There are several ways to convert single-phase power to three-phase power. A phase converter is a device used to run three-phase equipment from a single-phase power supply.

There are three main types of phase converters:

• Rotary Phase Converters: Most widely used and dependable, these converters vary by manufacturer. Phoenix Phase Converters and CNC-rated phase converters are highly recommended.
• Static Phase Converters: Also known as DPS converters, these simply use a start capacitor and a relay to start a load motor. They don't generate true three-phase power.
• Digital Phase Converters (VFD): These converters offer balanced three-phase power but tend to be more costly and less durable. They also require electronic filters to remove DC leakage from the AC output lines.

If you have small equipment like a hobbyist saw or drill press, a static phase converter will suffice, although you'll lose about a third of the motor's rated horsepower. For tougher loads like lathes or CNC machines, a rotary phase converter is required. Digital phase converters are great for clean power environments, such as in medical settings or quiet environments like a dentist's office.

A static phase converter can run multiple machines, but only within its rated horsepower range. A rotary phase converter is ideal for running multiple machines simultaneously and can handle heavier loads with balanced voltage.

Light-duty phase converters are typically built with rolled steel and open vents, which can let in dust and moisture, leading to eventual motor failure. Heavy-duty phase converters, like Phoenix Phase Converters, are sealed and use durable, weather-resistant enclosures, making them more reliable and suitable for harsh environments.

While some converters are easy to install, it's always recommended to have a licensed industrial electrician handle the installation to ensure it meets local and state codes.

With rotary and digital phase converters, no power is lost to the load motor. However, with a static phase converter, you will lose about one-third of the rated horsepower.

Yes, as long as the phase converter is rated for outdoor use, such as with a NEMA 3 or NEMA 4 electrical panel enclosure and a totally enclosed fan-cooled (TEFC) idler motor.

Yes, CNC machines can use phase converters, but only CNC-grade phase converters such as Phoenix Phase Converters, which offer balanced voltage and are designed specifically for CNC equipment.

Yes, welders are resistive loads and can be powered by a phase converter. It's important to have 1 horsepower for every amp of load to maintain a balanced voltage.

Yes, rotary and digital phase converters are compatible with VFDs. However, a rotary phase converter is generally preferred for VFDs due to its balanced output.

Rotary phase converters require very little maintenance, especially heavy-duty models (TEFC). Light-duty models (ODP) may need periodic cleaning and bearing replacement. Static phase converters and digital phase converters require minimal or no maintenance.

Noises from a rotary phase converter could indicate electrical issues, such as a blown capacitor or an incorrectly wired motor. Mechanical noises could be due to fan issues or obstructions. It's best to consult the manufacturer for troubleshooting.

Ensure you have the right phase converter for your application and check if the converter is properly sized. Also, check the power supply and the voltage produced by the converter to ensure it is within the required range.