An electronic clock controls an electric motor. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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An electronic clock controls an electric motor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electric motors

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A device made according to the diagram shown in the figure can, using any electronic clock on the K145IK1901 chip, for example, assembled from the Start-7176 set [1], turn on a three-phase electric motor or other powerful load for a specified time.

An electronic clock controls an electric motor

The clock is connected to the motor starter (separated in the diagram by a dash-dotted line) with a flexible three-wire cable, for connecting which you can install connectors not shown in the diagram on the clock and starter cases. Electrical safety is ensured by the fact that the circuits connected to the network are isolated from the low-voltage circuits of the electronic clock and connected only to the contacts of the K1.1 relay and the SB2 button.

In the initial state, the transistor VT1 is closed, the windings of the relay K1 and the starter KM1 are de-energized. Acting in accordance with the operating instructions for the watch, they write the required shutter speed into the register of their timer, after which they briefly press the SB2 button. One group of its contacts duplicates the timer start button, the second closes the power supply circuit of the KM1 starter winding. Thanks to the blocking contacts specially provided in the starter, it will remain triggered, and the motor will remain on even after the button is released.

After a predetermined delay, the internal field-effect transistor of the K145IK1901 microcircuit opens for a while, the channel of which connects its outputs 24 and 27. As a result, the transistor VT1 will open and relay K1 will open, opening contacts K1.1. The winding circuit of the KM1 starter will be broken, and its open contacts will turn off the engine. If necessary, the signal to turn off the engine can also be given manually using the SB3 button, without waiting for the end of the shutter speed.

By pressing the SB2 button again, the clock display will again display the set shutter speed and the engine will turn on again. If you want to change the shutter speed without waiting for the end of the current one, reset the timer using the SB 1 [2] button.

Transistor VT1 - any average power structure np-p with h21e more than 100 and Uke max at least 30 V. Diode VD1 is selected with a reverse voltage of at least 30 V. Relay K1 - RES22 (passport RF4.523.023-00) with a trip current of 19 mA and a winding resistance of 650 ohms. It can be replaced by another with an operating voltage of 24 ... 27 V, capable of switching alternating voltage of 220 V at a current of up to 0,1 A

The proposed device has been working flawlessly for many years.

Literature

Georgiev K. Alarm clock from the set "Start 7176". - Radio, 1986, No. 6, p. 40-44.
Gubarev A. Another button in the watch on the BIS K145IK1901. - Radio, 1987, No. 5, p. 47.

Author: V. Serbin, Stavropol

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