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motor running with emitting sound and light signals circuit

2016-09-02 03:56  
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motor running with emitting sound and light signals circuit
As for some heavy equipment, there is a wide moving range for dragging mechanical components by motor. If there is no audible signal prior to the actual starting, it is likely to cause casualties. Circuit shown is designed to solve this problem. During the starting process, the ST is pressed to coil the contactor 2KM. Then, the bell HA and signal light HL are both driven to give driving signals, aiming to urge people to get out immediately. At the same time, electrical time relay 1KT is energized to work and the timing process starts. After about 1 minute (with adjustable time), 1KT’s normally opening contact closes to induct 1KM. And 1KM is self-locked to start the motor M.