Patent ID: 7947917

Claim:
A wire-cut electric discharge machine having a water supplying unit for supplying a machining liquid to a machining tank, a draining unit for draining the machining liquid from the machining tank, a detecting unit for detecting a water level of the machining liquid stored in the machining tank, and a water level adjusting mechanism for supplying or draining the machining liquid based on a detection value detected by the water level detecting unit so as to adjust the water level of the machining tank, said machine having a water level abnormality detection function for generating a water level abnormality alarm when a difference between the water level detected by the water level detecting unit and a target water level exceeds a predetermined range, the wire-cut electric discharge machine comprising: an outputting unit for stopping the supply of the machining liquid to the machining tank so as to output a drain instruction when the alarm is generated; a displaying unit for displaying questions to an operator about (i) a change in the water level after the alarm is generated, and ii) a state of the water level adjusting mechanism; an inputting unit for inputting an answer to the question displayed on the displaying unit; and a cause specifying unit for specifying, from the answer input by means of the inputting unit, a part which causes the generation of the alarm.