6.1 Selecting the astronomical function
The time switch provides 5 astronomical functions.
For setting: see Table 1, point 4.5
Longitude and latitude: the twilight times depend on the geo-
graphical position of the place of operation. The default setting is
50° north (latitude) and 10° east (longitude), corresponding roughly
to the geographical position of Frankfurt/Main, Germany.
Clock zone: The standard clock zone is set for Central Europe.
The value must be changed corresponding to the place of opera-
tion.
Other cities are listed in the enclosed leaflet together with
their longitudes/latitudes and clock zones. For the setting
of other values, see Table 1.
Sun below horizon: the time switch calculates the current twilight
times based on the angles entered. The default setting is an angle
of 6°, corresponding to the “civil twilight“ (12° ≡ nautical twilight,
18° ≡ astronomical twilight).
For setting other values, see Table 1.
Morning and evening time differential: the time differentials
enable the twilight switching points to be shifted and determine the
morning and evening switch-on duration (see Table 1). The setting
0:00 makes the time differentials ineffective. Only effective for the
functions A1 and A2.
Twilight switching points: when an astronomical function has
been selected, the clock calculates the current twilight times.
These are recalculated at 0:00 h on each subsequent day.
The twilight times are stored as special switching points and can
be displayed by pressing the s button:
The time is displayed, the colon flashes.
sThe dawn switching point is displayed.
Pressing s again displays the dusk switching point.
The date must be entered when using the automatic
summer/winter time switchover and astronomical func-
tions. If the astronomical function is deactivated (= A0),
no twilight switching points are displayed.
6.2 Astronomical function A1
In astronomical function A1, the dusk switching point acts as a
switch-on point and the dawn switching point as a switch-off point.
Function A1 also provides the possibility to shift the calculated
twilight switching points. One time differential each can be set for
both the dawn and the dusk switching points, enabling execution of
the twilight switching points to be advanced or retarded. In the
case of a negative differential value, the switching point is acti-
vated correspondingly earlier, with a positive value correspondingly
later. To change the programmed default settings,
see Table 1.
Activating astronomical function A1 makes additionally
set switching points ineffective. This applies to the One-
channel timer as well as channel A of the Two-channel
timer.
6.3 Astronomical function A2
Function A2 enables the switching on of a consumer item after
dusk or before dawn for a desired period of time.
The period during which the consumer item (e.g. a light) is
switched on after dusk is determined by the evening time differen-
tial. The morning time differential determines the duration of
switch-on time before dawn (see Table 1).
If one of the switching sequences is not to be executed in the
evening or morning, the corresponding time differential must be set
at 0:00.
Activating astronomical function A2 makes additionally
set switching points ineffective. This applies to the One-
channel timer as well as channel A of the Two-channel
timer.
6.4 Astronomical function A3 (AND-linked)
Function A3 links the switching points entered for channel A with
the twilight times. Only switching function set to operate which in
twilight time and are linked with two additional ON-OFF-switching
points.
ON-switching point switches ON
OFF-switching point switches OFF
Example 1
Switching point 15:00 ON 22:00 OFF
Dusk/dawn 20:00 7:00
Consumer ON 20:00 to 22:00
Table 3
In example 1, the time switch switches the consumer item ON at
20:00 and OFF again at 22:00. If dusk begins after 22:00, the swit-
ching point is ignored, and the consumer item is not switched on.
Example 2
Switching point 5:00 ON 22:00 OFF
Dusk/dawn 20:00 7:00
Consumer ON 20:00 to 22:00 5:00 to 7:00
Table 4
In example 2, the time switch switches the consumer item ON at
20:00 and off at 22:00 the next morning ON at 5:00 and OFF at
7:00. If dusk begins after 22:00, and dawn before 5:00, the pro-
grammed switching points are ignored.
6.5 Astronomical function A4 (OR-linked)
Function A4 facilitates another way of linking the twilight times with
the switching points entered for channel A. Switch-on phases
stipulated via switch-on and switch-off points and the switch-on
phase between dusk and dawn have equal status. The conse-
quence of this for channel A is that the switch-on phases overlap.
