摘  要：在变频器的运行模式中，外部运行模式是应用最广泛的运行模式。在外部运行模式下，频率给定方式有模拟量给定和数字量给定两种，其中数字量给定可以获得较高的频率精度、模拟量给定可以实现电机的无级调速。 关键词：外部运行模式；频率给定；模拟量给定；数字量给定 Abstract: In the operation mode of inverter, external operating mode is the most widely used operating mode. In external mode, there are two kinds of analog and digital given in the frequency given mode, in which the digital given [登陆后可查看全文]