Every time the equipment is installed, it will be debugged carefully.

Fault phenomenon: It is difficult to start. After starting, the intermediate frequency voltage is more than twice the DC voltage, and the DC current is too large. Analysis: a. The IGBT is damaged in the inverter circuit; b. The inverter thyristor has a non-conducting, that is, “three legs“ work; c. The IF signal sampling loop has an open circuit or a polarity error phenomenon; d. The inverter leads the front angle phase shifting circuit to malfunction;