Belimo LF-2 Series Product Information

ENG-2012.11 • Subject to technical changes
Auxiliary switch (LF24-S) 1 x SPDT 6 (1.5) A, AC 250 V
– Switching point
adjustable 0...100%
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 5 W
– holding 2.5 W
Connecting cable – motor 1 m long, 2 x 0.75 mm
2
– auxiliary switch (LF24-S) 1 m long, 3 x 0.75 mm
2
Technical data LF24, LF24-S
12
LF24-S
S1 S2 S3
M
LF24
M
Parallel connection of several actuators is
possible. Power consumption must be observed.
~
-
+
T
AC 24 V
DC 24 V
Connect via safety
isolating transformer
!
> x
< x
x = 0...100%
Application
For the operation of air dampers that
perform safety functions (e.g. frost and
smoke protection, hygiene, etc.).
Mode of operation
The LF... actuator moves the damper to its
normal working position 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
adjustable with built-in stop.
High functional reliability
The actuator is overload proof, needs no
limit switches and halts automatically at
the end stop.
Flexible signalling 0...100% , with ad-
justable auxiliary switch (LF24-S only).
Adjusting the auxiliary switch LF24-S,
page 6
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
Open/Close actuator
(AC/DC 24 V)
Control by single-pole contact
Dimensions
Wiring diagram
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
Low Voltage Directive CE according to 2006/95/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
Angle of rotation max. 95°
(adjustable 37...100% with built-in
mechanical stop)
Running time – motor 40...75 s (0...4 Nm)
– spring return 5 20 s @ –20...50 °C / max. 60 s @ – 30 °C
Sound power level motor max. 50 dB (A), spring 5 62 dB (A)
Service life min. 60 000 operations
For wire sizing 7 VA (Imax 5.8 A @ 5 ms)
Direction of rotation selected by mounting L/R
4
LF24, LF24-S Spring return actuators 4 Nm
p0050712
w0108712
d0001707
0
.2
.4
.6
.8
1
155
9318
98
82
57 18.56.5
80
49
6.5
12.6
25
125
8...16
181
d0032712
BC
III

Belimo LF-2 Series Specifications

General

Brand	Belimo
Model	LF-2 Series
Category	Controller
Language	English