ENG-2012.11 • Subject to technical changes
Nominal voltage range AC 19.2...28.8 V, DC 21.6...28.8 V
Nominal voltage AC 24 V 50/60 Hz, DC 24 V
Power consumption
– motoring 2.5 W
– holding 1 W
Connecting cable 1 m long, 4 x 0.75 mm
2
Technical data LF24-3
LF24-3
gg
Parallel connection of several actuators is
possible. Power consumption must be observed.
Connect via safety
isolating transformer
!
T
~
AC 24 V
-
+
DC 24 V
Y
1234
1
Y
2
T
~
-
+
a
b
L
0
.2
.4
.6
.8
1
R
0
.2
.4
.6
.8
1
stop
stop
stop
stop
a
b
(Y
1
)
(Y
2
)
R
L
R
L
Reversing switch
Mounting side
Position indication mechanical
Protection class
(safety extra-low voltage)
Maintenance maintenance-free
Weight 1400 g
Degree of protection IP 54
EMC CE according to 2004/108/EEC
Ambient temp. range – 30...+ 50 °C
Non-operating temp. – 40...+ 80 °C
Humidity test to EN 60730-1
Torque – motor min. 4 Nm
(at rated voltage)
– spring return min. 4 Nm
Direction of rotation – motor selected with switch L/R
– spring return selected by L/R mounting
Input resistance
Control inputs Y1, Y2 1000 1 (0.6 W)
Angle of rotation max. 95°
(adjustable 37...100% with built-in
mechanical stop)
Running time – motor 150 s
– spring return
5 20 s
@ –20...50 °C /
max. 60 s
@ –30 °C
Sound power level motor max. 30 dB (A), spring 5 62 dB (A)
Service life min. 60 000 operations
For wire sizing 5 VA (Imax 5.8 A @ 5 ms)
Application
For the operation of air dampers that
perform safety functions (e.g. frost and
smoke protection, hygiene, etc.).
Mode of operation
The LF24-3 is controlled by a 3-point sig-
nal. The actuator runs to the position spe-
cified by the control signal while tensioning
the return spring at the same time. If the
power supply is interrupted, the energy
stored in the spring moves the damper
back to its safe position.
Product features
Simple direct mounting on the damper
spindle by universal spindle clamp. An anti-
rotation device is supplied to prevent un-
wanted rotation of the whole unit.
Mechanical angle of rotation limiting ad-
justable with built-in stop.
High functional reliability
The actuator is overload proof, needs no
limit switches and halts automatically at
the end stop.
Examples of control modes, page 8
Mounting accessories, page 11
Mounting instructions, pages 13...15
Important: Read the notes about the use
and torque requirements of the damper
actuators on page 3.
Dampers up to approx. 0.8 m
2
Modulating actuator
(AC/DC 24 V)
3-point control
Dimensions
7
LF24-3 Spring return actuator 4 Nm
Wiring diagram
w0112712
p0052712
0
.2
.4
.6
.8
1
155
9318
98
82
57 18.56.5
80
6.5
12.6
25
125
8...16
181
d0033712
BC
III
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