Siemens BUD 5241 User manual

Siemens Building Technologies CA2N5241E / 11.1998
Landis & Staefa Division 1/4
5241
Digital time switch BUD
Digital time switch used to switch plant on and off, or for the control
of setback periods at night and weekends.
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Suitable for mounting on DIN rails
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Quartz-controlled microprocessor time switch
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Simple programming
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Manual on/off control
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Holiday programming of up to 45 days
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Digital input and digital display of clock functions
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Summer/winter change-over
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Scope for checking programmed switch times and making individual corrections
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Power reserve of 72 hours
The microprocessor automatically stores the programmed times in chronological order.
The time switch operates in one of three modes: continuously On, continuously Off or
operated automatically via the time programme.
The power supply is buffered by a memory back-up capacitor. In the event of a power
failure the clock will continue to run, with the programme retained, for 72 hours.
However, the relay will go to (or remain in) the normal position (71 / 72 made).
When placing an order, please specify the quantity, product description and type code.
Example: 2 Digital time switches BUD
Sheet steel housing, printed circuit board with LCD display and programming buttons.
Mounting instructions (Ref. 35654) are enclosed with the digital time switch.
Although microprocessor protection is provided, unusually strong electromagnetic fields
could cause interference.
To avoid interference:
– The device should not be installed close to inductive components
– A separate AC 24 V supply must be provided (if necessary use a mains filter)
– Inductive components must be fitted with interference suppressors (varistor / RC unit)
After clearing the cause of interference, the time switch must be reset.
– The connection terminals must be freely accessible.
– Ensure adequate air circulation to dissipate the heat generated during operation.
– Snap-on rail mounting. Rail type: EN50022-35x7.5
– 4 clear holes are provided for surface mounting
Functions
Ordering
Construction
Mounting notes
Mounting

CA2N5241E / 11.1998 Siemens Building Technologies
2/4 Landis & Staefa Division
12345671 7
mhd
Display panel
Minutes
Hours
Day
Time
Enter / read
programme
Manual control
40567en
–>
Prog.
Display and indicators
1 ... 7 days (1 = Monday)
1 -> 7 Daily programme
ON/OFF Switch status
00:00 Hours and minutes
H Holiday programme
Keys
To entrer clock time, day and programme
When programme entry is complete, the display will show the current time after a delay
of 40 seconds. This is an automatic function which will also occur if the input is inter-
rupted for more than 40 seconds. In this case, the last not saved programme point must
be re-entered.
After connection to the power supply, press d+ m+ + simultaneously,
to clear / reset the time switch.
Keep the key depressed throughout the setting procedure.
– Press the dkey to move the arrow to indicate the current day 1 ... 7 (1 = Monday)
– Use the hand mkeys to set the current time.
Release the key. The clock will now run.
A weekly programme with a maximum of four ON and four OFF switch-times can be
programmed for one, several or all days of the week, by means of a free block entry
option (see Example 1 below). If all blocks are used for one day, the subsequent days
must accept the same times.
Press Prog. key.
The display reads - -:- - followed by 1 ON in the right of the display, representing the
ON command for the first time period. Now press d. The arrow will flash above
1 (= Monday). If the switch command is to be carried out on Monday, enter Monday by
pressing the key. Other or additional weekdays can be selected by pressing d,
and entered by pressing .
If, for example, the command is to be carried out daily at the same time from Monday to
Friday, each of the numbers 1 ... 5 should be indicated by an arrow. For a switch
command applying to a full week, all days, 1 ... 7 should be marked by an arrow.
After selection of the switch days, use the hand mkeys to enter the switch-on time.
Save the switch command displayed by pressing Prog.
The 1 OFF indicator will now appear in the right of the display window, representing
the OFF command for the first time period. Select the days and OFF time as described
above, and store by pressing Prog. Repeat for time periods 2 to 4 as appropriate.
Press when programme entry is complete.
A building is occupied from 8.00 am to 5.30 pm Monday to Friday, and from 8.00 am to
1.00 pm on Saturdays. On Sunday the building is unoccupied.
Because the building is empty during the lunch-hour, the heating plant can be switched
off between 12.30 and 1.30 pm as an economy measure.
For comfort, normal plant on-time is 7.00 am, with an early start (one hour) on Mondays.
Time block Mon Tue Wed Thur Fri Sat Sun
1 On 06:00
Off 17:30 17:30 17:30 17:30 17:30
2 On 07:00 07:00 07:00 07:00 07:00
Off 12:30 12:30 12:30 12:30 12:30
3 On 13:30 13:30 13:30 13:30 13:30
Off 13:30
4 On ---- ---- ---- ---- ---- ----
Off ---- ---- ---- ---- ---- ----
Operating
Programming the BUD
Note
Start-up
Settin
g
da
y
and time
Weekl
y
pro
g
ramme
To start programme entry
Switch-on command
Switch-off command
Example 1
Time-switch settin
g
s

Siemens Building Technologies CA2N5241E / 11.1998
Landis & Staefa Division 3/4
After start-up (or after a reset), it is also possible to set a daily switch programme with
12 switching operations (6 On and 6 Off) by setting the actual times only, without
pressing d for the day of the week.
The daily programme is indicated by the arrow above 1 –> 7 .
Since during programming no days need to be entered, programme entry starts with the
switching times.
To display the programmed ON and OFF settings, press Prog.
Press after a review of these settings.
Recall the command by pressing Prog. and change it by pressing h, mand, if
necessary, d.
Alternatively, clear the displayed command by pressing h+ msimultaneously.
Press after completing the changes.
A holiday programme can be used to suspend the automatic programme for a period of
1 ... 45 days. Hold down the hkey throughout the entry procedure. Press
repeatedly, counting the number of holiday days individually.
After 45 (days) the display will revert to 0. The holiday programme will start at 00:00 on
the following day, and is indicated by H OFF.
Christmas holiday: 24 December to 2 January inclusive
Total days: 10 (Enter on 23 December)
Press hto display the stored or remaining number of holiday days. Simultaneously
press hand to extend the holiday programme, or to reset it to 0 to continue with
the automatic programme sequence.
These options can be carried out before or during the holiday period.
Press to toggle between ON and OFF.
This manual operation will be overridden by the next programmed switching sequence.
This facility is not available during a holiday period.
Press and msimultaneously to set automatic operation to "Permanent ON" or
"Permanent OFF". This continuous control function is indicated by a bullet symbol above
the ON or OFF indicator in the display and may be initiated during a holiday period 1).
Note that in this case, whichever permanent state has been invoked will
remain in operation after expiry of the holiday period.
To change or exit from a permanent state hold down the m key and press
repeatedly to toggle between the states "Permanent ON", "Permanent OFF" and "Auto"
(bullet disappears).
+ 1 hour: press d+ hsimultaneously
– 1 hour: press d+ msimultaneously
+ = Press
simultaneously
/ = Press
consecutively
d + m + + = Reset / clear
+ d / h / m = Set clock (day and time)
+ h / m = Set clock (time only)
= Clock operation
d + h = + 1h (summer time)
d + m = - 1h (winter time)
Prog / d / / h / m = Programme / Correction
Prog / h + m = Delete programme
h + = Holiday (max. 45 days)
m + = Mode selection: On / Off / Auto
Daily programme
Recall
Changing or clearing
a command
Holiday programme
Example 2
Recalling / changing /
clearing
a holiday programme
Override
Permanent control
Daylight savings
change-over
Summary

CA2N5241E / 11.1998 Siemens Building Technologies
4/4 Landis & Staefa Division
Supply voltage Extra low voltage (SELV)
AC 24 V, 50 ... 60 Hz
– Max. voltage tolerance +15 / –10 %
Power consumption Approx. 1 VA
Primary fuse None
Relay contact Change-over contact, SPDT, AC 230 V
– Contact rating Max. 5 A inductive
Max. 2 A capacitive, cos  > 0.4
– Voltage to earth Max. AC 250 V
Time basis Quartz
Memory locations 8 for 7-day clock, with grouping into blocks
12 for 24-hour clock
Min. time between switching operations 1 minute
Power reserve 72 hours, after 100 hours of operation
Accuracy ± 1 s / day at 20 °C
Display 9 mm LCD
Maintenance None required
Connection terminals For max. 2.5 mm2 wire
Weight including packaging 0.25 kg
Dimensions (W x H x D) 54 x 123 x 55 mm, see also drawing "Dimensions"
Usage Built-in unit for control panel mounting
Ambient temperature
– Operation 0 ... 50 °C
– Storage -25 ... 70 °C
Ambient humidity 10 ... 90 %rh without condensation
Snap-mounted on DIN rail (EN50022-35 x 7.5)
or screwed to a flat surface
Product safety EN60730
– Overvoltage category I I
– Contamination level 2
Electrical safety SELV-E (PELV to IEC364-4-1)
Function Type 1B to EN60730
Conformity Meets the requirements for CE marking
40566
1
2
0
L
N
72
73
71
Power supply AC 24 V
SPDT AC 230 V, 5(2) A
Caution:
Observe the technical data for the
switching contacts: AC 230 V, 5(2) A
All dimensions in mm
40565
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118 109
5
54
416,5
123
mhd
Prog.
55
N
1
L
2
AC24
72 7371
1
Technical data
Power supply
Signal output
Time switch
Connections
Weight, dimensions
Ambient conditions
Mounting
Safety
Terminal layout
Dimensions
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1998 Siemens Building Technologies Ltd.