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DC motor start circuit controlled by the time relay

2016-09-01 15:43  
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DC motor start circuit controlled by the time relay
In fact, it is a resistor buck-start DC motor start circuit, but it uses time relay to control the shorted resistor. When the power switch QS is closed, pressing the start button ST can make the DC contactor 1KM be energized, the normally open contact is closed, then the armature loop is connected to R1 , R2. Time relay 1KT also starts at the same time, and its normally open contact 1KT is closed with a delay time, 3KM was energized to make R1 be shorted, then motor M accelerates.