The device, made by shown in the figure to the scheme, you can use any electronic clock on the chip CIC, for example, collected from the set "Start-7176" [1], activate at a specified time or three phase electric motor another powerful load.
The clock is connected to the starter motor (separated in the diagram, the dash-dotted line) flexible three-wire cable to connect which on the case and starter can be installed not shown in the diagram connectors. Electrical safety provided that the circuit associated with the network that is isolated from low voltage circuits electronic clock and connected only with the contacts of the relay K1.1 button and SB2.
In the initial state, the transistor VT1 is closed, relay coil K1 and starter KM1 de-energized. Acting according to the instructions for your watch, write in register their desired timer shutter speed, and then briefly press button SB2. One group of contacts duplicates the start button of the timer, the second closes the supply circuit of the winding of the contactor KM1. Thanks to a specially provided in the starter interlock contacts it will remain triggered, and engine - enabled and after the button is released.
After a predetermined amount of time at some time, opens the internal field transistor circuits CIC, the channel which connects its findings 24 and 27. This will open the transistor VT1 and will relay K1, widening the contacts K1.1. The circuit of the winding of the contactor KM1 is broken, and it Rusakovskaya contact will shut down the engine. If necessary, the off-signal of the engine can submit manually using the button SB3 without waiting for the shutter speed.
C by pressing the button SB2 scoreboard clock loops back to set the shutter speed and the engine will turn on again. If you want to change the shutter speed without waiting the end of the current, it is necessary to reset the timer using the button SB 1 [2].
Transistor VT1 is a high power structure of the n-p-n with h21e and more than 100 Artist max not less than 30 V. the Diode VD1 is chosen with a reverse voltage of at least 30 V. the Relay K1 - RAS (passport RF4.523.023-00) trip current of 19 mA and the resistance winding 650 Ohms. It can be replaced with an operating voltage of 24...27 V, capable of switching AC voltage of 220 V at a current up to 0.1 A
The proposed device for many years, works flawlessly.
Literature
Author: V. Serbin, Stavropol