Elko SHT-4, Manual

Page: 60 / 196

- 4-
Characteristics
The SHT-4 astronomic timer is used for the automatic real-time
controlling of appliances. The timer operates all year round without
the need of continuous maintenance, with minimum operating costs
and maximum savings of electrical energy. (For example for turning
on heating, pumps, ventilators, public lighting etc.). Appliances can
be controlled in regular time cycles or based on a pre-set programme.
The astronomic timer does not include any optical sensors or other
external equipment. After installation, it requires no special operation
or maintenance. In the case of a power supply interruption, the timer
retains all set values required for its reliable activation after power
is restored. The operation of the astronomic timer is based on the
variations in the sunset and sunrise times throughout the year. Based
on the current date (internal real-time clock), it automatically modifi es
the times for turning on or off e.g. public lighting. Time updates are
resolved automatically for every day of the year. Using the Off set
function, it is possible to modify the times for switching on or off by ±
120 minutes. The off set is fi xed, i.e. the same for both channels each day.
- The 2-channel design (with the option of assigning separate
programmes and modes to each channel) allows controlling two
independent circuits.
- Switching modes:
-
Auto
– automatic switching mode:
-
Programme
– switching based on a programme (astro or time).
-
Random
– switches randomly in a 10–120 minute interval.
-
Holiday

– holiday mode – option of setting up a period for
which the timer will be blocked, i.e. will not switch based on the set
programmes.
-
Manual
– manual mode – option of controlling the individual
output relays manually
- Options of the automatic switching programme:
-
Astro
– switches based on the time of sunset/sunrise calculated
from input date and geographical location.
This time can be corrected ± 2 hours.
-
Time programme
– switching based on a pre-set time programme
- Memory capacity for 100 time programmes (common for both
channels).
- Programming can be performed both when power is on or in
backup
mode.
- Output relays only operate with a supply voltage of AC 230 V.
- Menu display selection – CZ / SK / EN / RO / PL / HU / RU (default
factory setting EN).
- Selection of automatic switching between summer / winter time
based on location.
- Setting the geographic location (selection from predefi ned options).
- Exact calculation of sunrise and sunset by entering the date, time, )
latitude and longitude and time zone.
- Backlit LCD display.
- Simple and easy setup using 4 control buttons.
- Sealable transparent cover on the front panel.
- The timer has a backup battery that preserves data in case of a
power supply failure (reserve backup time up to 3 years).
- Supply voltage: AC 230 V.
- 2-module, mounted onto a DIN rail, clamping terminals.
- After plugging the timer in for the fi rst time, the current time, date
and geographic location must be set for correct operation of the
astronomical clock.