isolate该如何翻译? relays are used to isolate one voltage level from another. 就字面意思,这句话是说:继电器用于隔离不同的电压等级。 relays are used to isolate one voltage level from another. a plc may be used to control the operation of a medium-voltage motor, perhaps 2,300v or 4,160v. a relay is used to energize the starter, which, in turn, switches the motor voltage while the plc controls the relay. wired to provide a control sequence, relays may also be used for simple control schemes where a plc would prove uneconomical. troubleshooting relays can be handled in short order, without having to return to the maintenance shop for the computer necessary to analyze the control sequence within the plc.查看更多