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Application
The type LF24-MFT(2) is intended for the
operation of air control dampers with
safety function in ventilation and air-con-
ditioning systems.
Mode of operation
The basic parameters for normal appli-
cations of the LF24-MFT(2) actuator are
assigned during manufacture at the fac-
tory. The actuator is controlled by a stan-
dard DC 2...10 V signal. The actuator runs
to the position specified by the control sig-
nal while tensioning the return spring at the
same time. If the power supply is interrup-
ted, the energy stored in the spring moves
the damper back to its safe position.
For making service adjustments to the
system, these parameters can be chan-
ged when necessary using the MFT-
Handy, or PC-Tool MFT-P (see Operating
Instructions MFT-H).
Technical data
Basic values for the LF24-MFT(2)
Nominal voltage
AC 24 V 50/60 Hz, DC 24 V
Nominal voltage range AC 19.2...28.8 V, DC 21.6...35 V
For wire sizing
5 VA (Imax 5.8 A @ 5 ms)
Power consumption
running: 2.5 W, at rest: 1.2 W
Connecting cable
1 m long, 4 x 0.75 mm
Control signal Y
DC 0...10 V
Operating range
DC 2...10 V
Function
position feedback U 5
DC 2...10 V
Positioning accuracy
± 5%
Direction of rotation
– Motor
selected with switch L / R
– Spring return
selected by L / R mounting
Direction of rotation
(bei Y = 0 V)
Torque
– Motor
– Spring return 4 Nm
Angle of rotation
max. 95°
built-in mechanical stop)
Running time: – Motor
150 s
– Spring return ≈ 20 s @ -20...50°C / max. 60 s @ -30°C
Switching L-R twice or R-L-R triggers automatic adaption of
Angle of rotation
running time, working range and measuring signal U to the
adaption
MIN-MAX control range or the mechanical angle of rotation.
Override control
MAX (Max. Position)
MIN (Min. Position)
ZS
Sound power level
– Motor
– Spring return ≈ 62 dB(A)
Service life
min. 60 000 operations
Position indication
mechanical
Protection class
(safety low voltage)
III
Degree of protection
IP 54
Ambient temp. range
– 30...+ 50°C
Non-operating temp.
– 40...+ 80°C
Humidity test
to EN 60730-1
EMC
CE according to 89/336/EEC
Software classe A
Mode of operation Type 1
Maintenance
maintenance-free
Note: If the product bears an extra
number (LFxxxxxx) in addition to the
designation LF24-MFT(2) it means that it
is a special version of the LF24-MFT(2)
which has been parameterized at the
factory. In this case the relevant techni-
cal data will be that on the attached
Configuration Sheet.
Basic position
As soon as the actuator is powered up it
automatically senses its safety position
(zero initialising). The process takes
approximately 8 secondes (while the
actuator remains stationary). The actuator
then runs to the position demanded by the
control signal.
Simple direct mounting on the damper
spindle by universal spindle clamp. An
antirotation device is supplied to prevent
unwanted rotation of the whole unit (p.12).
2
(0...32 V) @ Ri 100 kΩ
@ max. 0.5 mA
at switch position L
resp. R
4 Nm
(at rated voltage)
(adjustable 37...100%
with
)
= 100%
=
0%
(Mid. position)
= 50%
30 dB (A)
LF24-MFT(2) Spring return actuator 4 Nm
variable
These values can be
adjusted with the
MFT-Handy, or PC-Tool
MFT-P, (see also
Operating Instructions
MFT-H).
DC 0.5...32 V, Open/Close,
3-point @ Ri 1.5 kΩ
Start
DC 0.5...30 V
Finish
DC 2.5...32 V
Measuring signal U 5
Start
DC 0.5...8 V
Finish
DC 2.5...10 V
<
Soft-switch S1 1...99%
)
<
Soft-switch S2 1...99%
)
Maintenance and fault
alarms
electronically reversible
electronic angle of rotation
limiting 0...100%
75...300 s
*
No adaption
Automatic adaption is triggered at
each power-up
<
MAX 0...100% of
)
MIN 0...100% of MAX
ZS
0...100% of MAX-MIN
*
Note!
Remember that the sound
power level can change too
when the running time is
changed (see diagrams in
the MFT2 documentation ).
For further information on
applications in bus systems
refer to the MFT2 documen-
tation.
Adjustable
angle
of
rotation
mechanical stops (page 12).
High functional reliability
The actuator is overload-proof, needs no
limit switches and halts automatically at
the end stops.
Note: When calculating the torque
required to operate dampers, it is essen-
tial to take into account all the data sup-
plied by the damper manufacturer con-
cerning cross sectional area, design,
mounting and air flow conditions.
Danger: Power supply via safety isola-
ting transformer. The enclosure of
the actuator equipment must only be
opened by the manufacturer. It contains
no components which the user can
replace or repair.
Wiring diagrams
Wiring diagram, modulating operation
(basic value)
AC 24 V
-
+
DC 24 V
Y
DC 0...10 V (0...32 V)
U 5
DC 2...10 V
1
2
3
5
adjustable
U MP
Y
-
LF24-MFT(2)
Z
+
Wiring diagram, 3-point operation
(spec. parameters)
AC 24 V
U 5
1
2
3
5
Y
U MP
-
LF24-MFT(2)/Spec.
Z
+
Wiring diagram, Open/Close operation
(spec. parameters)
AC 24 V
-
+
DC 24 V
U 5
1
2
3
5
Y
U MP
-
LF24-MFT(2)/Spec.
Z
+
with
GB
5
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