A frequency converter includes a housing, a frequency conversion component installed in the housing, a controller that controls the frequency conversion component, and a user interface that transmits control commands from a user to the controller. The controller of the frequency converter are provided with a load examination function that examines whether a load is connected to an output of the frequency conversion component, the controller raising an output frequency of the frequency conversion component to a desired value in response to a load connected to the frequency conversion component and detected by the load examination function.