Inverter device

An inverter device comprising:

• an inverter main circuit to which a load is connectable;
• an input unit which is configured to receive an input operation by a user;
• a connector into which a hot-pluggable external storage device is insertable;
• and
• a control unit which is configured to control writing of a log to the external storage device inserted in the connector, the log being pertinent to operating conditions of the load,
• wherein when the external storage device is inserted in the connector, the control unit switches the external storage device to a connected state in which the log is allowed to be written to the external storage device, and when the input unit receives the input operation during the connected state of the external storage device, the control unit stops writing of the log to the external storage device and switches the external storage device to a disconnected state in which the external storage device is removable from the connector.