Patent ID: 7545655

Claim:
An inverter apparatus comprising: an inverter main body; a built-in option connected in the inverter main body; a parameter unit connected to the inverter main body from outside; a control power source adapted to generate power from a commercial power supply voltage and is connected to a microcomputer or a peripheral circuit included in at least one of the inverter main body, the built-in option, and the parameter unit; at least a first external-power-unit connector via which a first external power unit can be connected to at least one of the inverter main body, the built-in option, and the parameter unit, wherein the first external power unit connected to the first external-power-unit connector is configured to function as a first power source that controls the microcomputer or the peripheral circuit included in at least one of the inverter main body, the built-in option, and the parameter unit; and optionally, a second external-power-unit connector, separate from the first external-power-unit connector, via which a second external power unit, separate from the first external power unit, can be connected to at least one of the inverter main body, the built-in option, and the parameter unit, wherein the second external power unit connected to the second external-power-unit connector is configured to function as a second power source that controls the microcomputer or the peripheral circuit included in at least one of the inverter main body, the built-in option, and the parameter unit.