How to Control a Split Phase Motor with VFD?

Variable frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The VFD adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation.

What should you do if the pump motor you have is 230V or 240V? We have a great solution - ATO 120V single-phase to 1-phase/3-phase 230V VFD. So, how to use VFD to control the motor? Next, we choose the model GK3000-SP1S1-d75 of ATO high quality VFD and split phase motor as examples to show you how to control the split motor with VFD and makes the motor rotate.

The use of this VFD is similar to that of other voltage VFDs. The steps are to set the control mode > set the frequency > set the motor parameters. This time we will demonstrate how to control the start and stop of the VFD with external terminals. When using the VFD terminal to control the mortor start and stop, DI1~DI6 and COM ports are used. We willl take the use of DI1~DI3 for example.

The button switch K1 controls the forward rotation of the motor, K2 is the pause button, and K3 is the stop button.

Step 1: VFD parameters setting

• F0-02=1 (Terminal Control)
• F4-00=1 (DI1 Forward Run)
• F4-01=10 (DI2 Run Pause)
• F4-02=8 (DI3 Free Stop)
• F0-11=0 (Source of Frequency by F0-12)

Step 2: VFD running testing

1. Press K1, the motor runs at the target frequency set by F0-12, press K2, the motor decelerates and stops running.
2. When K2 is restored, the motor accelerates and returns to normal operation.
3. Press K3, the motor stops running, and when K3 is restored, the motor is still in the stopped state.
4. Restore K1, the motor can run again after K1 is pressed again.

Note: If K1 is interrupted, the motor will also decelerate and stop.

In addition, you can watch the video below to see more details of setting and testing control split phase motor with VFD.