Dimmer time switch

AlphaLux³ D21
4126 26 / 27 ®

! Safety notes
This product should be installed in line with installation rules, preferably by a qualified electrician. Incorrect installation and
use can lead to risk of electric shock or fire. Before carrying out the installation read the instructions and take account of
the product’s specific mounting location. Do not open up, dismantle, alter or modify the device except where specifical-
ly required to do so by the instructions. All Legrand products must be opened and repaired exclusively by personnel trained
and approved by Legrand. Any unauthorised opening or repair completely cancels all liabilities and the rights to replacement
and guarantees. Use only Legrand brand accessories.

292716/06
The device contains a LiMnO2 primary cell. When the product reaches the end of its life, this cell must be correctly removed and
disposed of in accordance with national legislation and the requirements of environmental protection.
Technical data 4126 26 4126 27
Supply voltage 230 V 50/60 Hz 120 V 50/60 Hz
Effective power consumption ca. 1 W
Contact rating: 1 changeover contact 16 A 250 V~µ cos ϕ = 1
Parallel compensation 600 W max. 70 µF
Accuracy ~ 0,1 s / day
single strand multi strand
8 mm max. 1,4 Nm
1,5...4 mm2 1,5...2,5 mm2
Programmes 56
Battery reserve 5 years
Control line length max. 50 m
Delay 30 … 300 s
Switching threshold 1 lx … 100 klx
+
- -20° C … +60° C -20° C ... +60° C

+
- -20° C … +55° C -20° C ... +70° C

IP: IP: 65
IP 20
General information

Start-up: after applying the supply voltage, the time switch starts automatically with the last selected func-
tion. The relay position is set by the current program.
A program must be set in order for the device to function

Select menu, back to main menu,

Hold down > 1s = operating display

Confirm selection or load parameters

Select menu options or set parameters

For operating indicator: Display of lux value.

Select menu options or set parameters.

For operating indicator: Display of next switch time
 L
Supply voltage N 4128 60

Displays the brightness

value
Function Switch status
Receptacle
for data key Day, Time, Date

2 1 4

max. 16 A

max. 250 V AC R c

Operating principle: Typ 1.B. S. T.

4000 W 2000 VA 600 W 70µF 2000 W
IEC/EN 60730-1, IEC/EN 60730-2-7
Montage (time switch): in distribution panel,
Degree of contamination: 2 + +
+
Switch output, potential-free LED
Rated impulse voltage: 4 kV 2000 W 2000 W 2000 W 1000 W 1000 W
Overview

2 3 1 7 4

8
9
6


 This symbol indicates that
5 the selection is active.
A Set language 2 Set time/date, summertime/wintertime

Summertime: ± 1 hour
Europe: Factory set
SPECIAL: The switchover to/from
summertime can be freely programmed by entering
a start date and end date and is then executed each
year on the same day of the week, e.g. Sunday
2 Settings for brightness-dependent switching

The delay time prevents switching back and

forth when brightness and darkness change
quickly (e.g. clouds passing by).
The default setting is 90 seconds. The setting
range is from 30 to 300 seconds.

The time switch compares the brightness value measured at regular intervals to the set switch-on and
switch-off threshold. If the set brightness value drops below the set switching threshold, the time switch
switches on the connected light sources. If the set brightness value exceeds the set switching threshold,
the time switch switches off the connected light sources.
The switching thresholds can be set separately between 1 lx and 100 klx.
3 Programming

A program must be set in order for the device to function.

Switching on Switching off

1 Time Time
2 Brightness Brightness
3
Brightness + Time Brightness + Time
4 Brightness Time
5 Time Brightness

A program consists of an ON time, OFF time and associated on and off days.
Programs with predefined on/off days Mon to Sun. For this program, you only need to set the switching
times.
With the „INDIVIDUAL” option, you can allocate switching times to specific days of your choice.
The programs of a channel are combined with a logical OR.
3 Programming

Set MON and TUES

*
as on/off days

*
CHRONO = All switch commands are executed in chronological order in a week
INPUT = Programs are executed in the order in which they are entered
Programming examples
Switching on and off exclusively time-controlled

ON
OFF
0h 3 6 9 12 15 18 21 24h

t
0h 3 6 9 12 15 18 21 24h

ON
OFF
Select the appropriate symbol with the PLUS and
MINUS keys:
Switching on in acc. with preset switch-on threshold

Switching off in acc. with preset switch-off threshold

ON/OFF at programmed time

Switching on / off in acc. with
switch-on/off threshold in specified
period
Switching on and off exclusively dependent on brightness

t
0h 3 6 9 12 15 18 21 24h

ON
OFF

1 lx…100 klx

h
t 24 6 12 18 24
0h 3 6 9 12 15 18 21 24h

30s…300s t
ON 1

OFF 0
The time switch compares the brightness value measured at regular intervals to the set switch-on and
switch-off threshold.
If the set brightness value drops below the set switching threshold, the time switch switches on the connec-
ted light sources. If the set brightness value exceeds the set switching threshold, the time switch switches
off the connected light sources.
The switching thresholds can be set separately between 1 lx and 100 klx.
Within a specified switch-on/off time, the brightness determines the switching times

t
0h 3 6 9 12 15 18 21 24h

ON
OFF

t
0h 3 6 9 12 15 18 21 24h

ON
OFF
1 lx…100 klx

h
24 6 12 18 24

30s…300s t

1
PROG
0

0
Switching on brightness-dependent, switching off time-controlled

t
0h 3 6 9 12 15 18 21 24h

ON
OFF

t
0h 3 6 9 12 15 18 21 24h

ON
OFF
Switching on time-controlled, switching off brightness-dependent

t
0h 3 6 9 12 15 18 21 24h

ON
OFF
4 Modes
• Auto - Automatic operation
• Constant ON
• Constant OFF
• Extra
The switch status imposed by the program is inverted (manual override).
With the next effective switch command, the time switch resumes control
of on/off switching.

5 Contrast adjustment  1 h-Test

When this function is activated, the output is switched on
for one hour.

After one hour, the time switch returns automatically to

the programmed mode.
 Data key

or

4 128 72/73
Load the programs of the time switch on to a data key (WRITE KEY)
Warning! all programs stored on the data key will be overwritten.

or

Load the programs from the data key to the time switch (READ KEY)
Warning! all programs programmed in the time switch will be overwritten.
 Hour counter
Displays the total relay ON time, (0 to 65535 h) and the date of the last reset.

 Random function
Function to simulate presence.
Function active: the programmed switching cycles are shifted at random within the range of ± 15 minutes.
 Pincode

PIN CODE active: The menus of the time switch will not be accessible unless the PIN CODE has been
entered. When the pin code is active, access to the button and key functions is disabled 1 minute after the
last button press.
PIN free access can be re-enabled by selecting PASSIVE or by resetting the device.

Example
 Holiday

After activation the holiday program is executed between 0:00h on the start date and 24:00h on the end
date (Constant ON/OFF). After the holiday program has run once, it must be reactivated.
 Activating and deactivating grid synchronisation

The default setting is PASSIVE. In order to improve the long-term accuracy, it is advisable to activate
synchronisation if the time switch is supplied from a on 50/60 Hz grid with frequency adjustment.
 Cycle function

For cyclical switch commands the switching on time is set by logical “OR“ of programs of all types. A fixed
cycle of ON and OFF time then operates within those limits. The cycle always starts with the ON time.
The cycle duration and the ON time within the cycle are the same length for all switching times. The cycle
duration and the ON time can be set independently in one-second increments. If the switching time is shor-
ter than the cycle duration, the cycle will be shortened accordingly. The ON time will remain unchanged. If
the switching time is actually shorter than the ON time, the ON time will be shortened accordingly.

min max
Periode 2s 2h
Impuls 1s 1h 59min 59s
 15:00:00 15:10:00 15:20:00 15:30:00
0:10:00 0:10:00 0:10:00
15:32:00

Programm n
Programm 1

Relais
0:04:00 0:04:00 0:04:00
 1 10 100 1k 10k 100k

No sensor connected, cable break or short circuit

 Warning: Elektrical shock - Disconnect all power from the
Reset device before dismantling the module and replacing the
Warning!
battery.
The memory will be cleared,
Always use a Li cell type battery (LiMnO2) CR2477, 3V
and all set data will be lost.
high temperature type min +85 °C
Hold down for more than 3 seconds
and at the same time press and release
.

The language, time, date, summertime/

wintertime, delay time, switching thresholds
and switching times will have to be
re-entered.

+
2