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1故障现象我市污水处理厂进水泵房1台45 kW变频调速潜水泵(1号机M1)某日开机时,操作人员按下“运行”按钮后,变频器面板显示电流随着频率的上升也从零直线上升,在短短的几秒内升到约140A,且一直往上升,无法降下来。起动不成功,操作人员紧急停车报修。该机额定电流为86A,其控制原理图如图1所示。2原因分析维修人员到场后,检查变频器面板显示正常,无故障指示。首先,用旋具将各接线端子扭紧了一遍,用万用电表测量变频器“R、S、T”与“U、V、W”各端电压均正常,重起试机,故障依旧。用钳型电流表测
1 Symptom I sewage treatment plant inlet pump room 1 45 kW frequency control submersible pump (M1) on a day when the boot, the operator presses the “Run ” button, the inverter panel shows the current with the The rise in frequency also raced from zero to about 140A in just a few seconds, rising all the way up and unable to come down. Start unsuccessful, the operator emergency parking repair. The machine rated current of 86A, the control schematic shown in Figure 1. 2 Analysis of reasons After the maintenance staff arrived, check the inverter panel shows normal, no fault indication. First of all, with a screwdriver to tighten the terminals again, with a multimeter to measure the inverter “R, S, T ” and "U, V, W Machine, the fault still. Measured with a clamp-type ammeter