Astronomic time register 4-700/1
Astronomic time register 4-700/1

The problem preface and the paper aim

 One of the basic methods of energy saving is the usage of light adapters. For organization of au-tomatic control of lighting in places where light is required only in dark period of day, devices which switch on and off the lamplight depending on the size of natural lighting of the object are widely used. Such devices are called photosensitive devices. They have a sensor of luminosity which controls natural lighting.

However lately instead of photosensitive devices astronomic time registers which provide switching the loading on and off according to the time of sunrise and sunset are more frequently used. Volatile memory contains this information.

In comparison with photosensitive devices astronomic time registers have such advantages:
  • they do not require the usage of light adapter and its further recalibration measurement in case of its properties in due course;
  • there is no need in constant servicing of the sensor observation space;

 Today the market offers astronomic timers of high functionality by firms Legrand, Orbis. Their cost makes from 450 to 1200 hrn.

Applying new approaches and modern elemental base, we succeeded to work out specialized as-tronomic time register AT4-700/1 on 4 channels total cost of which is 600 hrn, which makes corre-spondingly 150 hrn per channel. High functionality of astronomic timer does not yield to photosen-sitive devices but their essential features are reliable functioning and operating costs.

Application domain

Astronomic time register AT4-700/1 (Fig.1) is intended for switching on the lighting in the night-time and can be used for illumination control of entrances, streets, advertisements, and also with purpose of temper prevention.

The principle of work of astronomic time register is based on switching the loading on and off in accordance with astronomic events (sunrise and sunset).

Microprocessor of astronomic timer contains everyday information about the time of sunrise and sunset.The transitional period (twilights) is also taken into account, when lighting is switched on one hour before sunset and switched off one hour after sunrise.The timer automatically takes into account daylight-saving.

Nonvolatile microprocessor memory is provided by a lithium battery.

Technical characteristics of astronomic time register are presented in Table 1.

Table 1. Technical characteristics of astronomic time register 4-700/1

Operating supply voltage, frequency

220 V, 50 Hz

Number of channels


Ultimate output of loading

4×700 VA

Self consumption of electric energy

1,2 W

Environment temperature

–10 °   +40 °

Discreteness of time set

1 min

Lithium battery replacement time

5 years

Exactness of clock motion

±3 min./year

Overall sizes

260×225×42 mm


220 gr.

The timer has protection from exceeding the power of loading that allows tamper prevention. As soon as the loading of timer will exceed the intended power delivery becomes automatically discon-nected until loading is not normalized.

Astronomic time register AT4-700/1 provides operation with any combination of phases that al-lows distributing the loading equally on phases.

If there's necessity of connecting to the timer more powerful loading, it is required to realize by means of contractor starters.

To prove the efficiency of astronomic time register application the calculation of economic indi-cators for the usage of timer in the mode of automatic lighting of entrance of the apartment building is conducted.

Calculation of economic indicators

The parameters of nine-storied building entrance are considered to be the initial date, that is:
  • the incandescent 60 W power lamps (this power is assigned by technical requirement for the lamp and by sanitary norms for entrance lighting);
  • energy saving almost in twice on average as compared to continuous lighting of the entrance;
  • power rate is 0,25 hrn/kW-h.;
  • one time costs (production/installation) makes 620 hrn.

Taking into account some vagueness concerning the number of lamps used in the entrance for its lighting, the calculations of economic indicators of astronomic time register in cases with 3, 5 and 9 lamps applied are suggested.

Calculations are presented in Table 2.

Table 2. Calculations of economic criteria of astronomic time register 4-700/1

The number of lamps in the entrance.




Energy saving in the entrance for a month, kW/h.




Benefits from one entrance in a month, hrn.




Payback time of astronomic time register, month




Actual economic criteria of astronomic time register AT4-700/1 are higher due to the advantage of tamper prevention.

New system of entrance lighting which applies automatic timer AT4-700/1 depending on the number of lamps used in the entrance, will be recompensed in the period from 3 to 10 months and in future will give the monthly economy of electric power from 194,4N { kW/h.} to 64,8N { kW/h.}, (where N is the number of lamps).

Advantages of application of astronomic time registers for automatic control of lighting are pre-sented in the article.The basic parameters of astronomic timer AT4-700/1 are sug-gested in the paper. Its financial efficiency is substantiated.
Aleksandr Sheremeta
inventor, assignee,
Ph.D., Associate Professor
mobile phone +38-097-260-61-97