1. A managing device for cooling an inverter device, comprising:a fan controller configured to provide an electric current of a cooling fan; and
a controller configured to determine whether the current flowing in the cooling fan is out of a preset range, and, when the current is out of the preset range, configured to control the cooling fan with a control voltage different from an operating voltage of the cooling fan,
wherein, when the current is out of the preset range even though the cooling fan is operated by the control voltage, the controller interrupts an operation of the inverter,
wherein the controller includes a manipulator configured to receive the current flowing in the cooling fan and output a signal related to the control voltage; and
a switched-mode power supply connected to both ends of a capacitor provided on a direct current (DC) link, configured to receive the signal related to the control voltage from the manipulator, generate the control voltage corresponding to the received signal, and provide the control voltage to the fan controller.