NMB Series Direct coupled non-spring return actuator, 70in-lb minimum torqueActuator Type | Non fail-safe |
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Electrical Connection | cable |
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Direction of Rotation (Motor) | reversible with built-in switch |
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Power Consumption (Holding) | 0.4�W |
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Power Consumption (Running) | 2.5 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 | external push button |
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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 up to 1.05" in diameter by means
of its universal clamp, 1/2? self centered default. 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 or master-slave
applications |
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Servicing | maintenance free |
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Power Supply | 24 VAC � 20% 50/60 Hz
24 VDC � 10% |
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Transformer Sizing | 5 VA (Class 2 power source) |
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Electrical Connection | 18 GA plenum rated cable 1/2? conduit connector protected NEMA 2 (IP54) 3 ft [1m] 10 ft [3m] 16 ft [5m] |
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Overload Protection | electronic throughout 0 to 95� rotation |
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Input Impedance | 100 k� (0.1 mA), 500 � |
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Angle of Rotation | max. 95�, adjustable with mechanical stop |
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Manual Override | external push button |
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Housing | NEMA 2, IP54, UL enclosure type 2 |
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Agency Listings | cULus acc. to UL 60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EEC and 2006/95/EC |
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Operating Range Y | 2 to 10 VDC, 4 to 20 mA |
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Position Indication | reflective visual indicator (snap-on) |
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Ambient temperature | -22�F to 122�F [-30�C to 50�C] |
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Humidity | 5 to 95% RH non condensing (EN 60730-1) |
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Running Time | 150 seconds 95 seconds 60 seconds 45 seconds constant independent of load |
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Direction of Rotation | reversible with switch
actuator will move:
=CCW with decreasing control signal (10 to 2V)
=CW with decreasing control signal (10 to 2V) |
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Storage temperature | -40�F to 176�F [-40�C to 80�C] |
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Power consumption | 2.5 W (0.4 W) |
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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 NMB(X) 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 NMB(X)24-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.
Add-on auxiliary switches or feedback potentiometers are easily fastened directly onto
the actuator body for signaling and switching functions |
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Typical Specification | Proportional control damper actuators shall be electronic direct-coupled type, which
require no crank arm and linkage and be capable of direct mounting to a shaft up
to 1.05? diameter. Actuators must provide proportional 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. Actuators shall have brushless DC motor
technology and be protected from overload at all angles of rotation. Actuators shall
have reversing switch and manual override on the cover. If required, actuator will
be provided with screw terminal strip for electrical connections (NMX24-SR-T). Run
time shall be constant and independent of torque. A 2 to 10 VDC feedback signal
shall be provided for position indication. Actuators shall be cULus listed, 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
All orders are shipped same-day if the order is received by 1:00 PM Central Time. We ship worldwide.
UPS Hoilday Delivery Schedule
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You can also find answers to some common questions on our FAQ page
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