2-channel astronomical digital timer D22 astro 412657

Advanced lighting control system with astronomical function

The D22 astro astronomical digital timer is a professional solution for automatic outdoor lighting control. The device utilizes an astronomical function to precisely switch lighting on and off according to natural solar cycles.

Precise dual-channel control with advanced features

The system offers two independent channels with 56 switching programs (28 for each channel), allowing for comprehensive management of different lighting circuits. The astronomical function automatically adjusts on/off times to local sunrise and sunset times throughout the year.

The device ensures exceptional accuracy of ±0.1 seconds per day, controlled by a precision quartz and synchronized with the power grid frequency. An autonomy of 5 years guarantees reliable operation even during power outages.

Comprehensive programming and operating capabilities

The timer offers a rich set of programming functions: weekly, yearly, holiday, random, and cyclic programs. The holiday function allows for automatic schedule adjustment during public holidays. The random program simulates occupancy by switching lights at random intervals.

Operation is intuitive thanks to prompt displays and the possibility of external programming. The user can create schedules directly on the device or use a computer with the dedicated AlphaSoft software.

Installation and operating characteristics

The device is mounted on a standard DIN rail, occupying only 2 modules (width 35.6mm). The compact design (83×35.6×60mm) allows for installation even in tight electrical enclosures.

The timer is equipped with potential-free changeover contacts (NO/NC) with a load capacity of 16A at 250V AC, enabling safe control of high-power receivers. The shortest switching time is 0.01666 seconds, ensuring a fast response to program changes.

The device is powered by 230V AC at a frequency of 50-60Hz. Backup power is provided by a CR2477 lithium battery weighing 11g, which maintains program memory for up to 5 years.

The system automatically adjusts to daylight saving time and winter time changes, eliminating the need for manual correction. A built-in hour meter enables monitoring of the operating time of individual circuits.

The IP20 protection rating guarantees safe operation inside electrical enclosures. Connections are made using robust screw terminals, ensuring durable electrical connections.