When running an industrial machine that requires three-phase power, a three-phase Variable Frequency Drive (VFD) is the perfect solution. But what happens if you only have single-phase power available to you? How do you use a VFD designed for three-phase power on single-phase? The answer is yes, it is possible to use a three-phase VFD on single-phase power but it must be done with caution.
In order to use a three-phase VFD on single-phase power, the first step is to make sure the VFD has a single-phase input rating. Most modern VFDs are capable of taking either single- or three-phase inputs, though a few will need to be specially modified or rewired. Once the correct wiring is confirmed, connecting the VFD to the single-phase power is a simple process. The three-phase VFD will then use the single-phase power to generate the three-phase output required to run your machine.
Though three-phase VFDs are highly efficient and reliable when used on three-phase power, their efficiency can be drastically reduced with single-phase power. As such, when using a three-phase motor on single-phase power, it is important to pay close attention to prevent overloading the VFD. To avoid this, the speed of the motor should be no more than 70% of its nominal operating speed. Additionally, it is important to check the temperature of the VFD regularly, since single-phase operation causes the VFD to run hotter than it would with three-phase power. Taking these precautions will help to ensure the safe and effective use of a three-phase VFD on single-phase power.
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