Motor protector circuit diagram 16

Published:2011/5/20 21:04:00 Author:Lucas | Keyword: Motor protector | From:SeekIC

The motor protector circuit is composed of the AC contactors KM1 ~ KM3, knife switches Q1, Q2 and motor M, the circuit is shown as the chart. When 380V AC supply voltage is normal, the AC contactors KM1 ~ KM3 get power and pull in, their 3 groups of normally open contacts are connected, then closing the knife switch Q2 will make motor M get power and operate. When the AC 380V voltage is open-phase because of thunder or other reasons, one contactor of KM1 ~ KM3 couldn't pull in or get power, the power supply circuit of motor M will cut off to protect the motor M. For example, the voltage on L2 phase line disappears, AC contactor KM2 releases, the normally open contacts KM2-1 ~ KM2-3 cut off. KM1 ~ KM3 select the 220V AC voltage contactor.



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