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BETA Switching
Timers
7
LF4 digital time switches
9/4
Siemens ET B1 · 10/2008
9
■
Technical specifications
1)
For 24 V devices (7LF4 421-2, 7LF4 422-2 and 7LF4 444-2):
Tolerance -10/+10 %; operating range 0.9 ... 1.1 x U
c
.
2)
For 24 V devices (7LF4 421-2, 7LF4 422-2 and 7LF4 444-2):
Frequency range 0 ... 60 Hz.
3)
For 24 V device (7LF4 444-2): P
v
= 4 VA.
4)
At 25 °C a clock error of +0.3 s is assumed. Accuracy may deviate by a
further ± 1 s around this value.
5)
A program consists of an ON time, an OFF time and assigned ON and OFF
days or day blocks.
Mini
Top
Profi
Astro
Expert
7
LF4 401-5
7
LF4 411
7
LF4 412
7
LF4 421
7
LF4 422
7
LF4 431
7
LF4 432
7
LF4 444
Standards
EN 60730-1, -2-7; VDE 0631-1, -2-7; UL 60730
Approved acc. to
VDE, UL 60730-1,-2-7/UL 917 CSA C22.2 No. 14 and 177
Supply
•
Rated control supply voltage U
c
V AC
V AC/DC
110 ... 240
--
120, 230
--
120, 230
24
230
--
120/230
24
-
Operating range
×U
c
0.85 ... 1.1
0.85 ... 1.1
0.85 ... 1.1
1)
0.85 ... 1.1
80 .. 253
V
1)
-
Frequency ranges
Hz
50 ... 60
50 ... 60
50 ... 60
2)
50 ... 60
50 ... 60
2)
•
Rated power dissipation P
v
VA 0.035
2
2
2
2.5/4
3)
Channels/contacts
•
Switching channels
1
1
or 2
4
-
Rated operational voltage U
e
V AC 250
-
Rated operational current
I
e
At p.f. = 1
A
16
At p.f. = 0.6
A
10
•
Contacts
1
CO
1
or 2 CO
4
CO
-
Mechanical switching cycles (in millions)
> 5
10
-
Electrical switching cycles
At p.f. = 1
6000 (20
A)
100 000
•
Minimum contact load
V; mA 12; 100
-
Incandescent lamp load
A
5
8
-
Fluorescent lamp load
At 7 F
VA 58
60
Uncorrected
VA 1400
Safety
•
Different phases permissible between drive/contact
Yes
•
Rated impulse withstand voltage U
imp
kV
4
-
EMC: burst
Acc. to IEC 61000-4-4 kV
> 4.4
-
EMC: surge
Acc. to IEC 61000-4-5 kV
> 2.0
-
Electrostatic discharge
Acc. to IEC 61000-4-2 kV
> 8.0
•
Power reserve storage
Mains/battery
a
6/2
6
5
-
Battery type
Li primary cell
•
Program memory
Non-volatile
--
Yes
•
Overvoltage category
Acc. to EN 61010-1
III
Function
•
Minimum switching sequences
1
min
1
s
•
Make and break cycles
1
min
1
s
•
Clock errors per day
Typical
s/day
+0.3
±
1
4)
±
0.86
±
0.2
•
Control input
Terminal S
--
Yes
•
Memory spaces
-
Programs
5)
28
56 (2
× 28)
28 (2
× 14)
4
× 3 × 28
-
Pulse (alternatively)
--
84
--
-
Pulse cycle
--
1
s ... < 60 min --
Terminals
•
Terminals ± screw (Pozidriv)
PZ 1
•
Conductor cross-sections of main current paths
-
Rigid, max.
mm
2
4
-
Rigid, min.
mm
2
1.5
-
Flexible with end sleeve
Max.
mm
2
2.5
Environmental conditions
•
Permissible ambient temperature
°C -10 ... +55
-20 ...
+55
•
Storage temperature
°C -20 ... +60
•
Resistance to climate
Acc. to EN 60068-1
10/055/21
20/055/21
•
Degree of protection
Acc. to EN 60529
IP20, with connected conductors
•
Safety class
Acc. to EN 60730-1
II
© Siemens AG 2008