Guide to Controlling a VFD Using HMI
The method of controlling a VFD through HMI is commonly applied in practical applications due to its numerous advantages, including multi-point connectivity, long-distance high-speed transmission, ease of implementation, and cost-effectiveness. This article will help you easily control a VFD using HMI.
HMI stands for Human Machine Interface, which is a device that serves as a communication interface between humans and machines. In the field of industrial manufacturing, HMI plays a crucial role in enabling operators to monitor and control machinery easily, thereby increasing work efficiency and quality.
Key advantages of HMI include:
- Touchscreen interface for user-friendly operation, similar to a smartphone.
- Program memory includes ROM, RAM, and EPROM..
- Programming software supports interface design tools, animations, functions, and control commands.
- Supports communication protocols such as Modbus, CANopen, Profinet, Profibus…
Currently, in the Vietnam market, there are many HMI manufacturers, including Siemens, Mitsubishi, Rockwell, Fuji, INVT, Delta, and more.
2. Communication Connection Diagram for Modbus between VFD and HMI
Connection diagram for INVT GD200A VFD and INVT VT HMI
3. Instructions for Setting up and Configuring Communication on HMI and VFD
3.1 VFD Configuration Parameters
|P14.00||Slave Address||Range: 1 – 127||1 (Default)|
0: No check (N,8,1) RTU
1: Even check (E,8,1) RTU
2: Odd check (O,8,1) RTU
3.2 HMI Configuration
Step 01: Open the HMI VT Designer interface design software
Step 02: Select the HMI VT model
Step 03: Choose the RS485 connection type and COM 1 communication port
Step 04: Configure Modbus RTU communication. Note: The communication configuration between HMI and VFD must be compatible.
4. Controlling the VFD Using HMI
Modbus communication parameters for controlling the VFD’s Forward/Reverse operation and setting frequency.
|Communication Function||Communication Address||Function||Read/Write|
|0001H: Forward Run||
|0002H: Reverse Run|
|0003H: Jog Forward|
|0004H: Jog Reverse|
|0006H: Freewheel Stop|
|0007H: Reset Fault|
|0008H: Jog Stop|
For more detailed instructions on how to control a VFD using HMI, please contact the toll-free hotline at 18006567 for quick support.