In addition to selecting a VFDe that suits the requirements, the method of controlling the VFD will also affect the quality and efficiency of the machinery system operation

Method 1: Controlling the VFD with start/stop and speed adjustment through a keypad

Button	Name	Function
	Program key	Access parameter setting groups
	Data entry key	Enter or modify parameter settings
	Up key	Increase the value of parameter settings
	Down key	Decrease the value of parameter settings
	Shift key	Switch display parameters or quickly access the parameter group to be set
	Run key	Start the VFD using the keypad
	Stop key	Stop the VFD using the keypad
	Jog key	Function defined by parameter P07.02

Purpose of control:

• Start/stop the VFD via keypad or Terminal
• Adjust the frequency using increase/decrease keys or volume button on keypad

Setting Parameters

 Method 2: Multi-speed VFD Control

INVT VFDs allow the motor to run at 16 different speeds through 4 control signals on Terminal.

Multi-speed function is used based on the machinery’s technological requirements.

 Multi-speed control signal table

VFD Connection Diagram

Setting Parameters

Formula for converting percentage speed setting to operating frequency of the VFD:

Where:

• F: Operating frequency of the VFD
• P: Percentage speed setting
• 03: Upper frequency limit of the VFD

 Method 3: Controlling the VFD via Modbus Communication

• VFDs offer various methods for start/stop control and speed control, among which control through communication using Modbus protocol is possible.
• The Modbus communication protocol has two types, ASCII and RTU, and in a Modbus network, there can be one master and multiple slaves.
• In GD200A series, connection is established through two terminals, RS485+ and RS485-, so twisted pair cables should be used.

Wiring diagram

Purpose of control: Communication of start/stop commands and speed to the VFD

Setting Parameters

 Method 4: Controlling the VFD for start/stop and speed adjustment through an external potentiometer

Wiring diagram

Setting Parameters

For more detailed information, please contact the hotline at 18006567 (toll-free) for quick assistance.