Belimo NF24A-SR-S2 Technical Data Sheet

Modulating spring return actuator with
emergency function for adjusting air
dampers in ventilation and air conditioning
systems in buildings
• For air dampers up to approx. 2 m
• Tor�ue ��� Nm Tor�ue ��� Nm ��� Nm
• Nominal voltage AC/DC 24 V
• Control�� modulating DC �� ... ��� V Control�� modulating DC �� ... ��� V
• Position feedback DC 2 ... ��� V
• Two integrated auxiliary switches Two integrated auxiliary switches
Technical data
Dimensions / Weight
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Technical data sheet
2
Electrical data
Nominal voltage
Nominal voltage range
Power consumption In operation
Auxiliary switch
Connection Motor
Functional data Torque Motor
Spring return
Control Control signal Y
Operating range
Position feedback (measuring voltage U)
Position accuracy
Direction of rotation Motor
Manual override
Angle of rotation
Running time Motor
Sound power level Motor
Service life
Position indication
Safety
Protection class
Degree of protection
EMC
Low-voltage directive
Certification
Mode of operation
Rated impulse voltage Actuator
Control pollution degree
Ambient temperature
Non-operating temperature
Ambient humidity
Maintenance
Dimensions
Weight
T2-NF24A-SR-S2 • en • v1.1 • 04.2011 • Subject to changes
At rest
For wire sizing
Auxiliary switch
Spring return
Spring return
Spring return
Auxiliary switch
AC 24 V, 50/60 Hz / DC 24 V
AC 19.2 ... 28.8 V / DC 21.6 ... 28.8 V
3.5 W @ nominal torque
2.5 W
5.5 VA
2 x SPDT, 1 mA ... 3 (0.5) A, AC 250 V
(1 x fix 10% / 1 x adjustable 10 ... 90%)
Cable 1 m, 4 x 0.75 mm 2
Cable 1 m, 6 x 0.75 mm 2
Min. 10 Nm @ nominal voltage
Min. 10 Nm
DC 0 ... 10 V, input impedance 100 k�
DC 2 ... 10 V
DC 2 ... 10 V, max. 0.5 mA
±5%
Reversible with switch /
Can be selected by mounting L / R
With hand crank and interlocking switch
Max. 95° , can be limited with
adjustable mechanical end stop
≤150 s (0 ... 10 Nm)
≤20 s @ –20 ... 50°C / max. 60 s @ –30°C
≤40 dB (A) @ 150 s running time
≤62 dB (A)
Min. 60,000 emergency positions
Mechanical
III Extra low voltage
UL Class 2 Supply
IP54
NEMA2, UL Enclosure Type 2
CE according to 2004/108/EC
CE according to 2006/95/EC
Certified to IEC/EN 60730-1 and IEC/EN 60730-2-14
cULus according to UL 60730-1A and UL 60730-2-14
and CAN/CSA E60730-1:02
Type 1.AA.B
0.8 kV
2.5 kV
3
–30 ... +50°C
–40 ... +80°C
95% r.h., non-condensating
Maintenance-free
See «Dimensions» on page 3
Approx. 2.0 kg
NF24A-SR-S2
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