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
g
g
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
1
2
3
4
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
(Y1)
(Y2)
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
p
0052712
0
.2
.4
.6
.8
1
155
93
18
98
82
57
1
8.5
6.5
80
6.5
12.6
25
125
8...16
181
d0033712
B
C
III
