24-Hour Digital Time Switches 7LF26 12 and 7LF26 14

24-Hour
Digital Time Switches
7LF26 12 and 7LF26 14
Power reserve 48 h, typ. (charging time approx. 100 h).
4 ON and 4 OFF programmable switch points.
Shortest switching interval 10 min.
Technical data
Switching
capacity
Rated
voltages UN
Rated
frequency
Voltage
tolerances
7LF26 12
7LF26 14
unity p.f. ... 16 A, 250 V AC
cos. ϕ = 0,6 lagging ... 2 A, 250 V AC
220...240 V, 50 Hz
220...240 V, 50 Hz
230 V, 60 Hz
230 V, 60 Hz
187...264 V, 50 Hz
187...244 V, 60 Hz
”9$9 50 Hz
Power
”9$9 50 Hz
consumption
”9$9 60 Hz
Type of switch
No contact,
Changeover contact,
single-pole
single-pole
Timing accuracy
± 1 s/day typ.
Permissible ambient temperature
- 5 °C to + 50 °C
Permissible storage temperature
- 5 °C to + 50 °C
Humidity class to DIN 40 040
F
Degree of protection to DIN 40 050
IP 20
Standards
DIN VDE 0633
Distribution board time switch
7LF26
• Snap-on fitting on 35 x 7.5 mm top-hat rail
to DIN/EN 50 022.
• Class ll protection against contacting is ensured by fitting
into
- housing type 5ST1 310
class of protection IP 40
- in small distribution boards
to DIN 57 603/VDE 0603/6.83
- in distribution boards
to DIN 57 659/VDE 0659/3.80
Operating instructions NZ 742d-1100
Subject to change
1
Connect switch as shown in diagram imprinted on it
2
Dimension drawings
(dimensions in mm)
• Max. conductor cross-section:
solid 4 mm2 or 2 x 2.5 mm2 or
finely stranded 4 mm2 or 2 x 1.5 mm2 or without
core ferrules
• The time switch must not be used for switching extra low safety
voltages to DIN 57 100/VDE 0100 Part 200, Section 11.9.
Note
The time switch contacts open on power failure. On recovery of
the voltage, the time switch automatically resumes its original
switching position.
Caution:
only authorized personnel should install the time
switches.
Time switch 7LF26
3
7LF26_12_14e
1 von 2
4
Before starting
1. Setting clock time
• If both Reset buttons are pressed simultaneously,
all previously programmed, switch points are cancelled*
and the clock resets to 00 : 00.
• write down the desired switch points
alternately for ON and OFF in the right sequence.
The time switch can be set only when the display is running
forward; for that reason
• keep the
button pressed down until the display approaches
the desired clock time, then
• jog the
button in minute steps until the exact clock time is set.
The colon must then flash.
Up to 8 switchpoints can be keyed in, i.e. 4 ON and 4 OFF
points with shortest interval of 10 min.
e.g. ON 14.30, OFF 14.40.
1.
2.
3.
2. Programming the switch points
4.
The switch points (previously annotated) are input as follows:
ON
Jog Prog. button, whereupon ON and OFF are shown
alternately for a total of 8 times.
At any ON or OFF instant, the desired switching time can
immediately be keyed in.
Proceed as under "1.Setting clock time".*
OFF
*) The switch first runs through a 7 s check program with
alternate numerical sequence.
Switching
status
ON
OFF
Button for
setting
Clock time and
Switching time
Display
Flashing colon:
Actual clock time,
Continuous colon:
Switch point
(visible only during
programming).
When Prog. is jogged for the 9th time, "E : nd" appears on
the display. When Prog. is jogged for the 10th time, actual
clock time shows.
The colon then flashes.
If programming is interruptet at any point, the actual clock time
is shown automatically after about 2 min.
*) Holding the
button down initiates fast running.
Jogging the
button causes the display to jump
in 10 min steps.
Button for
programming
5
6
3. Check programmed switch points
5. Permanent switching (P : er)
Jog Prog. button. ON and OFF switch points are shown
alternately. If storage locations are still empty ON or OFF
are shown without time display
or
press/jog
until display has run through 24 hours* and the
actual clock time reappears.
While display is running through, the switching of the
programmed times can be heard.
The time switch can be set to "Permanently ON" or
"Permanently OFF" at any time.
*) the programmed and actual switching status now coincide.
• Permanently ON
Press and hold Prog. button* until "ON P : er" appears.
• Permanently OFF
Jog Prog. button a second time "OFF P : er" appears.
• Cancelling permanent switching
• Press/jog
button and run through 24-h cycle until
actual clock-time is shown. The original inputted switching
program is reinstated.
4. Cancelling or resetting switch points
6. Summer time - Winter time
Jog Prog. button until the switch point is shown which is to be
cancelled or reset, then
• Setting summer time
• Jog
button until actual clock time is advanced by one hour.
Jog
button; switch time disappears: only ON or OFF remain.
• Cancelling press Prog. button unit "E : nd" appears,
followed by the actual clock time.
• Resetting, press or jog
button until desired switchingtime appears.
Actual clock time appears after further jogging of Prog.
• Setting winter time
• Jog
button until clock time is advanced by 23 hours,
i.e. the actual clock time is retarded by 1 hour.
*) for at least 2 seconds
7
7LF26_12_14e
2 von 2
8