What should I do if the medium frequency induction heating equipment cannot start normally?

We just received a call from a customer saying that he turned on and off the medium frequency induction heating equipment, but the equipment could not start normally and asked us what to do. In fact, this is a small problem and can be easily solved. Do you often encounter similar problems, and do you often worry about these glitches? Today, the editor will tell you what you should do.

(1) The fault phenomenon is that the DC current is large at startup, the DC voltage and intermediate frequency voltage are low, and the intermediate frequency annealing equipment emits a dull overcurrent protection sound. This may be caused by a short circuit or open circuit of the thyristor in one arm of the inverter bridge, causing the inverter bridge to When the arm bridge is running, use an oscilloscope to observe the voltage drop waveforms of the thyristors on the four arms of the inverter bridge. If the voltage drop of the thyristor on one arm is a straight line, the thyristor has broken down. If it is a sine wave , then the thyristor is normal.

(2) When starting, the DC current is large, the DC voltage is low, and the intermediate frequency voltage cannot be established normally. At this time, the compensation capacitor may be short-circuited. The capacitor must be disconnected, use a meter to find the short-circuited capacitor and replace it. 

This article briefly explains what to do if the medium frequency induction heating equipment cannot start normally. I hope it can help you.