How many input(s) are required for operation in a 2-wire VFD control mode?

In a 2-wire VFD (Variable Frequency Drive) control mode, only one input is required to operate. This input typically functions as a start/stop control signal coming from a switch or a control relay. The distinctive feature of the 2-wire setup is that it allows for very simple control where the drive can determine whether to start or stop based solely on the state of this input.

In a 2-wire system, when the control input is energized, it signals the drive to start operating. When the input is de-energized, the drive will stop. This configuration is particularly advantageous in applications where simplicity and ease of wiring are priorities, as it requires fewer components and less complexity compared to other control modes that may require multiple inputs or additional wiring for different control functions.

By understanding this aspect, one can appreciate the efficiency and functionality of a 2-wire setup in controlling VFDs in various industrial applications.