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3PH (three phase) machinery is very common but 3PH power is generally not available except in industrial locations. Thus many small shop owner's use phase converters. The motor type such as the ARCO Roto-Phase with capacitors is quite common. These work OK for motor applications but electronics, even simple magnetic contactor control circuits should not be on the generated leg. The generated 3rd leg drops to very low voltage when a large motor is started and this will cause electronics to drop out including the starter on the motor being started. Identify that leg (I use a red wire) and keep control circuits off of it! - guru