Lighting control by electromechanical time relay 24 hours. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Lighting control by electromechanical time relay 24 hours. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting. Control schemes

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At nighttime, the question often arises of automated control of outdoor lighting, such as the illumination of building facades, advertising of offices, shops, entertainment venues, fence perimeters, etc.

There are several ways to solve this issue

Manual control, there are often delays in switching on or vice versa, depending on the mode of operation of the maintenance personnel.
Control using a photorelay, the difficulty in installing the sensitive element of the circuit in urban conditions, sometimes it is necessary to raise it to the highest point of the building, where the influence of the night lighting of neighboring buildings is the least.
Control by electromechanical time switch 24 hours, easy to assemble and maintain, periodic adjustment of the on and off times is necessary.

The need to adjust the time occurs no more than twice a month.

Lighting control by electromechanical time relay 24 hours
Rice. 1. 24 hours time relay lighting control circuit

The installation scheme consists of an electromechanical time relay for 24 hours, a manual and automatic control switch, a controlled contactor and a power supply.

Auto mode

When the time relay is turned on in the specified range, power through the closed contacts of the time relay and the manual and automatic mode switch is supplied to the contactor coil, which closes the power contacts through which the coils of power magnetic starters can be powered.

Manual mode

If it is necessary to turn on the contactor outside the time relay mode, it is enough to switch the switch to manual control and power will be supplied to the contactor coil

Lighting control by electromechanical time relay 24 hours
Rice. 2. Appearance of the relay

Publication: electro.narod.ru

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Comments on the article:

Dmitriy
It is not clear which position corresponds to manual and automatic mode? I have a contactor. to 1, and in other modes it does not turn on.

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