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1.故障现象小电流(20A)引弧使用数分钟后突然变成大电流,焊机面板上的焊接电流调节旋钮不起作用(即电流调节失控)。 2.分析检修根据故障现象分析,可能是晶闸管电流调节器电路或ZXG7-300-1型弧焊整流器电路发生故障。首先检查晶闸管电流调节器电路板上所有元器件,均未发现异常。然后用500型万用表500mA档串接到电抗器绕组回路中进行焊接试验,结果是万用表指示约50mA,关断焊机总电源10s后再合闸,万用表指示为25mA,不久又升至50mA,如此循环不止。最
1. Symptom The small current (20A) suddenly turns into a large current after a few minutes of use, and the welding current adjustment knob on the welding machine panel does not work (that is, the current regulation is out of control). 2. Analysis and Maintenance According to the failure phenomenon analysis, the thyristor current regulator circuit or ZXG7-300-1 arc welding rectifier circuit failure. First check the thyristor current regulator circuit board all the components, no abnormalities were found. 500mA multimeter and then connected in series to the reactor windings loop welding test, the result is about 50mA multimeter instructions turn off the welder total power 10s and then closed, multimeter instructions for 25mA, and soon rose to 50mA, and so on Circulation more than. most