FR-D740-2.2K-CHT is a model of Mitsubishi inverter. It is designed to control the speed of an electric motor by varying the frequency and voltage supplied to it. The "2.2K" in the model number represents the power rating of the inverter, which is 2.2 kilowatts. The "CHT" indicates that it belongs to the CHT series of Mitsubishi inverters. This inverter is commonly used in various industrial applications for motor control and energy-saving purposes.