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我厂中频感应加热熔炼电炉输出频率1000Hz,输出功率100kW,并联逆变电路,撞击式硬起动。其故障大多数出现在逆变部分。【例1】 1.故障现象:小功率运行时,各仪表指示及运行声音均正常。增大中频输出功率时,设备“啃”了一声,过电流指示灯亮,保护动作。抽出逆变触发板,检查整流输出的直流电压波形正常,逆变触发脉冲波形也正常。再起动逆变,打算进一步检查小功率时逆变管的动态管压降等,在直流电压不到300V、直流电
I plant induction heating melting furnace output frequency of 1000Hz, the output power of 100kW, parallel inverter circuit, the impact of hard-started. Most of its failure in the inverter part. 【Example 1】 1. Symptom: During low-power operation, all instrumentation and operation sounds are normal. Increase the IF output power, the device “bite ” a cry, over-current indicator light, protection action. Remove the inverter trigger board, check the rectified output DC voltage waveform is normal, the inverter trigger pulse waveform is normal. And then start the inverter, intend to further check the low power when the dynamic tube pressure drop tube, etc., in DC voltage less than 300V, DC