# How Does a PLC Control a VFD and AC Motor? Complete Wiring Diagram

**URL:** <https://forumautomation.com/t/how-does-a-plc-control-a-vfd-and-ac-motor-complete-wiring-diagram/14150>\
**Category:** Electrical\
**Tags:** plc\
**Created:** [June 5, 2026, 9:07am UTC](https://forumautomation.com/t/how-does-a-plc-control-a-vfd-and-ac-motor-complete-wiring-diagram/14150 "2026-06-05T09:07:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [June 5, 2026, 9:07am UTC](https://forumautomation.com/t/how-does-a-plc-control-a-vfd-and-ac-motor-complete-wiring-diagram/14150/1 "2026-06-05T09:07:57Z")

</div>

## Basic Industrial Automation Concept of PLC & VFD Motor Control

In this system, the PLC controls the motor through a VFD (Inverter), providing Start/Stop and Forward/Reverse operation.

## Inside the PLC program

- Latching logic keeps the motor running after pressing the Start button.

- A status signal activates the Run indicator lamp.

- The speed reference is scaled and transmitted to the VFD.

- Forward and Reverse commands are managed safely through PLC logic.

 ![file_00000000e11c71fa88609e477fcba77d](https://cdn.forumautomation.com/original/2X/4/4ceb2982a997e24c7c09ecfd461845be4df2c0f7.jpeg)

## Process Flow

1. PLC reads push-button inputs.

2. PLC processes the control logic.

3. Commands are sent to the VFD.

4. The VFD controls motor speed and direction.

## In summary

The PLC acts as the controller, while the VFD regulates the motor speed and rotation direction, ensuring efficient and reliable motor operation.