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SC28.

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Programming manual Astro-switching

 

SC 28 

 

 

 Monday 

 Tuesday 

 Wednesday 

 Thursday 

 Friday 

 Saturday 

 Sunday 

 

   Channel ON 

         

   Channel OFF 

In mode AUTO manual  
switching possible by pressing  
relevant keys.

 

Programming 

 

Key functions 

  Menu   Selection of programming modes 

 

 

AUTO 

 PR 

 ? 

 

 

 S/W 

 AUTO ... 

CL

 ] 

CL

ear programmed switch commands in 

modes PR; ? and   . 

[

]  In PR; ?;

 

 

and S/W modes: 

 

Select function option of flashing digit resp. 

position.  

 

In Mode ?: Change selected inputs. 

O.K.

] Confirm the selected mode. 

 

In PR and

 

 modes:  

Advance to required position. (forwards)  

In? mode:  

Advance to next switching time. 

In S/W mode: 

Enter into memory. 

[

]  In PR and

 

 modes:  

Return to required position. (backwards)  

In ? mode: 

Return to previous switching time. 

A

 ]  In AUTO mode: 

B

 ]  Press for manual override ON or OFF in 

 

relevant channel. Holding down key for 3  

 

seconds will switch ON or OFF PERM override. 

perm

 will be displayed. Programmed switching 

functions of relevant channel are suppressed. 

 

Cancel permanent ON or OFF by holding down 

key for a further 3 seconds, 

perm 

will disappear. 

Programming advice 

The default setting on delivery is programmed real 

time and date, the summertime change is 

activated.

 

Battery power reserve: 

Either without external power, or during a supply 

interruption, by operating the O.K. button the display 

comes on and switching commands can be 

programmed.

 

Make inputs step by step. The appropriate position in 

the display is flashing and can be changed by pressing 

 key. Advance to next position by using 

O.K.

 key,

 

go 

backwards by using 

 key. Inputs are terminated 

when flashing finishes. 

Installation details 

Caution: The installation and assembly of electrical 

equipment must be only carried out only by a 

skilled person. 

Connect to voltage and frequency according to type 

label only.

 

Warranty void if housing opened by unauthorised 

person. 
The high density electronic circuit is protected against 

a wide range of external influences. Incorrect operating 

may occur if external influences exceed certain limits. 

Reset 

Pressing recessed button in the middle of 

 key and 

CL

 key, will clear date, real time and microprocessor 

Switching programmes normally will not be affected. 

(Check by Read – Out; “?”mode) 

 

The   mode is selected because date and real time 

must be programme new. 

 

Operating modes 

AUTO

 Display

 

of time, day of week, current switch 

status of channel(s). Bar graph display of ON 

time. Display the current sunset-time (ON) by 

operating the 

O.K.

 key and the sunrise-time 

(OFF) by operating the 

O.K.

 key a second time. 

Manual overriding possible (key A, B) 

PR

 

Input of switching commands according to 

week day(s) and time

 

Use arrow 

 and 

O.K.

 keys to alter flashing digit. 

Use diamond 

 key to increase value.  

(Confirm last input with 

O.K.

 key, will enter into 

memory) 

?

 

Displays number of free memory locations 

Selects the selected Astro-table

 

Show switching times 

Alter switching time 

Clear single or all switching times  

Use 

O.K.

 key forwards or 

 key backwards to 

display switching times. 

Use diamond 

 key to change (alter) 

displayed switching time.  

Use 

CL

 key to cancel the displayed switching 

time. 

Use 

CL

 key twice to cancel all switching times if 

number of free memory locations available 

displayed only

.

 

 

Input of actual date and time

 

Use arrow 

 and 

O.K.

 keys to alter flashing 

digit. 

Use diamond 

 key to increase value.  

(Confirm last input with 

O.K.

 key, will enter into 

memory and change into AUTO mode) 

S/W

 

To activate / deactivate the summer/winter 

time change over.

 

Use diamond 

 key to select automatic S/W – 

time change ON or OFF.  

(Confirm last input with 

O.K.

 key, will enter into 

memory and change into AUTO mode)

 

Astro-function 

• 

The switch function  OFF in Astro mode is alligned 

with sunrise 

• 

The switch function  ON in Astro mode is alligned 

with sunset 

• 

Each switch-time can be programmed alternatively 

as Astro, or as normal switch-time. 

• 

With the two channel version each channel can be 

programmed seperately to be Astro or normal 

switching function. 

• 

If the Astro-function is chosen for a switch-time, the 

sunrise (turning off) as well as sunset (turning on) 

times programmed for the current day will be shown 

in the Display - 

  - this time can be changed as required and 

becomes automatically modified each successive 

day in accordance with the chosen Astro table - 

  - the difference (offset) between the entered switch-

time and the sunrise/set-time is fixed for successive 

operations 

• 

The programmed switching times, (mode P), as well 

as the indicated Astro-switch times (mode?) are 

always applied exclusively to the current day. 

• 

In mode AUTO The current sunset-time can be read 

by pressing button O.K., and by pressing O.K.twice 

the current sunrise-time is displayed 

• 

In mode ? the matching astro-table must be chosen 

as the first step. 

Astro table –

 

custom on request

 

Table 

Location 

At 01 

Scotland 

At 02 

England North 

At 03 

England South 

At 04 

Ireland 

At 05 

Germany North 

At 06 

Germany Middle 

At 07 

Germany East 

At 08 

Germany South, Swiss North East,  

Austrian North 

At 09 

France Middle 

At 10 

France North East 

At 11 

France North West 

At 12 

France South East; Swiss East 

At 13 

France South West 

At 14 

Italy North, Swiss South, Austrian South 

At 15 

Italy Middle  

At 16 

Italy South 

Mode ?

 

Select time zone. (see table) 

Prior to programming switching commands it is 

necessary to select the installation time zone.

 

A different Astro-table can be chosen at anytime. The 

currently programmed Astro-switch times are 

automatically re-calculated after the selection of the 

new table. 

Programmed Astro-switch times can be checked, 

amended or deleted and input again.. 

Example:  Astro-table 05 (At 05) required. 

Start from:   Mode AUTO;  

 

Astro-table 01 (At 01) active. 

Push button 

 2x, & 

button 

O.K.

 1x 

 

 

Display of free 
programming 
commands 

Push button 

O.K.

 1x 

 

 

Push button 

 1x 

 

 

Push button 

 3x 

 

After programming, viewing or amending time zone, by 

pressing button

 O.K. 

switching commands can be 

viewed, programmed or amended. 

To return to AUTO mode press 

 button once.

 

 

Mounting advice 

 

 

 

DIN – rail – mounting 

 

 

Back view 
 
 
 
 

Wall mounting 

(Special cover required) 

Wiring diagrams 

SC 28.13 

 

SC 28.23 

 

 
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