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Three-phase motor double speed 2Y / Y connection speed regul

2016-09-01 01:19  
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Three-phase motor double speed 2Y / Y connection speed regulation circuit
When you press the start button STL, the AC contactor KML gets electric, then the motor M is connected as Y; when you press STH, the AC contactors 1KMH and 2KMH get power to pull in, then the motor M is connected as 2Y to operate in high speed. STP is stop button for the machine.