有电脑、继电器两种控制方式，设有手动、半自动两种操作方式。
PLC or Relay control with optional operation of manual and semi-auto.
当电流超过限制值时，过负荷电流继电器自动保护振荡管和整流器，同时可以避免由不当操作所引起的频率漂移。
The over-current relay works to protect oscillation tubes and rectifier, when the current exceeds its limits. Frequency deviation caused by faulty operation is also prevented.
本系列液压机具有继电器控制PLC控制俩种电气控制系统，有调整、手动及半自动三种操作方式。
The hydraulic machines are equipped with two electric control systems-relay and PLC, and three operation modes-mechanic, manual and semi-automatic.
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