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The machine tool magnetic sucker low-current protection circ

2016-09-27 02:08  
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The machine tool magnetic sucker low-current protection circuit
The machine tool magnetic sucker low-current protection circuit
See as the circuit, the +24V is generated by stepping down the 110V power supply. When the touch spot JK of the magnetic sucker circuit is closed, the sucker is on and working, whose regulated current is 1.4A(the current of strong sucker is higher). At the moment, the sampling resistor which is serially connected in the electric sucker will have a 1.4v voltage drop, the dropped voltage is sampled by the potentiometer RP1 and imposed on the transistor VT1 input circuit, and then compound-magnified by VT1 and VT2. The multiple after being compounded by VT1 and VT2 is high.