Belimo NMB24-SR Quick Start Manual

NMB(X)24-SR(-T)
Proportional, Non-Spring Return, 24 V, for 2 to 10 VDC or 4 to 20 mA
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
100 kΩ (0.1 mA), 500 Ω
Input impedance
Angle of rotation max. 95°, adjustable with mechanical stop
Torque 90 in-lb [10 Nm]
Direction of rotation
reversible with
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.
800-543-9038 USA
253
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])
switch
866-805-7089 CANADA
1/2" to 1.05" [12.7 to 26.67]
2/5" to 1.05" [10 to 26.67]
3.66" [93]
4.88" [124]
0.98"
[25]
3.9" [99]
203-791-8396 LATIN AMERICA
To center of
mounting slot.
2" [50.8]