Machine control circuit realizes the functions of water level detect, motor driven, water import and export, it consists of water level detector, motor, transmission system components and penstocks.

机械控制电路实现水位检测、电机驱动、进水、排水等功能，主要由水位检测器、电动机、传动系统部件、进水排水电磁阀组成。

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This paper introduces the automatic control circuit time in turn driven by inverter with the using and the reserved load and combined switch connection.

介绍变频器驱动一用一备负载的自动定时轮换控制电路及组合开关联接。

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