation | The NF..24-MFT actuator provides 95� of rotation and is provided with a
graduated position indicator showing 0� to 95�. The actuator will synchronize
the 0� mechanical stop or the physical damper or valve mechanical stop and
use this point for its zero position during normal control operations. 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. The actuator 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 actuators?s exact position. 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 without the need for mechanical
feedback potentiometers using DRS. The actuator may be stalled anywhere in
its normal rotation without the need of mechanical end switches. The NF..24-
MFT 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 minimum
specified torque to the application during a power interruption. The NF..24-
MFT actuator is shipped at +5� (5� from full fail-safe) to provide automatic
compression against damper gaskets for tight shut-off. |
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| Typical Specification | Spring return control damper actuators shall be direct coupled type which
require no crank arm and linkage and be capable of direct mounting to a
jackshaft up to a 1.05? diameter. The actuator must provide modulating
damper control 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.
The actuators must be designed so that they may be used for either clockwise
or counter clockwise fail-safe operation. Actuators shall use a brushless DC
motor controlled by a microprocessor and be protected from overload at all
angles of rotation. Run time shall be constant, and independent of torque. A 2
to 10 VDC feedback signal shall be provided for position feedback. Actuators
shall be cULus listed and have a 5 year warranty, and be manufactured under
ISO 9001 International Quality Control Standards. Actuators shall be as
manufactured by Belimo. |
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Product Family
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