• Time of issue:2021-09-02
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(Summary description)High frequency dithermic furnace equipment is operating normally and often penetrates compensation capacitance. IGBT medium frequency 300 kW induction heating equipment cause analysis: the reason of the problem is as follows. 1. High frequency working voltage and output power are too high. 2. Capacitor weapons are not well equipped. 3. In the capacitor rectifier circuit, the volume difference between the series capacitor and the series capacitor is too much, resulting in the uneven working voltage through the capacitor. When the DC current is large, the DC power supply can not be lowered and the high frequency working voltage can not be shaped normally. Analysis and solution: compensation capacitor short circuit fault. Broken capacitor - Search for short-circuit fault capacitor - Replace short-circuit fault capacitor. High dc current, low AC voltage and high frequency working voltage, equipment noise upset and start over current maintenance. Analysis solution: the inverter bridge has a bridge arm of the thyristor may short circuit failure or lead to the inverter bridge three arm bridge operation. A digital oscilloscope is used to separate and investigate the loss wave patterns of the thyristor on four arms of the inverter power supply bridge. If the loss wave patterns of the thyristor on one arm are one-line, the thyristor has been disconnected; if it is sinusoidal, the thyristor has not been disconnected, replace the thyristor that has been disconnected, and search for the reason of the thyristor not being disconnected. After a period of normal operation of high frequency dithermic furnace equipment, abnormal sound was found. IGBT medium frequency 350 kW induction heating equipment meter read that shaking equipment was unstable in work. Analysis and solution: it is mainly caused by the poor thermal characteristics of electrical equipment of high-frequency dithermic furnace equipment. Part of the electrical equipment of the equipment can be divided into weak current installation and weak current two parts, and separated for inspection. First part inspection control, but beware of destruction of main power supply circuit output power equipment, in the absence of a closed the main power master switch, the only part of the access control switch power supply, to control part of the work after a period of time, use digital oscilloscope test control board open a single pulse, see open single pulse is normal.