Diagnostic device for power supply device for electric discharge machine

A diagnostic device for a power supply device for an electric discharge machine which applies a pulsed voltage to a discharge gap constituted by a workpiece and an electrode which face each other with a predetermined gap in order to perform electrical discharge machining on the workpiece with the electric discharge machine, the diagnostic device comprising:

• a first contact which is capable of establishing conduction with one side of the power supply device for the electric discharge machine via a conductive part of the electric discharge machine,
• a second contact which is capable of establishing conduction with the other side of the power supply device for the electric discharge machine via a conductive part of a table on which the workpiece is arranged, and which can be brought into contact with or separated from the first contact,
• a simulated current generation unit which is connected in series to the power supply device for the electric discharge machine in a state in which the first contact and the second contact are in contact with each other and which generates a simulated current for simulating current caused by dielectric breakdown of the discharge gap based on the applied pulsed voltage of the power supply device for the electric discharge machine, and
• a judgment unit which detects the simulated current and judges presence or absence of an abnormality in the power supply device for the electric discharge machine based on the simulated current.