△-shaped three-phase motor buck starting circuit

Published:2011/7/10 3:07:00 Author:Lucas | Keyword: three-phase motor | From:SeekIC

The start button ST is pressed to drive the 1KM coil to gain electricity and to be self-protected. At the same time, 3KM relay coil KT gains electricity and motor’s windings are connected to form a extending triangle for buck starting. When the Kt's tuning time reaches, the delaying normally closed contacts disconnect. Then the 3KM coil releases with the loss of power and its normally closed auxiliary contact is closed. Meanwhile, KT’s delaying closing normally opened contacts are closed. The 2KM coil gains electricity to suction and to be self-locked. 3KM’s main contact releases while 2KM’s main contact closes. Then the motor windings are transferred from extending triangle shape into a triangle connection. The starting process is over and the operation is on.



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