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two motors for sequential starting circuit

2016-09-04 16:17  
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two motors for sequential starting circuit
Some production machines have two or more electric motors, because these motor play different roles in the circuit. Sometimes, a certain sequence must be conformed to start in order, thus ensuring the normal production. The used circuit is shown in the figure. Take the two electric motors M1 and M2 used here for example. When the ST1 is pressed, KM1 coil is energized. And the coil’s main contacts and auxiliary contacts take action. And the motor M1 launches to be self-locked. It is obvious that KM1’s closure contact would not be self-locked if the ST2 is pressed firstly rather than the motor M1 (that is the ST1). Beside, KM2 coil would be in power shortage and be not able to start the motor M2.