Importance

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Abstract

Disclosed is a method of diagnosing inverter trouble capable of improving convenience of use and safety of the user by notifying the user of the error of switching devices used for outputting AC voltage of the inverter and the earth fault of an output of the inverter when applying power to the inverter. The method includes the steps of determining whether or not each of switching devices has a fault by sequentially switching on the switching devices when an inverter is initialize by receiving power, recording sorts and fault states of the switching devices having the fault, detecting whether or not an earth fault occurs by outputting each phase voltage of the inverter, recording phases having the earth fault and an earth fault state thereof, determining the inverter trouble with reference to a fault record of the switching devices and an earth fault record, and waiting for a normal operation if the inverter has no trouble, and waiting for an order of a user if the inverter trouble occurs while displaying the inverter trouble.

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First Claim