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253
NMB(X)24-SR(-T)
Proportional, Non-Spring Return, 24 V, for 2 to 10 VDC or 4 to 20 mA
Torque min. 90 in-lb for control of damper surfaces up to 22 sq ft.
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
Ω
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 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.
Dimensions
(Inches [mm])
2.36”
[60]
3.15”
[80]
4.88” [124]
3.66” [93]
3.9” [99]
0.98”
[25]
2.42”
[61.4]
2” [50.8]
1/2” to 1.05” [12.7 to 26.67]
2/5” to 1.05” [10 to 26.67]
To center of
mounting slot.
D
121
Technical Data
NMB(X)24-SR(-T)
Power supply
24 VAC ± 20% 50/60 Hz
24 VDC ± 10%
Power consumption
2.5 W (0.4 W)
Transformer sizing
5 VA (Class 2 power source)
Electrical connection
18 GA plenum rated cable
1/2” conduit connector
protected NEMA 2 (IP54)
3 ft [1m] 10 ft [3m] 16 ft [5m]
Overload protection
electronic throughout 0 to 95° rotation
Operating range Y
2 to 10 VDC, 4 to 20 mA
Input impedance
100 k
Ω
(0.1 mA), 500
Ω
Angle of rotation
max. 95°, adjustable with mechanical stop
Torque
90 in-lb [10 Nm]
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)
Position indication
reflective visual indicator (snap-on)
Manual override
external push button
Running time
150 seconds 95 seconds 60 seconds 45 seconds
constant independent of load
Humidity
5 to 95% RH non condensing (EN 60730-1)
Ambient temperature
-22°F to 122°F [-30°C to 50°C]
Storage temperature
-40°F to 176°F [-40°C to 80°C]
Housing
NEMA 2, IP54, UL enclosure type 2
Housing material
UL94-5VA
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
Noise level
<45dB(A)
Servicing
maintenance free
Quality standard
ISO 9001
Weight
1.7 lbs [0.75 kg]
NMB(X)24-SR-T
Electrical connection
screw terminal (for 26 to 14 GA wire)
unprotected (NEMA 1/IP20)
† Rated Impulse Voltage 800V, Type of action 1, Control Pollution Degree 3.
M
40024 - 05/10 - Subject to change.
© Belimo
Aircontrols (USA),
Inc.
