NF24A-SR-S2
Modulating spring return actuator, AC/DC 24 V, ��� Nm,
with two auxiliary switches
2 / 3
T2-NF24A-SR-S2 • en • v1.1 • 04.2011 • Subject to changes
www.belimo.com
Safety notes
!
• The actuator is not allowed to be used outside the specified field of application, especially in
aircraft or in any other airborne means of transport.
• It may only be installed by suitably trained personnel. Any legal regulations or regulations
issued by authorities must be observed during assembly.
• The device may only be opened at the manufacturer's site. It does not contain any parts that
can be replaced or repaired by the user.
• The cable must not be removed from the device.
• When calculating the re�uired tor�ue, the specifications supplied by the damper manufacturers
(cross-section, design, installation site), and the air flow conditions must be observed.
• The integrated switches of this actuator have to be connected either to Power supply voltage
or safety extra low voltage. The combination Power supply voltage / safety extra low voltage
is not allowed.
• The device contains electrical and electronic components and is not allowed to be disposed
of as household refuse. All locally valid regulations and re�uirements must be observed.
Product features
Mode of operation
The actuator is controlled with a standard signal of DC 0 ... 10 V and moves the damper to the
operating position at the same time as tensioning the return spring. The damper is turned back
to the emergency position by spring force if the supply voltage is interrupted.
Simple direct mounting
Simple direct mounting on the damper spindle with a universal spindle clamp, supplied with an
anti-rotation strap to prevent the actuator from rotating.
Manual override
Manual operation of the damper with the hand crank, locking in any position with the interlocking
switch.
Einstellbarer Drehwinkel
Adjustable angle of rotation with mechanical end stop.
High operational reliability
The actuator is overload-proof, requires no limit switches and automatically stops when the end
stop is reached.
Flexible signalization
The actuator has one auxiliary switch with a fixed setting and one adjustable auxiliary switch.
They permit a 10% or 10 ... 90% angle of rotation to be signalled.
Electrical installation
Wiring diagram
1
3
2
5
Y
U
DC 0
…
10 V
DC 2
…
10 V
– +
T
~
S1 S2 S3 S4 S5 S6
<A
>A
<B
>B
A
=
10%
B
=
10
...
90%
230 V
+
+
+
+
230 V
24 V
24 V
230 V
24 V
24 V
230 V
�
Cable colours��
1 = black
2 = red
3 = white
5 = orange
S1 = violet
S2 = red
S3 = white
S4 = orange
S5 = pink
S6 = grey
Direction of rotation
Y = 0
Y = 0
Y = 0
Y = 0
R
L
Notes
• Connect via safety isolation transformer.
• Parallel connection of other actuators possible.
Note the performance data.
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